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5. Two stage amplifier The transistors in the circuit below are identical and have ẞ = 50 and VBE 0.8 V in forward bias. Ignore the Early effect and use VT = 25 mV. The circuit consists of two common-emitter amplifiers hooked together. 4 V +4 V 4 V + 4 V 100 90 k 500 ww 90 k WW 2 k 500 w w Vout Vsig a) Calculate the small-signal gain A, the input resistance Rin, and the output resistance Rout for a single stage. b) Calculate the overall gain of the circuit. Do the calculation in two parts. First calculate the system gain of the first stage G₁ using the input resistance of the second stage as the load. Then calculate the system gain of the second stage G2 using the output resistance of the first stage as the signal source resistance. The total gain is then G = G1G2. Note that all capacitors are large so that their impedance is negligible at signal frequencies of interest. npn equations active Ic Ise VBE/VT = IB = (Is/B)eVB VBE/VT IE = (Is/α)еVB VBE/VT Ic=ẞIB_IС = αIE B α α = B = B+1 1-α Ic α Im Υπ re To= VT 9m Im 550 VA

5. Two stage amplifier The transistors in the circuit below are identical and have ẞ = 50 and VBE 0.8 V in forward bias. Ignore the Early effect and use VT = 25 mV. The circuit consists of two common-emitter amplifiers hooked together. 4 V +4 V 4 V + 4 V 100 90 k 500 ww 90 k WW 2 k 500 w w Vout Vsig a) Calculate the small-signal gain A, the input resistance Rin, and the output resistance Rout for a single stage. b) Calculate the overall gain of the circuit. Do the calculation in two parts. First calculate the system gain of the first stage G₁ using the input resistance of the second stage as the load. Then calculate the system gain of the second stage G2 using the output resistance of the first stage as the signal source resistance. The total gain is then G = G1G2. Note that all capacitors are large so that their impedance is negligible at signal frequencies of interest. npn equations active Ic Ise VBE/VT = IB = (Is/B)eVB VBE/VT IE = (Is/α)еVB VBE/VT Ic=ẞIB_IС = αIE B α α = B = B+1 1-α Ic α Im Υπ re To= VT 9m Im 550 VA

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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5. Two stage amplifier The transistors in the circuit below are identical and have ẞ = 50 and VBE 0.8 V in forward bias. Ignore the Early effect and use VT = 25 mV. The circuit consists of two common-emitter amplifiers hooked together. 4 V +4 V 4 V + 4 V 100 90 k 500 ww 90 k WW 2 k 500 w w Vout Vsig a) Calculate the small-signal gain A, the input resistance Rin, and the output resistance Rout for a single stage. b) Calculate the overall gain of the circuit. Do the calculation in two parts. First calculate the system gain of the first stage G₁ using the input resistance of the second stage as the load. Then calculate the system gain of the second stage G2 using the output resistance of the first stage as the signal source resistance. The total gain is then G = G1G2.
Transcribed Image Text:5. Two stage amplifier The transistors in the circuit below are identical and have ẞ = 50 and VBE 0.8 V in forward bias. Ignore the Early effect and use VT = 25 mV. The circuit consists of two common-emitter amplifiers hooked together. 4 V +4 V 4 V + 4 V 100 90 k 500 ww 90 k WW 2 k 500 w w Vout Vsig a) Calculate the small-signal gain A, the input resistance Rin, and the output resistance Rout for a single stage. b) Calculate the overall gain of the circuit. Do the calculation in two parts. First calculate the system gain of the first stage G₁ using the input resistance of the second stage as the load. Then calculate the system gain of the second stage G2 using the output resistance of the first stage as the signal source resistance. The total gain is then G = G1G2.
Note that all capacitors are large so that their impedance is negligible at signal frequencies of interest. npn equations active Ic Ise VBE/VT = IB = (Is/B)eVB VBE/VT IE = (Is/α)еVB VBE/VT Ic=ẞIB_IС = αIE B α α = B = B+1 1-α Ic α Im Υπ re To= VT 9m Im 550 VA
Transcribed Image Text:Note that all capacitors are large so that their impedance is negligible at signal frequencies of interest. npn equations active Ic Ise VBE/VT = IB = (Is/B)eVB VBE/VT IE = (Is/α)еVB VBE/VT Ic=ẞIB_IС = αIE B α α = B = B+1 1-α Ic α Im Υπ re To= VT 9m Im 550 VA
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