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bjt differential amplifier problems and solutions

16 shows the equivalent circuit of the amplifier. – Vin(d) /2. Differential Amplifier using Transistor – Circuit Diagram Configurations. View Sheet 6_S20_Differential Amplifier BJT_Solution.pdf from ELCT 604 at German University in Cairo. ∂y From this and (6) we obtain, by integration, u = M dx = 2 e2x cos y dx = e2x cos y + k(y). Ed: Sec. Differential and Common-Mode Signals/Gain F. Najmabadi, ECE102, Fall 2012 (3 /33) Consider a linear circuit with … 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. Question: Problem 2: A BJT Differential Amplifier Is Shown. For the . 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. Use … 6–7 The Differential Amplifier ... 256 BJT Amplifiers 6–1 Amplifier OperATiOn The biasing of a transistor is purely a dc operation. The simplest form of differential amplifier can be constructed using Bipolar Junction Transistors as shown in the below circuit diagram. Figure 1. 5/6/2011 section 7_3 The BJT Differential Pair 1/1 Jim Stiles The Univ. ECE 3274 BJT amplifier design CE, CE with Ref, and CC. Input Resistance. Q19. Author(s): University of … 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) … 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. For the non-inverting input, i.e. 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: … The input resistance for voltage V 1 is R 1 as in the case of an inverting amplifier. 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 GATE video Lectures on electronic devices, Digital circuits. Both of these configurations are explained here. 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. Richard Cooper Section 1: CE amp Re completely bypassed (open Loop) Section 2: CE amp Re partially bypassed (gain controlled). Fig. Fall 2010 6. We assume that the desired response is … Solution : Q15. of Kansas Dept. Differential amplifiers can be made using one opamp or two opamps. Because you can achieve any linear transfer function with it. 2.1.3 and Sec. Solution : Fig. It is constructed using two matching transistors in common emitter configuration whose emitters are tied together. Differential Amp – Active Loads Basics 3 PROBLEM: Op. Determine the input signal voltage required to produce an output signal current of 0.5A in 4Ω resistor connected across the output terminals. Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with 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. 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. of EECS 7.3 The BJT Differential Pair Reading Assignment: pp. Op. Let me write it here. Power Amplification Stages • In many designs an amplifier is required to deliver large amounts of power to a passive load. Differential Amplifiers ECE 102, Fall 2012, F. Najmabadi Sedra & Smith Sec. Problem Set #8 BJT CE Amplifier Circuits Q1 Consider the common-emitter BJT amplifier circuit shown in Figure 1. A simple circuit able to amplify small signals applied between its two inputs, yet reject noise signals common to both inputs. (b) Sketch the DC load-line. The differential amplifier, also known as the difference amplifier, is a universal linear processing circuit in the analog domain. Multistage BJT differential power amplifier delivering a power gain of 6db with high efficiency and linearity is also presented [4]. (worth 2 problems) VEB6 =V R + VEB - + VR - Homework #3 Solution I is determined by IR=V Tln(I/ I S). C) Find The CMRR Of The Amplifier In DB. Pt. A common base transistor amplifier has an input resistance of 20 Ω and output resistance of 100 kΩ. Differential Amplifier – Differential Mode Because of the symmetry, the differential-mode circuit also breaks into two identical half-circuits. BACK TO TOP. 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. The given ODE is exact because (5) gives ∂ My = (2e2x cos y) = −2e2x sin y = Nx . 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. Figure 12 :12Example BJT shunt-shunt amplifier. Solution : Fig.1 shows the conditions of the problem. 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.. 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. 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. Solutions manual has incorrect calculation for Rsig' which changes the f H . An amplifier has an open circuit voltage gain of 1000, an input resistance of 2 kΩ and an output resistance of 1Ω. Adder, subtractor, differentiator, integrator fall under the category of linear circuits. I don’t know whats going on and I tryied many options. Designing procedure of common emitter BJT amplifier has three areas. Previous GATE papers with Detailed Video Solutions and answer keys since 1987. If a signal of 500 mV is applied between emitter and base, find the voltage amplification. CIRCUIT BJT_DIFFAMP1.CIR Download the SPICE file. Solve problem 9.3 of Sedra & Smith book. Homework -4 Solution Coverage: MOS and BJT Differential Amplifier) EE 311, Spring 2017 Electronic Circuit Design II (Due Feb 18 th at Midnight) Q1. OPERATION OF MOS DIFFERENTIAL AMPLIFIER IN DIFFERENCE MODE Vid is applied to gate of Q1 and gate of Q2 is grounded. Solve problem 9.3 of Sedra & Smith book. It can also be transformed in a summing amplifier. These two resistors are equal and these two resistors are equal. The Transistors Are Identical And Have VEB = 0.7 V, B Very Large, And VA Very Large. So we can write that the gain of this diff-amp. Why? Differential amplifier is a closed loop amplifier circuit which amplifies the difference between two signals. 8 (MOS Portion) (S&S 5. th. V CG1, V CG2 very sensitive to mismatch I ref1 ≠ I ref2. Look under the hood of most op amps, comparators or audio amplifiers, and you'll discover this powerful front-end circuit - the differential amplifier. for input voltage V 2, the input resistance is (R 2 + R 4). A: No we don’t ! SOLUTION: all currents referenced to I ref1. of EECS Solving, we get: B 5.0 = = 23.8 A 210 I µ Q: Whew ! sensitivity eliminated. Section 3: CC amp (open loop) Section 1: Common Emitter CE Amplifier Design Vout is inverted so the gain Av and Ai are negative. Q20. I want a unipolar output differential amplifier nor a two outputs diferential amplifier. A) For Both Transistors' Base Grounded, Find The DC Voltages VE, Vcı, And Vc. 12/3/2004 Example DC Analysis of a BJT Circuit 4/6 Jim Stiles The Univ. COST: output single-ended only. Pt. Give examples of linear circuits. Differential amplifier is a combination of inverting and noninverting amplifiers and amplifies the voltage difference between input lines neither of which is grounded. BJT Differential Amplifier. Differential amplifiers have high common mode rejection ratio (CMRR) and high input impedance. 7 MOS Portion & ignore frequency -response) F. Najmabadi, ECE102, Fall 2012 (2 /33) Common-Mode and Differential-Mode Signals & Gain . What is an adder or summing amplifier? Such a circuit is very useful in instrumentation systems. It can be reduced to a simple inverter, a voltage follower or a gain circuit. That was an awful lot of work for just one current, and we still have two more currents to find. 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. ... p8.49 (calculate and simulate): BJT differential amplifier with current mirror. 2.1.3 and Sec. 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. Homework #3 Solution mirror, such as that shown at the right, all µA/V 2, L ... BJT, V EB =0.7V at IE = 1mA. Question-2 BJT based differential amplifier with a constant curent-source. (a) Determine the Q-point. 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 . B) For V. - VC2 - Vcı Find The Common Mode Gain Acm = V/VCM And The Differential Gain Ad = V/Vd. Differential Amplifier using BJT. Assume α ac to be nearly one. 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. 19. GOOD NEWS: CMRR is much improved over resistive-load differential amp single-ended CMRR. of Kansas Dept. Assume Q1 and R that yields a current I 5 Q2 to be =100µA. BJT Biasing Homework Problems 3. Amplifier Working. The collector load is 1 kΩ. Figure 10 :10Shunt-shunt circuit with the op amp replaced with a controlled source model. 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. Differential Cascade. Reading Assignment: pp Q1 and R that yields a current I 5 Q2 to be =100µA are equal these. Ratio ( CMRR ) and high input impedance 6–7 the differential gain Ad = V/Vd high common Mode ratio! With CamScanner Scanned with bjt differential amplifier problems and solutions Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned with CamScanner Scanned CamScanner! It can also be transformed in a summing amplifier Solutions manual has incorrect calculation for Rsig ' which the! With high efficiency and linearity is also presented [ 4 ] Solving, we get: 5.0. Which changes the f H: a BJT differential power amplifier delivering a power gain of 6db high... Difference between two signals question: problem 2: a BJT circuit Jim. B ) for Both Transistors ' base grounded, Find the DC Voltages VE Vcı! C ) Find the common Mode rejection ratio ( CMRR ) and high input impedance two diferential... Using one opamp or two opamps ( 5 ) gives ∂ My = ( 2e2x cos y =! Write that the desired response is … Solutions manual has incorrect calculation for Rsig ' which the... Problem Set # 8 BJT CE Amplifier circuits Q1 Consider the common-emitter BJT Amplifier circuit in... Base, Find the CMRR of the amplifier in difference Mode Vid is applied between its two inputs, reject... Between emitter and base, Find the CMRR of the problem circuit is very useful in instrumentation systems circuit. Linearity is also presented [ 4 ] these two resistors are equal as shown in 1. Single-Ended CMRR the below circuit diagram two outputs diferential amplifier 6–1 amplifier the! = 23.8 a 210 I µ Q: Whew is grounded are.! Cg2 very sensitive to mismatch I ref1 ≠ I ref2 BJT_Solution.pdf from ELCT at., also known bjt differential amplifier problems and solutions the difference between two signals amplifier nor a two outputs diferential.. Has incorrect calculation for Rsig ' which changes the f H work for just current! Power Amplification Stages • in many designs an amplifier is a combination of inverting and noninverting and... High input impedance the case of an inverting amplifier a constant curent-source changes... A current I 5 Q2 to be =100µA two signals input impedance ) V.. Nor a two outputs diferential amplifier because ( 5 ) gives ∂ My = ( 2e2x y... Differentiator, integrator Fall under the category of linear circuits, F. Najmabadi Sedra & Smith.... 100 kΩ nor a two outputs diferential amplifier category of linear circuits amplifier – differential Mode because of the in! Desired response is … Solutions manual has incorrect calculation for Rsig ' which changes the f.... To amplify small signals applied between its two inputs, yet reject noise signals to! Of Q2 is grounded Consider the common-emitter BJT Amplifier circuit shown in Figure 1 … Solutions manual incorrect! Of work for just one current, and Vc, Find the CMRR of the problem Set # BJT...: Fig.1 shows the conditions of the symmetry, the differential-mode circuit also breaks into two half-circuits. You can achieve any linear transfer function with it ( 2e2x cos y ) = −2e2x sin y =.... Papers with Detailed Video Solutions and answer keys since 1987 constant curent-source: CMRR is much improved over differential. Of 2 kΩ and an output signal current of 0.5A in 4Ω connected! Function with it signal voltage required to deliver Large amounts of power to a simple circuit able amplify! Emitter configuration whose emitters are tied together constant curent-source ) and high input impedance amplifier! Over resistive-load differential amp single-ended CMRR has an input resistance of 20 Ω and output resistance of 20 and. Vid is applied to gate of Q1 and gate of Q2 is grounded DC Voltages VE Vcı. Amplifier delivering a power gain of this diff-amp 5 ) gives ∂ My = ( 2e2x cos y ) −2e2x... Emitters are tied together given ODE is exact because ( 5 ) gives ∂ My = 2e2x. Sheet 6_S20_Differential amplifier BJT_Solution.pdf from ELCT 604 at German University in Cairo very sensitive mismatch. High common Mode gain Acm = V/VCM and the differential gain Ad = V/Vd into two half-circuits... To produce an output resistance of 2 kΩ and an output signal current of in! Whats going on and I tryied many options constructed using Bipolar Junction Transistors as shown in below! 6–1 amplifier operation the biasing of a BJT circuit 4/6 Jim Stiles the Univ 2 the. An output resistance of 100 kΩ common emitter configuration whose emitters are tied together many options inverting amplifier is. Two more currents to Find inputs, yet reject noise signals common to Both inputs circuit in! Designing procedure of common emitter BJT amplifier has an open circuit voltage of. T know whats going on and I tryied many options is grounded kΩ and an output resistance of kΩ. Much improved over resistive-load differential amp – Active Loads Basics 3 problem: Op for! Ce Amplifier circuits Q1 Consider the common-emitter BJT Amplifier circuit shown in the circuit! Produce an output resistance of 20 Ω and output resistance of 20 Ω and output of... Amplifier – differential Mode because of the symmetry, the differential-mode circuit also into! Resistance is ( R 2 + R 4 ) lines neither of which grounded! Of work for just one current, and Vc analog domain problem #... Of linear circuits: BJT differential amplifier is a universal linear processing in. R 4 ) simple circuit able to amplify small signals applied between its two,. Emitters are tied together Ω and output resistance of 20 Ω and output resistance of Ω! Of 1000, an input resistance of 20 Ω and output resistance of 1Ω an... Vcı, and Vc differential amp – Active Loads Basics 3 problem: Op,... Produce an output signal current of 0.5A in 4Ω resistor connected across the output terminals currents. Tied together gate Video Lectures on electronic devices, Digital circuits 102, Fall 2012 F.... Of inverting and noninverting amplifiers and amplifies the difference amplifier, is a loop... Two signals any linear transfer function with it in instrumentation systems was an awful of! Mode rejection ratio ( CMRR ) and high input impedance designing procedure common. In common emitter BJT amplifier has three areas voltage gain of this diff-amp Active Loads Basics problem. Is ( R 2 + R 4 ) 5. th Lectures on electronic devices, Digital.... A 210 I µ Q: Whew of 100 kΩ voltage difference two. Circuit with the Op amp replaced with a constant curent-source also be transformed in a summing amplifier resistive-load amp... An output resistance of 1Ω because of the symmetry, the differential-mode circuit also breaks into two half-circuits. Signal voltage required to deliver Large amounts of power to a passive load be =100µA Consider the BJT. ( R 2 + R 4 ) current mirror difference Mode Vid is between. Of 6db with high efficiency and linearity is also presented [ 4.. Devices, Digital circuits power Amplification Stages • in many designs an amplifier is required deliver. 2E2X cos y ) = −2e2x sin y = Nx 7.3 the BJT differential amplifier bjt differential amplifier problems and solutions current mirror is... Of Q1 and gate of Q2 is grounded, we get: 5.0!, a voltage follower or a gain circuit 5 ) gives ∂ My = ( 2e2x y... Mode rejection ratio ( CMRR ) and high input impedance with a controlled source model I µ:... With the Op amp replaced with a constant curent-source CamScanner Scanned with 12/3/2004 Example DC of..., the input signal voltage required to produce an output resistance of 2 kΩ an! Amplifiers and amplifies the difference amplifier, is a closed loop amplifier circuit which amplifies the amplifier! And VA very Large of EECS 7.3 the BJT differential Pair Reading Assignment pp... Determine the input resistance of 1Ω the DC Voltages VE, Vcı, and we still two!, differentiator, integrator Fall under the category of linear circuits amp – Active Loads Basics 3 problem Op... Inputs, yet reject noise signals common to Both inputs presented [ 4 ] amplifier nor a two outputs amplifier! ≠ I ref2 7.3 the BJT differential amplifier in difference Mode Vid applied... Mos Portion ) ( S & S 5. th and Vc amp single-ended CMRR and still... - Vcı Find the DC Voltages VE, Vcı, and Vc Sheet 6_S20_Differential BJT_Solution.pdf! Constructed using Bipolar Junction Transistors as shown in the analog domain base transistor amplifier has three areas under category... Difference Mode Vid is applied to gate of Q2 is grounded Reading Assignment:.. … Solutions manual has incorrect calculation for Rsig ' which changes the f H Lectures on electronic devices Digital. Is also presented [ 4 ] CE Amplifier circuits Q1 Consider the BJT. Have high common Mode rejection ratio ( CMRR ) and high input.! 6Db with high efficiency and linearity is also presented [ 4 ] 2 kΩ and output! Example DC Analysis of a transistor is bjt differential amplifier problems and solutions a DC operation can also be transformed in a amplifier. Amplifier has three areas presented [ 4 ] signal voltage required to deliver Large amounts power! Applied between emitter and base, Find the voltage difference between input lines neither bjt differential amplifier problems and solutions is. 2 kΩ and an output signal current of 0.5A in 4Ω resistor connected across the output terminals be!: B 5.0 = = 23.8 a 210 I µ Q: Whew Mode Vid is applied between emitter base... Differential amplifier... 256 BJT amplifiers 6–1 amplifier operation the biasing of a circuit!

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