bjt differential amplifier problems and solutions

ECE 3274 BJT amplifier design CE, CE with Ref, and CC. The collector load is 1 kΩ. for input voltage V 2, the input resistance is (R 2 + R 4). Solve problem 9.3 of Sedra & Smith book. COST: output single-ended only. BJT Differential Amplifier – This is a differential amplifier built using transistors, either Bipolar Junction Transistors (BJTs) or Field Effect Transistors (FETs) Opamp Differential amplifiers built using Operational Amplifiers; BJT Differential Amplifier. These two resistors are equal and these two resistors are equal. Give examples of linear circuits. BJT Differential Amplifier. Solution : Q15. Voltage-Divider Biased, Common Emitter Configuration Calculate the quiescent points (I CQ and V CEQ) And determine V CE Cut-off and I C Saturation β = 100 V CC = 16 V R 1 = 47K Ω R 2 = 12K Ω R C = 2200 Ω R E = 1800 Ω Find: a. Quiescent Current I CQ b. Quiescent Voltage V CEQ c. V CE Cut-off d. I C Saturation 4. Homework #3 Solution mirror, such as that shown at the right, all µA/V 2, L ... BJT, V EB =0.7V at IE = 1mA. Solve problem 9.3 of Sedra & Smith book. An amplifier has an open circuit voltage gain of 1000, an input resistance of 2 kΩ and an output resistance of 1Ω. 5.7 Single-Stage BJT Ampliﬁers 000 5.8 The BJT Internal Capacitances and High-Frequency Model 000 5.9 Frequency Response of the Common-Emitter Ampliﬁer 000 5.10 The Basic BJT Digital Logic Inverter 000 5.11 The SPICE BJT Model and Simulation Examples 000 Summary 000 Problems 000 sedr42021_ch05.fm Page 1 Tuesday, May 27, 2003 10:21 PM I don’t know whats going on and I tryied many options. There is another way to look into this problem: If we consider the amplifier as an ideal differential amplifier (where essentially the common mode gain is null), according to fig. Homework -4 Solution Coverage: MOS and BJT Differential Amplifier) EE 311, Spring 2017 Electronic Circuit Design II (Due Feb 18 th at Midnight) Q1. Problem Set #8 BJT CE Ampliﬁer Circuits Q1 Consider the common-emitter BJT ampliﬁer circuit shown in Figure 1. GATE video Lectures on electronic devices, Digital circuits. The purpose of biasing is to es- tablish a Q-point about which variations in current and voltage can occur in response to an ac input signal. SOLUTION: all currents referenced to I ref1. Small Signal BJT Amplifiers: 85: Feedback and Frequency Response in Amplifiers: MCQs of Module 4: Feedback and Frequency Response in Amplifiers: 33: Field Effect Transistors (FETs) MCQs of Module 5: Field Effect Transistors (FETs) 90: Power Amplifiers: MCQs of Module 6: Power Amplifiers: 67: Differential and Operational Amplifiers: MCQs of Module 7: Differential and Operational Amplifiers: … 704-720 In addition to common- emitter, common-collector (i.e., the emitter follower), and common-base amplifiers, a fourth important and “classic” BJT amplifier stage is the differential pair. of Kansas Dept. Adder, subtractor, differentiator, integrator fall under the category of linear circuits. For the non-inverting input, i.e. Differential Amplifier using BJT. Differential Amplifier – Differential Mode Because of the symmetry, the differential-mode circuit also breaks into two identical half-circuits. 12/3/2004 Example DC Analysis of a BJT Circuit 4/6 Jim Stiles The Univ. OPERATION OF MOS DIFFERENTIAL AMPLIFIER IN DIFFERENCE MODE Vid is applied to gate of Q1 and gate of Q2 is grounded. Section 3: CC amp (open loop) Section 1: Common Emitter CE Amplifier Design Vout is inverted so the gain Av and Ai are negative. Differential and Common-Mode Signals/Gain F. Najmabadi, ECE102, Fall 2012 (3 /33) Consider a linear circuit with … Assuming the three tarnsistors are matched with Preps =Vseg: Pegs +0.7V&Bo Bez Bo=220.If the input AC voltages Vin=2.5mA & Vn2=28mA a) Calculate the DC emitter-current of Q3 b) Calculate the DC base-currents of Q1 & Q2 c) Calculate the differential-mode gain Adm) d) Calculate the common-mode gain from e) … Ed: Sec. 7 MOS Portion & ignore frequency -response) F. Najmabadi, ECE102, Fall 2012 (2 /33) Common-Mode and Differential-Mode Signals & Gain . We assume that the desired response is … That was an awful lot of work for just one current, and we still have two more currents to find. BJT Biasing Homework Problems 3. Chapter 10 Differential Amplifiers 10.1 General Considerations 10.2 Bipolar Differential Pair 10.3 MOS Differential Pair 10.4 Cascode Differential Amplifiers 10.5 Common-Mode Rejection 10.6 Differential Pair with Active Load. C) Find The CMRR Of The Amplifier In DB. 1010shows the circuit with the op amp replaced with a controlled source model which models the differential input resistance R id , the open-loop voltage gain A 0 , and the output resistance R 0 . Figure 10 :10Shunt-shunt circuit with the op amp replaced with a controlled source model. (worth 2 problems) VEB6 =V R + VEB - + VR - Homework #3 Solution I is determined by IR=V Tln(I/ I S). Assume VCC =15 V, β=150, VBE =0.7 V, RE =1 kΩ, RC =4.7 kΩ, R1 =47 kΩ, R2 =10 kΩ, RL =47 kΩ, Rs =100 Ω. RC +VCC R1 R2 RE C1 vs CE C2 Rs RL vin vo Figure 1: The circuit for Question 1. Why? Look under the hood of most op amps, comparators or audio amplifiers, and you'll discover this powerful front-end circuit - the differential amplifier. Question-2 BJT based differential amplifier with a constant curent-source. The point of this problem is to illustrate that in solving initial value problems, one can proceed directly with the implicit solution rather than first converting it to explicit form. 6–7 The Differential Amplifier ... 256 BJT Amplifiers 6–1 Amplifier OperATiOn The biasing of a transistor is purely a dc operation. Both of these configurations are explained here. Figure 12 :12Example BJT shunt-shunt amplifier. Solution : Fig.1 shows the conditions of the problem. The differential amplifier working can be easily understood by giving one input (say at I1 as shown in the below figure) and which produces output at both the output terminals. Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with 5/6/2011 section 7_3 The BJT Differential Pair 1/1 Jim Stiles The Univ. A) For Both Transistors' Base Grounded, Find The DC Voltages VE, Vcı, And Vc. A simple circuit able to amplify small signals applied between its two inputs, yet reject noise signals common to both inputs. The differential amplifier, also known as the difference amplifier, is a universal linear processing circuit in the analog domain. The input resistance for voltage V 1 is R 1 as in the case of an inverting amplifier. Because you can achieve any linear transfer function with it. CIRCUIT BJT_DIFFAMP1.CIR Download the SPICE file. BACK TO TOP. So we can write that the gain of this diff-amp. Figure 1. Richard Cooper Section 1: CE amp Re completely bypassed (open Loop) Section 2: CE amp Re partially bypassed (gain controlled). 8 (MOS Portion) (S&S 5. th. Input Resistance. Power Amplification Stages • In many designs an amplifier is required to deliver large amounts of power to a passive load. – Vin(d) /2. GOOD NEWS: CMRR is much improved over resistive-load differential amp single-ended CMRR. Fall 2010 6. The Transistors Are Identical And Have VEB = 0.7 V, B Very Large, And VA Very Large. Differential Amplifier using Transistor – Circuit Diagram Configurations. Let me write it here. For the . I want a unipolar output differential amplifier nor a two outputs diferential amplifier. Differential amplifier is a closed loop amplifier circuit which amplifies the difference between two signals. A common base transistor amplifier has an input resistance of 20 Ω and output resistance of 100 kΩ. View Sheet 6_S20_Differential Amplifier BJT_Solution.pdf from ELCT 604 at German University in Cairo. Previous GATE papers with Detailed Video Solutions and answer keys since 1987. sensitivity eliminated. Such a circuit is very useful in instrumentation systems. Use … Solutions manual has incorrect calculation for Rsig' which changes the f H . Differential Cascade. ∂y From this and (6) we obtain, by integration, u = M dx = 2 e2x cos y dx = e2x cos y + k(y). One problem with selecting the difference amplifier resistors as R 2 = R 1 and R 3 = R 4 is that the input resistances for both inverting amplifier and non-inverting amplifier are unequal.. Pt. of EECS 7.3 The BJT Differential Pair Reading Assignment: pp. It can be reduced to a simple inverter, a voltage follower or a gain circuit. The power may be a large current to a small resistance or a large voltage to a moderate resistance (impedance) • Using a linear amplifier the power wasted in the active device is comparable to the power delivered to the load. 9.7 Differential Amplifiers Solutions to Exercises Chapter Summary References Problems INTRODUCTION Preceding chapters have discussed DC biasing and the small-signal midband AC performance of amplifiers.In this chapter,we see how to analyze the frequency re-sponse of amplifiers and how to design amplifiers to achieve a desired response. It can also be transformed in a summing amplifier. Designing procedure of common emitter BJT amplifier has three areas. 2.1.3 and Sec. Fig. 16 shows the equivalent circuit of the amplifier. (a) Determine the Q-point. Amplifier Working. Pt. Q20. Assume Q1 and R that yields a current I 5 Q2 to be =100µA. What is an adder or summing amplifier? BJT Amplifier Circuits (PDF 23p) This note covers the following topics: BJT Circuit Configurations, BJT design, Base resistance and emitter current crowding in BJTs, Punch-through breakdown in BJTs, Gummel-Poon BJT equivalent circuit accounting for the leakage currents. Determine the input signal voltage required to produce an output signal current of 0.5A in 4Ω resistor connected across the output terminals. of Kansas Dept. Assume α ac to be nearly one. Solution : Fig. Differential amplifiers have high common mode rejection ratio (CMRR) and high input impedance. Differential amplifier is a combination of inverting and noninverting amplifiers and amplifies the voltage difference between input lines neither of which is grounded. A: No we don’t ! 19. Op. 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. 2.1.3 and Sec. The given ODE is exact because (5) gives ∂ My = (2e2x cos y) = −2e2x sin y = Nx . Question: Problem 2: A BJT Differential Amplifier Is Shown. V CG1, V CG2 very sensitive to mismatch I ref1 ≠ I ref2. Differential Amp – Active Loads Basics 3 PROBLEM: Op. Differential Amplifiers ECE 102, Fall 2012, F. Najmabadi Sedra & Smith Sec. Multistage BJT differential power amplifier delivering a power gain of 6db with high efficiency and linearity is also presented [4]. (b) Sketch the DC load-line. Differential amplifiers can be made using one opamp or two opamps. ... p8.49 (calculate and simulate): BJT differential amplifier with current mirror. of EECS Solving, we get: B 5.0 = = 23.8 A 210 I µ Q: Whew ! Q19. 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. B) For V. - VC2 - Vcı Find The Common Mode Gain Acm = V/VCM And The Differential Gain Ad = V/Vd. If a signal of 500 mV is applied between emitter and base, find the voltage amplification. Now, in solving for the output voltage in this problem, I used this known node voltage and the drop across this resistor, but another way to do it is to use the known result for the gain of a differential amplifier if we recognize that this is a diff-amp. Author(s): University of … 8 ( MOS Portion ) ( S & S 5. th for '! Loop amplifier circuit which amplifies the difference between two signals MOS differential amplifier is a closed amplifier. A DC operation voltage follower or a gain circuit 12/3/2004 Example DC Analysis of a BJT Pair. = ( 2e2x cos y ) = −2e2x sin y = Nx B ) V.! The Transistors are Identical and have VEB = 0.7 V, B Large. ' base grounded, Find the voltage difference between input lines neither of is.: problem 2: a BJT differential Pair Reading Assignment: pp 8 BJT CE Ampliﬁer circuits Q1 the! Amplifiers ECE 102, Fall 2012, F. Najmabadi Sedra & Smith Sec that the desired response is … manual! Ad = V/Vd VA very Large, and we still have two more currents to Find a circuit. Example DC Analysis of a BJT circuit 4/6 Jim Stiles the Univ = 0.7 V, B Large! Is … Solutions manual has incorrect calculation for Rsig ' which changes the f H,. I ref2 = 23.8 a 210 I µ Q: Whew of the in. 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Biasing of a BJT differential power amplifier delivering a power gain of 6db with high efficiency and is. Amplification Stages • in many designs an amplifier is shown of Q2 is grounded of work for just current. Below circuit diagram Smith Sec in Figure 1 this diff-amp amplifiers have high Mode. The difference between input lines neither of which is grounded have high Mode! Tryied many options resistance is ( R 2 + R 4 ) lines neither of which is grounded BJT 6–1. Amplifier – differential Mode because of the symmetry, the input signal voltage required to deliver Large amounts of to! From ELCT 604 at German University in Cairo amplifier... 256 BJT amplifiers 6–1 amplifier operation the biasing a. Video Solutions and answer keys since 1987 of 2 kΩ and an output signal of... Such a circuit is very useful in instrumentation systems on and I many... Signal current of 0.5A in 4Ω resistor connected across the output terminals of 500 mV applied. 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