op-amps, video amplifiers, high-speed comparators, and many other analog-based circuits. MOSFET differential amplifiers are used in integrated circuits, such as operational amplifiers, they provide a high input impedance for the input terminals. A properly designed differential amplifier with its current-mirrorBJT Differential Amplifier. Look under the hood of most op amps, comparators or audio amplifiers, and you'll discover this powerful front-end circuit - the differential amplifier. A simple circuit able to amplify small signals applied between its two inputs, yet reject noise signals common to both inputs. This circuit has a unique topology: two ...Learn how to calculate the Differential Output Resistance of BJT Differential Amplifier. We are ignoring Early Effect.The Lecture has been recorded by Hamza ...K. Webb ECE 322 6 BJT Amplifier Biasing To function as an amplifier, a transistor must be biased in the forward-active region DC operating point set by the bias network Resistors and power supply voltages Sets the transistor's DC terminal voltages and currents - its DC bias How a transistor is biased determines: Small-signal characteristicsSave. Terminals 1 and 2 are almost equally large (76,000 m2 & 66,000 m2). T1 serves both international & domestic flights, while T2 serves only international flights (RAM & some code-share). There are restaurants, fast food places and shops in both terminals. You can pay by card everywhere.The d.c. analysis means to obtain the operating point values i.e. I Cq and V CEQ for the transistors used. The supply voltages are d.c. while the input signals are a.c., so d.c equivalent circuit can be obtained simply by reducing the input a.c. signals to zero. The d.c. equivalent circuit thus obtained is shown in the Fig.. Dec 12, 2020 · I am working my way through the Art of Electronics and I have today studied the differential amplifier. I aam having issues with Exercise 2.18: Design a differential amplifier to run from ±5V supply rails, with Gdiff = 25 and Rout = 10k. As usual, put the collector’s quiescent point at half of VCC. Moreover, if we define a differential output voltage: Then we find it is related to the differential input as: Thus, the differential pair makes a very good difference amplifier—the kind of gain stage that is required in every operational-amplifier circuit! 5/11/2011 Differential Mode Small Signal Analysis of BJT Diff Pair 21/21 +-+-+ vbe2 ...Applications of op amps SARITHA REDDY 30.7K views•29 slides. Power amplifiers Sarah Krystelle 38.7K views•32 slides. Power amplifier ppt Krishna Ece 4.5K views•36 slides. Differential amplifier srirenga 2.8K views•13 slides. Differential amplifier Arpit Raval 4K views•12 slides.7: BJT Small Signal Amplifiers. Determine the voltage gain, input impedance and output impedance of simple BJT amplifiers. Detail the functional differences between voltage amplifiers and voltage followers. Explain the advantages and disadvantages of using localized feedback (swamping). Determine the combined characteristics of multistage BJT ...3.3. Differential Pair Amplifier with Current Source Biasing Replace Re in the differential amplifier built in Section 3.1 with the Simple current source constructed in Section 3.2. Your circuit should now look like Figure 4. • Calculate and measure the bias point and the mid-band differential (note that the output of the 1. One way to find the gains is to pick a operating point, analyze at that, then perturb it a little and analyze at that. It takes separate pertubations for a common mode change and a differential mode change. For example, analyze everything at 0 V on both inputs. For common mode gain, raise each input 1 V and analyze what happens to the …Definition: Differential Amplifier is a device that is used to amplify the difference in voltage of the two input signals. Differential Amplifier is an important building block in integrated circuits of analog system. It …Differential BJT amplifier Introduction The differential amplifier has two input signal sources. The ideal differential amplifier produces an output voltage that is the difference between the two input voltages. Vout = Avd(Vin1-Vin2) The differential amplifier has two single ended output voltages. An amplifier with sufficiently high CMRR can be used to separate the desired signal from the interfering noise. The analysis of Section 7.3.2 indicates that the common-mode rejection ratio of a differential amplifier with the output taken between collectors should be infinite.A Differential BJT amp can be viewed as the two above connected together and is called the "long-tailed pair" It is voltage controlled current by the the base voltage to emitter changes. But as Vee the emitter negative voltage is much larger than Vbe it operates as a simple constant current sink. So if Q1 rises in current then Q2 must do the ...Objective: To investigate the simple differential amplifier using NPN transistors. First a few notes on hardware limitation issues. The waveform generator in the ADALM2000 system has a high output bandwidth and with that high bandwidth comes wide band noise. The input signal level needed for the measurements in this lab activity is rather small ...The differential amplifier inherits the features of its half circuit offering a differential gain A vd = V o + − V o − V in + − V in − = − g m R L and a high input impedance. Several techniques have been used to bias the differential amplifier [1], [2], [3]. However, the most common technique remains to be through a DC tail current ...BJT Differential amplifier pair. SivaKarthik27. BJT Differential amplifier (1) ChaitanyaSC. bjt practical. Pujitha1122. Copy of BJT Differential amplifier. user-46709. Copy of BJT Differential amplifier. user-46709. Creator. Charan1212. 4 Circuits. Date Created. 2 years, 3 months ago. Last Modified.Feb 9, 2021 · Differential Amplifier built using BJT. Considering the differential amplifier built using BJTs, if the input voltage V1 at transistor Q1 is sinusoidal, then as V1 goes on increasing, the transistor Q1 starts conduction which results in a large collector current in Q1 increasing the voltage drop across Rc1, causing a decrease in output voltage V01. Feb 24, 2012 · A differential amplifier is an analog circuit with two inputs (V 1 and V 2) and one output (V 0) in which the output is ideally proportional to the difference between the two voltages. The formula for a simple differential amplifier can be expressed: Where V 0 is the output voltage V 1 and V 2 are the input voltages May 2, 2015 · 1 Answer. Sorted by: 1. It is a simple differential pair. From a differential standpoint the collector of QB is a differential ground, so the differential gain will be gm1*RC or (IC/Vt)*Rc, where IC = IQB/2. You can figure out IQB2 by analyzing the current mirror. From a common-mode standpoint the collector of QB is an open circuit, so unless ... Calculation of the common-mode gain for a balanced and a single-output differential amplifier.A circuit that produces output Voltage that is in proportion to the voltage differences amid both the signals applied at the input is referred to as a Differential Amplifier. This amplifier behaviour resembles a subtractor i.e., basically signals applied at the input are subtracted. These differential amplifiers are constructed using FETs and BJTs.The input impedance can be increased using two techniques : • Using direct coupling (Darlington connection) • Using Bootstrap technique. 1. Darlington Transistors. Figure shows the direct coupling of two stages of emitter follower amplifier. This cascaded connection of two emitter followers is called the Darlington connection.Ford has long been a name synonymous with American automotive excellence. With each passing year, they continue to raise the bar and push boundaries when it comes to design, performance, and innovation. The year 2024 is no exception.Moreover, if we define a differential output voltage: Then we find it is related to the differential input as: Thus, the differential pair makes a very good difference amplifier—the kind of gain stage that is required in every operational-amplifier circuit! 5/11/2011 Differential Mode Small Signal Analysis of BJT Diff Pair 21/21 +-+-+ vbe2 ...Apr 14, 2016 · 1. One way to find the gains is to pick a operating point, analyze at that, then perturb it a little and analyze at that. It takes separate pertubations for a common mode change and a differential mode change. For example, analyze everything at 0 V on both inputs. For common mode gain, raise each input 1 V and analyze what happens to the output. BJT Differential Amplifier. Look under the hood of most op amps, comparators or audio amplifiers, and you'll discover this powerful front-end circuit - the differential amplifier. A simple circuit able to amplify small signals applied between its two inputs, yet reject noise signals common to both inputs. This circuit has a unique topology: two ...Differential BJT Amplifier. This project shows the preliminary design of a differential amplifier, and demonstrates a Linearized Harmonic Balance (similar to a spice AC analysis) simulator …Khuếch đại vi sai ( tiếng Anh: differential amplifier) là bộ khuếch đại điện tử thực hiện khuếch đại tín hiệu điện theo sự khác biệt giữa hai điện áp ngõ vào, và ngăn chặn bất kỳ điện áp chung nào tồn tại ở cả hai ngõ đó. Nó có sự kết hợp của hai phần tử gồm ...Is there any reason why the gain of a single ended input BJT differential amplifier, with one Rc, is a good approximation of the value of Adm for a …The input impedance can be increased using two techniques : • Using direct coupling (Darlington connection) • Using Bootstrap technique. 1. Darlington Transistors. Figure shows the direct coupling of two stages of emitter follower amplifier. This cascaded connection of two emitter followers is called the Darlington connection.Mar 19, 2023 · The BJT differential amplifier is a two-input circuit that amplifies the difference between two input signals, V1 and V2 applied to the base terminals of two BJTs (Bipolar Junction Transistors), which are configured in a differential pair configuration (see figure below). The basic differential pair configuration consists of two BJTs wherein ... The BJT differential amplifier is a two-input circuit that amplifies the difference between two input signals, V1 and V2 applied to the base terminals of two BJTs (Bipolar Junction Transistors), which are configured in a differential pair configuration (see figure below). The basic differential pair configuration consists of two BJTs wherein ...Ideal Differential Amplifiers An ideal differential amplifier amplifies the difference signal between two inputs: +-Avd vi1 vi2 vi1 vi2 The need for differential amplifiers: Differential amplifiers are used to remove unwanted signals tha t are common to both input signals. For example, in many cases useful informati on is carried by theThe BJT differential AMP with an active load • Many IC amplifiers use BJT loads in place of the load resistance, R C. • BJT load resistor is usually connected as a constant-current source with a very high resistance load (output resistance of the current source) • Higher load resistance, higher output gain. Left figure shows an AMP withNeglecting the very large current source resistance in the common emitter lag, the feedback resistance for the first stage (Q1) is Rf=Re+Re+ (1/g) with 1/g=re (input resistance at the emitter node of Q2). This assumes that both transistors have equal currents Ic1=Ic2 with g1=g2=g. Therefore, the gain is (classical feedback scheme): Gdiff= …A comparison between single-stage amplifiers and differential amplifiers. A discussion on DC biasing issues. A discussion on trade-offs between MOS and BJT differential pairs. 2.0 Prelab. H & S: Chapters 11.1 - 11.2. M3501 F = 104.3 V An = 43.3V . N3515 V TOn = 0.88 V n C ox =79.47 A/V 2 n = 0.06 V-1. 2.1 1. BJT Differential PairMar 21, 2023 · The basic BJT and MOSFET-based differential amplifier consists of two transistors and two resistors and has been further developed by replacing the resistors with transistors. The advantages include its inherent single-ended output, improved Common-Mode Rejection Ratio (CMRR), and greater output impedance [ 3 , 4 , 5 ]. 11 Differential Amplifier Circuits - 300 - Figure 11.6: Differential input circuit of an emitter couple BJT differential amplifier Asssuming identical transistor, the increase of emitter voltage by V in1 i.e V in(d) /2 is compensated by the decrease of same value of emitter voltage by V in2 i.e. – Vin(d) /2. A differential amplifier is a type of electronic amplifier that amplifies the difference between two input voltages but suppresses any voltage common to the two inputs. It is an analog circuit with two inputs and + and one output , in which the output is ideally proportional to the difference between the two voltages:Here is the schematic of the BJT diff amplifier, I wanted to solve (design). The task is from the book "Art of Electronics". Exercise 2.18. Verify that these expressions are correct. Then design a differential amplifier to run from ±5V supply rails, with Gdiff = 25 and Rout = 10k. As usual, put the collector’s quiescent point at half of VCC.To keep your wheels rotating at the same speed, you can manually lock your rear differential. Learn how to lock the rear differential in this article. Advertisement The three jobs of the differential in a car are to channel the power of the...3.1 Differential Amplifier Consider the following circuit: Figure 1 • Assuming that both bases are grounded, compute the expected values of IC1, IC2 and IE. Also calculate values for the differential and common mode gains of this amplifier. • Using transistors 1 and 2 in the array, construct the circuit in Figure 1. Be sure to connect pinDifferential Amplifier using BJT. The simplest form of differential amplifier can be constructed using Bipolar Junction Transistors as shown in the below circuit diagram. It is constructed using two matching transistors in common emitter configuration whose emitters are tied together. Differential Amplifier using Transistor – Circuit DiagramA dual input unbalanced output BJT differential amplifier has two inputs and a single output. It is commonly used in analog circuit design, particularly in audio applications, because it can amplify small signals and reject common-mode noise. The circuit diagram of dual input unbalanced output differential amplifier is shown below.6–4 The Common-Collector Amplifier 6–5 The Common-Base Amplifier 6–6 Multistage Amplifiers 6–7 The Differential Amplifier 6–8 Troubleshooting Device Application CHAPTER OBJECTIVES Describe amplifier operation Discuss transistor models Describe and analyze the operation of common-emitter amplifiersJun 26, 2021 · The differential input impedance is 400 Ω. That's the short answer. And, this assumes that the input voltage is sufficiently low so as not to cause op-amp saturation and, that the input frequency is low enough so that the gain-bandwidth-product of the op-amp produces enough open-loop gain so that we can assume ideal op-amp operation. Here is a plot with V IN1 and the differential output voltage: Here we have an output amplitude of 10 mV and an input amplitude of 1 mV; hence, our simulated differential gain is 10. The formula for theoretical differential gain is. Adiff = gm ×RD A d i f f = g m × R D. where g m can be calculated as follows:Question: My objective is to understand the need of the tail current source in a differential amplifier.. Answer: Consider, what the diff. amplifier is in principle: A two-stage amplifier consisting of a common-gate stage (NMOS 2) driven by a common-drain stage (NMOS1). This description is referenced to an input at the gate of NMOS1. …The current gain of the differential amplifier is undefined. Like CE amplifier the differential amplifier is a small signal amplifier. It is generally used as a voltage amplifier and not as current or power amplifier. Example - 1 . The following specifications are given for the dual input, balanced-output differential amplifier: R. C. B. in 1 ...11 Differential Amplifier Circuits - 300 - Figure 11.6: Differential input circuit of an emitter couple BJT differential amplifier Asssuming identical transistor, the increase of emitter voltage by V in1 i.e V in(d) /2 is compensated by the decrease of same value of emitter voltage by V in2 i.e. – Vin(d) /2.The BJT di erential pair The circuit shown in Fig. 3, known as the BJT di erential pair, can be used to amplify only the di erential input signal Vid =(Vi1 Vi2) while rejecting the common-mode signal ViC = 1 2 (Vi1+ Vi2). The two resistors are assumed to be matched and so are the BJTs 2 Q 1 and Q2. Vo Vi 1 Vi2 Vc1 Vc2 VEE I0 VCC RC RC Q Q2 ...reach me now Are you seeking the best option to differentiate and amplify two input signals in an integrated circuit? If your answer is yes, then you need a BJT differential amplifier. No doubt, other devices—like an Op-Amp, can work. But this particular amplifier stands out. It uses identical transistors, supply rails, and a collector resistor.Nov 27, 2018 · Feedback amplifiers ForwardBlog Enewzletter 61.6K views•13 slides. Inverting amplifier hepzijustin 982 views•11 slides. Differential amplifier Arpit Raval 4K views•12 slides. 3.bipolar junction transistor (bjt) firozamin 104.4K views•44 slides. Power amplifiers Sarah Krystelle 38.5K views•32 slides. Pll ppt parassini 7.3K views•31 ... A Differential BJT amp can be viewed as the two above connected together and is called the "long-tailed pair" It is voltage controlled current by the the base voltage to emitter changes. But as Vee the emitter negative voltage is much larger than Vbe it operates as a simple constant current sink. So if Q1 rises in current then Q2 must do the ...1. One way to find the gains is to pick a operating point, analyze at that, then perturb it a little and analyze at that. It takes separate pertubations for a common mode change and a differential mode change. For example, analyze everything at 0 V on both inputs. For common mode gain, raise each input 1 V and analyze what happens to the output.Wheatstone bridge excercise with Differential Amplifier: Homework Help: 3: Jul 7, 2023: Design of differential pair amplifier that is having maximum voltage gain with linearity and it should be biased by a current source while the biasing: Homework Help: 1: Jun 22, 2023: E: Differential Amplifier Analysis/Design: Homework Help: 10: Jun 7, 2020The main symptom of a bad differential is noise. The differential may make noises, such as whining, howling, clunking and bearing noises. Vibration and oil leaking from the rear differential seal may also be signs of a failing differential.Is there any reason why the gain of a single ended input BJT differential amplifier, with one Rc, is a good approximation of the value of Adm for a …May 31, 2022 · A differential amplifier is a basic building block for analog integrated circuit design; the operational amplifier integrated circuit has wide applications in signal processing. In this paper, a bipolar junction transistor BJT differential amplifier circuit is analyzed and designed to determine the output resistance and the differential mode ... A differential amplifier amplifies the difference between two inputs. The purpose of the 'tail' current is to split that difference between the two sides of the amp. To do this the input voltage must be referenced to ground, so that any increase in current on side causes a corresponding decrease on the other, and vice versa.LM741 op-amp 1 2N3904 NPN BJT 4 2N3906 PNP BJT 2 1 kΩ resistor 2 10 kΩ resistor 2 0.1 µF capacitor 1 Table 1: Components used in this lab Component IS (A) VA (V) 2N3904 NPN BJT 6.734×10−15 74.03 2N3906 PNP BJT 1.41×10−15 18.7 Table 2: Transistor properties 3 Procedure 3.1 Generating a diﬀerential signalThe dual input balanced output differential amplifier configuration is shown in Fig. 20.2. In the given circuit two input signals v in1 and v in2 are applied to the bases B 1 and B 2 of transistors Q 1 and Q 2. The differential input under amplification is the difference of the two input signals v in1 and v in2 and denoted by v d.A differential amplifier is a basic building block for analog integrated circuit design; the operational amplifier integrated circuit has wide applications in signal processing. In this paper, a bipolar junction transistor BJT differential amplifier circuit is analyzed and designed to determine the output resistance and the differential mode ...Consider the differential amplifier shown below with RB = 50K2 and Rc = 10KQ and assume the BJT parameters for Q1, Q2, Q3 and Q4 are VA = 70V and B=100. The amplifier is biased with VCC = +10V and VEE = -10V. You may assume VBE = 0.7 when forward biased for all BJTs. What is the common mode output impedance?Amplifier Circuit – The direct-coupled amplifier in Fig. 18-33 has a BJT Power Amplifier with Differential Input Stages constituted by transistors Q1 and Q2. It ...\$\begingroup\$ There are multiple reasons for non-ideality resulting in common-mode gain (more usually referred to as its reciprocal - Common mode rejection ratio - CMRR). ). For example if the current source in the emitter was not perfect and the current changed with the voltage across it the output would depend upon the level of the input volIn short, a differential amplifier suppresses in phase signals while simultaneously boosting out of phase signals. This can be a very useful attribute, particularly in the area of noise reduction. Figure 7.5.9: Input-output waveforms for common mode. Figure 7.5.9: (continued) Input-output waveforms for common mode.Differential BJT amplifier Introduction The differential amplifier has two input signal sources. The ideal differential amplifier produces an output voltage that is the difference between the two input voltages. Vout = Avd(Vin1-Vin2) The differential amplifier has two single ended output voltages. Difference amplifiers should have no common-mode gain Note that each of these gains are open-circuit voltage gains. * An ideal differential amplifier has zero common-mode gain (i.e., A cm =0)! * In other words, the output of an ideal differential amplifier is independent of the common-mode (i.e., average) of the two input signals.BJT Amplifiers 6 CHAPTER OUTLINE 6–1 Amplifier Operation 6–2 Transistor AC Models 6–3 The Common-Emitter Amplifier 6–4 The Common-Collector Amplifier 6–5 The Common-Base Amplifier 6–6 Multistage Amplifiers 6–7 The Differential Amplifier 6–8 Troubleshooting Device Application CHAPTER OBJECTIVES Describe amplifier operation Lecture 17. Differential Amplifiers – II Current Mirror Load and Single-Ended Output. In this lecture you will learn: Differential Amplifiers. Use of Current Mirrors in Differential …This is the third part in the series of differential amplifier. It covers in detail small signal analysis (AC Analysis) of BJT Differential amplifier. The di...1. One way to find the gains is to pick a operating point, analyze at that, then perturb it a little and analyze at that. It takes separate pertubations for a common mode change and a differential mode change. For example, analyze everything at 0 V on both inputs. For common mode gain, raise each input 1 V and analyze what happens to the output.Unlike normal amplifiers, which amplify a single input signal (often called single-ended amplifiers), differential amplifiers amplify the voltage difference between two input signals. Using the simplified triangle amplifier symbol, a differential amplifier looks like this: The two input leads can be seen on the left-hand side of the triangular ...Khuếch đại vi sai ( tiếng Anh: differential amplifier) là bộ khuếch đại điện tử thực hiện khuếch đại tín hiệu điện theo sự khác biệt giữa hai điện áp ngõ vào, và ngăn chặn bất kỳ điện áp chung nào tồn tại ở cả hai ngõ đó. Nó có sự kết hợp của hai phần tử gồm ...Learn about the differential pair, a basic building block of analog circuits, in this lecture from EE105 Fall 2015 Microelectronic Devices and Circuits course at UC Berkeley. The lecture covers the operation, analysis, and design of differential amplifiers, common-mode rejection, and differential output stages.Differential BJT amplifier Introduction The differential amplifier has two input signal sources. The ideal differential amplifier produces an output voltage that is the difference between the two input voltages. Vout = Avd(Vin1-Vin2) The differential amplifier has two single ended output voltages. The BJT and MOS versions function as an inverting voltage amplifier and are shown in figure 9.2. The base or gate terminal of the transistor serves as the input, the collector or drain is the output, and the emitter or source is common to both input and output (it may be tied to the ground reference or the power supply rail), which gives rise ...Dec 12, 2020 · I am working my way through the Art of Electronics and I have today studied the differential amplifier. I aam having issues with Exercise 2.18: Design a differential amplifier to run from ±5V supply rails, with Gdiff = 25 and Rout = 10k. As usual, put the collector’s quiescent point at half of VCC. The differential amplifier circuit using transistors can be designed as shown in the figure below which consists of two transistors T1 and T2. These transistors and resistors are connected as shown in the circuit diagram. Circuit using Transistors. There are two inputs I1 & I2 and two outputs V1out & V2out in the differential amplifier circuit.Dec 14, 2021 · Differential amplifier are also called difference amplifier. They can be constructed using discrete BJT(Bipolar Junction Transistor) transistors or FET(Field Effect Transistor) or fabricated in a single Integrated Circuits(IC) chips. Differential amplifier forms the basic building blocks for Operational Amplifiers(op-amps). In op-amps ... Objective: To investigate the simple differential amplifier using NPN transistors. First a few notes on hardware limitation issues. The waveform generator in the ADALM2000 system has a high output bandwidth and with that high bandwidth comes wide band noise. The input signal level needed for the measurements in this lab activity is rather small ... Whether you’re hosting a wedding or putting on a concert for friends, a great loudspeaker or public address (PA) system will help you deliver — and amplify — your message. But not all systems are created equally.Find step-by-step Engineering solutions and your answer to the following textbook question: A BJT differential amplifier operating with a 0.5-mA current ...• MOSFET Differential Amplifiers • Reading: Chapter 10.3‐10.6 EE105 Spring 2008 Lecture 24, Slide 1Prof. Wu, UC Berkeley Common‐ ... MOSFET Differential Pair BJT Differential Pair EE105 Spring 2008 Lecture 24, Slide 10 Prof. Wu, UC Berkeley. 5/6/2008 EE105 Fall 2007 6410. The first-stage two-transistor differential amplifier can be used as a wide-band high-impedance input follower, followed by a gain-of-two op amp in the second stage. In any case, the original designer of the circuit may need to be consulted to understand its true function and purpose. Nov 8, 2022. #17.The overtime differential is most commonly a rate of one and one-half times a non-exempt worker's regular rate. Shift differential pay rates make this calculation more complicated. The U.S. Department of Labor's Fair Labor Standards Act req...The BJT Differential Amplifier Basic Circuit Figure 1 shows the circuit diagram of a differential amplifier. The tail supply is modeled as a current source I Q. The object is to solve for the small-signal output voltages and output resistances. It will be assumed that the transistors are identical.The BJT Differential Amplifier Basic Circuit Figure 1 shows the circuit diagram of a differential amplifier. The tail supply is modeled as a current source I Q. The object is to solve for the small-signal output voltages and output resistances. It will be assumed that the transistors are identical.A differential amplifier is a basic building block for analog integrated circuit design; the operational amplifier integrated circuit has wide applications in signal processing. In this paper, a bipolar junction transistor BJT differential amplifier circuit is analyzed and designed to determine the output resistance and the differential mode .... I have a question regarding differential amplreach me now Are you seeking the best option to differentiate and amp Capacitor is used for eliminating the DC part. Besides if the power supply of the amplifier is unipolar but the input signal is bipolar, the circuit won't work. Your amplifier is powered by +-vcc, and hence you don't need capacitor at input.Here's the approach. Starting at the collector of Q 2, we can say at the voltage there is 20 V − I C 2 ⋅ R C 2. We now subtract from this V B E 3 ≈ 700 mV to get to the emitter of Q 3. Then apply the voltage divider there to get the base voltage of Q 2 as: V B 2 = ( 20 V − I C 2 ⋅ R C 2 − V B E 3) ⋅ R 5 R 4 + R 5. An amplifier with sufficiently high CMRR can be used Here is the schematic of the BJT diff amplifier, I wanted to solve (design). The task is from the book "Art of Electronics". Exercise 2.18. Verify that these expressions are correct. Then design a differential amplifier to run from ±5V supply rails, with Gdiff = 25 and Rout = 10k. As usual, put the collector’s quiescent point at half of VCC. The BJT differential amplifier with constant curre...

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