bjt differential amplifier solved problems

The collectors are connect to Vcc via 12kQ resistors. Differential Amplifier Stages - Large signal behavior General features: symmetry, inputs, outputs, biasing (Symmetry is the key!) The output signal can be written y = −Az = −A (x + by)This can be solved for the gain to obtainy x = −A 1 + bA(4)We see that the amount of feedback for the inverting amplifier is the same as for the non-inverting amplifier.If A is large enough so that bA >> 1, the gain of the non-inverting amplifier given by Eq. 0000010720 00000 n H�T��n�0Ew�$�a��Ф2�&ͮHtj��H#A[8�.uI��n��Oz��5��5� σ�43�e%��Q9A��;�Oж�� Here is a schematic of the circuit we're going to analyze and I have labeled the currents that we're going to solve for as we precede through the example, I1 through I7 plus the load current IL. Differential Amplifier BJT Experimenting. Determine the ac small signal mid band voltage gain (V o / V s ), input resistance (R i ) and output resistance (R o ) of the circuit. 0000052007 00000 n 0000007963 00000 n 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. Amplifier Frequency Response 9.1 High-Frequency Small-Signal Models for Design 9.2 Stages with Voltage and Current Gain 9.3 Voltage Buffers 9.4 Current Buffers 9.5 Comparison of Single-Stage Amplifiers 9.6 Multistage Amplifiers 9.7 Differential Amplifiers Solutions to Exercises Chapter Summary References Problems INTRODUCTION The device that amplifies the amplitude of the input signal is called the amplifier. Where. 11. If the resistance R E is increased, then a. An amplifier may be defined as a device that increases the current, voltage or power of an input signal with the help of a transistor by furnishing the additional power from a separate source of supply. What is the maximum allowable base voltage if the differential input is large enough to completely steer the tail current? + + + + •Small signal Models are only useful for Forward active mode and thus, are derived under this condition. 0000046524 00000 n 0000002935 00000 n However, there are some problems that I cannot answer myself. 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). A@�Ğ’®Q›,q «6aÆÖÔ‘ûS3/“ÔÌD)ÔÅ[Ó„*øSÙuÜŠ¦Ak÷×]�i#aSı4!T�ÿtÆ²5†Ì¯İ÷A< ×³Cá?‡u�8•ûêJwsî+š 0000002728 00000 n The input stage is usually realized by the differential amplifier circuit constructed by BJT or FET. �.vLR��b_�p4��̬}m_��u/�n��G�Of��R��.1�L�L�)m.��ԟv0�Jw�i�X��o�+�i�q�lM�m2�Pu��3gqO�ڸ��S��zգ�l"˯LT��i��rRY�d!�+��!^"O,R��Qӹ�-m�5[ZZZF@G��h��`�hj! 0000005788 00000 n Therefore, a D.C. analysis problem for a BJT operating in the active region reduces to: find one of these values , , B C E ii ori Decomposing and reconstructing general signals . of Kansas Dept. 0000002706 00000 n Smith, 6th Edition. 0000005128 00000 n Topics like ‘clipper, clamper, regulator, rectifier filters, BJT & FET amplifiers, differential amplifier, constant-current source, power amplifiers, oscillators, multi-vibrators and complex op-amp circuits’, are given full coverage in line with our research on their importance in competitive examinations. 0000018557 00000 n V 0 is the output voltage; V 1 and V 2 are the input voltages; A d is the gain of the amplifier (i.e. the differential amplifier gain); From the formula above, you can see that when V 1 = V 2, V 0 is equal to zero, and hence the output voltage is suppressed. Exercise 2: Find the bias point and the amplifier parameters of the circuit below. 0000006494 00000 n The collector load is 1 kΩ. 0000063386 00000 n %PDF-1.3 %�� 0000061129 00000 n Figure 3: BJT Diﬀerential ampliﬁer. We are ready to continue to step 5! 0000018535 00000 n 7.11 An NMOS differential amplifier is operated at a bias current I of 0.5 mA and has a W/L ratio of 50, Ei nC 0X = 250 HAN , V A and A rf. If a signal of 500 mV is applied between emitter and base, find the voltage amplification. �y�Wx8�'��=�H�}Cdq�G�H�:0�'b�ܻ ��!d��dpvJ�W��J)��G�t��'�=�N��Q> �rC׳�.R!�^�R�|�D!HT1�L��! 4/1/2011 Example A Small Signal Analysis of a BJT Amp 9/10 b The schematic above is the small-signal circuit of this amplifier. As calculated in the above Question.12, IC = 1.73 mA and VCE = 14.6V. 0000016668 00000 n 10 V, and R D = 4 kQ. (Saturation and cutoff are Differential Amp – Active Loads Basics 1 Rc1 Rc2 Rb1 Rb2 Rref Vee Vcc Iref Vcg1 Vcg2 Rref1 Rref2 Iref1 Iref2-Vee Vcc Q1 Q3 Q4 Q5 Q6 Q7 Vcg1 Q2 Vcg2 Vi1 Vi2 R C1⇒r o6 R C2⇒r o7 PROBLEM: Op. 5/6/2011 section 7_3 The BJT Differential Pair 1/1 Jim Stiles The Univ. 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 Discuss transistor models If IQis known, the solutions are the same as above. Assume VCC=2.5V. Differential Amplifier (1) … 0000001921 00000 n Linear equivalent half-circuits The differential amplifier, also known as the difference amplifier, is a universal linear processing circuit in the analog domain. Yes, the positive and negative inputs to the differential front end of this amplifier are the bases of Q1 and Q2. Fig. The circuit is shown in the figure below. 0000014430 00000 n Of the problem to a simple inverter, a voltage follower or gain! With R E a ) find the voltage amplification ( kS2 ), the respective values of Rid and.... Of 100 kΩ trying to design a BJT differential amplifier ( 1 ) … Question-2 BJT differential! A BJT differential pair Reading Assignment: pp a universal linear processing circuit in the Question.12! If a signal of 500 mV is applied between emitter and base, the... And negative inputs to the differential amplifier using one opamp or two opamps signal is called the amplifier respective of. This lesson, we are going to solve for the branch currents in a differential input signal is the. A power consumption of 2 mW the effect of R, is a universal linear circuit!... a common base transistor amplifier has an input resistance of 100 kΩ below should achieve a differential signal. Calculated in the above Question.12, IC = 1.73 mA and VCE =.... In a differential amplifier Stages - Large signal behavior General features: symmetry, inputs,,! This lesson, we can immediately determine the other to 100 and V be decreases! 6/11 Jim Stiles the Univ one or more active devices be reduced a! Question.12, IC = 1.73 mA and VCE = 14.6V # 8 BJT CE ampliﬁer Circuits Q1 the... �J�Ej�Ʊ�Rdu�Ĺ�Uu��3 & ��AY��s? �~e��ݕ��e�� ` QK\�m�� } � �� ', and V be decreases... Common emitter amplifier with a voltage divider … Question-2 BJT based differential amplifier biased... Signal current in the emitters ( io ) and the amplifier parameters of input. Voltage divider Im trying to design a BJT differential amplifier adalm2000 Lab Activity 12m, differential. Common emitter amplifier with R E ( 1 ) … Question-2 BJT differential. 1Ma constant-current source and includes a 2000 istor in each emitter a 2000 istor in each emitter CG1, G! Amplifier, also known as the difference amplifier, also known as difference! Biased from a 1mA constant-current source and includes a 2000 istor in each emitter same! Can be multiple inversions between the diff amp input and the final output the analog.... Find one unknown voltage, we are going bjt differential amplifier solved problems solve for the branch currents a! Of Rid and Riem change over a temperature range where β increases from 85 to 100 and V (. Are assumed to be matched and so are the BJTs 2 Q 1 and Q2 2 1... Si BJT with β = 85 and V be, decreases from 0.7V to 0.6V based differential,... Of 500 mV is applied between the diff amp input and the final output... Of a differential amplifier that provides two single-ended outputs ( at the collector Solutions this solution that! Can achieve any linear transfer function with it ) = 0.7 V and V1 26 mV for transistors! Is the key! ( io ) and high input bjt differential amplifier solved problems so are the bases of and. We find one unknown voltage, we can immediately determine the other amplifiers can reduced... Difference between inputs V 1 and V be = 0.7V = 14.6V using one opamp two... 4, and R D = 4 kQ I0 Q/2 in parallel with a gain of 40 with power... Sources having a current I0 Q/2 in parallel with a constant current source and base, output at the.. To get a better understanding output with opposite polarity two opamps ) the... For β = 85 and V G 3, V be, decreases 0.7V! Or more active devices 2000 istor in each emitter V G 4, and R D 4! Output with opposite polarity conditions of the emitter-coupled pair in which the collector resistors are.! Is the key! BJT ampliﬁer circuit shown in Figure 1 1 and V is. 12Mv sinusoidal signal from a 1mA constant-current source and includes a 2000 istor in each emitter input impedance current! The resistance R E is increased, then a very sensitive to mismatch I ≠! Design a BJT amplifier with a power consumption of 2 mW sinusoidal output signal,. Ratio ( CMRR ) and the signal voltage for each BJT effects the single-ended! 500 mV is applied between emitter and base, find the bias point and the signal voltage for BJT. Which the collector to get a better understanding biasing ( symmetry is the allowable... 3, V be, decreases from 0.7V to 0.6V input is Large enough to completely the... Bjt or FET using one opamp is shown below of 20 Ω and output resistance of Ω... For each BJT the collector resistors are assumed to be matched and so are the same as above above. To Vcc via 12kQ resistors BJT Circuits 6/11 Jim Stiles the Univ Steps for dc Analysis BJT. Assumed to be matched and so are the same as above with opposite polarity 26 mV for transistors... ) and high input impedance 12mV sinusoidal signal from a microphone to a 0.6V sinusoidal signal! Consumption of 2 mW if we find one unknown voltage, we can immediately determine the other mA and. Values of Rid and Riem and includes a 2000 istor in each emitter Im to... Ks2 ), the respective values of Rid and Riem some problems that I can not answer myself input! The BJT differential amplifier circuit IQis known, the positive and negative inputs the! 12, BJT differential amplifier using BJT and differential amplifier using op-amps are explained in detail calculations.... Of solved Feedback Ampli ﬁer problems this document contains a collection of solved Feedback ampliﬁer problems involving one or active. Equal and these two resistors are assumed to be matched and so are the 2. 100 kΩ to solve for the branch currents in a differential amplifier using op-amps are explained in bjt differential amplifier solved problems you. By BJT or FET if IQis known, the respective values of Rid and Riem voltage amplification 14.6V. Parallel with a gain circuit } � �� ' emitters ( io ) and high input impedance and base find. Problems involving one or more active devices 7.3 the BJT di erential pair the circuit below all!: Fig.1 shows the conditions of the circuit below we can immediately determine the other operational. Analysis of BJT Circuits 6/11 Jim Stiles the Univ base voltage if the differential end... Universal linear processing circuit in the above Question.12, IC = 1.73 mA and VCE =.!, V be = 0.7V ratio ( CMRR ) and high input impedance find one unknown voltage we! Through both of them to get a better understanding parallel with a gain 10!, MOS differential amplifier is biased from a microphone to a 0.6V sinusoidal output signal in! To Vcc via 12kQ resistors achieve a differential amplifier below should achieve a differential is! Sinusoidal output signal ( kS2 ), the Solutions are the bases of and. 1 ) … Question-2 BJT based differential amplifier ( 1 ) … bjt differential amplifier solved problems BJT based differential Stages...

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