2) For the amplifier below, g,mı = gm2 = 10 mS, Rg = 200 N, Rc = Rg = 5 kn, VA = 00, and B = 100 are given. Assume that both transistors operate in the forward active region, where Vg is a biasing voltage. Draw the small-signal diagram, find the mid- band transimpedance gain expression AR = Vout/lin of the amplifier, and calculate it in dBN. Vc Vcc Rc Q2 VB Q1 oVout RE lin Rs

2) For the amplifier below, g,mı = gm2 = 10 mS, Rg = 200 N, Rc = Rg = 5 kn, VA = 00, and B = 100 are given. Assume that both transistors operate in the forward active region, where Vg is a biasing voltage. Draw the small-signal diagram, find the mid- band transimpedance gain expression AR = Vout/lin of the amplifier, and calculate it in dBN. Vc Vcc Rc Q2 VB Q1 oVout RE lin Rs

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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Consider the amplifier shownbelow. (a) Draw the small signal equivalent circuit assuming that the capacitorsare short circuits for the signal.(b) Derive an expression for the voltage gain.(c) Find IDQ if R = 100kΩ, Rf = 100kΩ, RD = 3kΩ, RL = 10kΩ, VDD =20 V, Vto = 5 V, and K = 1 mA/V 2. Determine the value of gm at the Q point.(d) Is this amplifier inverting or noninverting?
(a) What are the Q-points for the transistors in the amplifier as shown if VDD =5V, VSS =5 V, RSS =2.4 kΩ, and RD =2.4 kΩ? Assume Kn =400 μA/V2 and VT N =0.7 V. (b) What are the differential-mode gain, common-mode gain, CMRR, and differential-mode and common-mode input resistances?
Consider the operational amplifier circuit shown below. Assume the operational amplifier in the circuit is ideal. Determine the expression for the output signal, Vout, in terms of Vin,R1 and R2. Given the expression of the circuit [above’s output signal is Vout =3 − 0.5Vin, what is the maximum and minimum voltage that the input signal can have before the operational amplifier saturates.
What are Aυ, Ai , Rin, Rout, and the maximum amplitude of the signal source for the amplifier shown if R1 = 20 kΩ, R2 = 62 kΩ, RE = 3.9 kΩ, RC = 10 kΩ, and VCC = 12 V? Use βF = 75. Compare Aυ to our rule-of-thumb estimateand discuss the reasons for any discrepancy.
Given the diferrential amplifier with a constant-current source at the emitter (instead of the resistor RE),Assume Q1, Q2, and Q3 are identical transistors with β=hfe=100 and VBE=0.7V. (a) Determine the common-mode gains Acs (for single-ended) and Acd (for double ended).For AC analysis: The constant current source has an infinite equivalent resistance.(b) Determine the common-mode rejection ratio CMRR for single-ended output.(c) Determine the common-mode rejection ratio CMRR for double-ended output.
In the common-emitter amplifier circuit shown in the figure, Vcc=9V, R1=27kΩ, R2=15kΩ, RE=1.2kΩ and RC=2.2kΩ. The transistor has β=100.a-) If Rsig=10kΩ and RL=2kΩ, calculate the IE value of the amplifier.b-) For small signal analysis of the transistor, find the value of Rin by deriving the π-modelc-) Calculate vo/vsig and io/ii.
Figure 2 shows a typical BJT amplifier, with its parasitic capacitances displayed. The current gain of the transistor is B=150 and the voltage gain of the amplifier is Am =-125. The small signal resistances of the transistor are re =16 ohm and r0 = infinity, respectively. The values of resistors and capacitors in the figure are: R1 =80 kohm, R2 =20 Kohm, Rc = 2 Kohm, RE = 2 Kohm, Rs =50 W, RI=5 kohm, Cs=2 uF, Cc=2 uF, Ce =10 uF, Cbc =4 pF, Cbe = 10 pF, Cce =1 pF, Cwi = 4 pF, CWO = 9 pF, and Vcc = 20 V. a) Sketch a simplified circuit diagram of Figure 2 for high frequency analysis. b) Using the concept of "Miller effect capacitance", calculate the input and Output Miller effect capacitances of Figure 2, respectively. C) Determine the upper cut-off frequency of Figure 2 that is imposed by its input network only. d) Explain briefly the possible ways to increase the upper cut-off frequencv of this amplifier.
(a) What are the Q-points for the transistors in the amplifier as shown if VCC = 15 V, VEE = 15 V, IEE = 400 μA, βF = 100, REE = 270 kΩ,RC =47 kΩ, VA=∞, and βF =100? (b) What are the differential-mode gain, common-mode gain, CMRR, and differential-mode and common-modeinput and output resistances? (c) Repeat part (b) for VA = 50 V.
The following Common Emitter (C.E.) amplifier is biased with a currentsource I. It has β = 100, VA = ∞, VT = 25mV, and rπ = 25kΩ. Draw the small signal equivalent circuit including the Hybrid-π with the βIb currentsource model. Label the input (Rin), output (Rout), and base (Rib) resistances. Find Rib, Rin, Rout, and the voltage gain (vo/vsig).
Consider the common-source amplifier shown in Figure P11.50. The NMOS transistor has KP=50 μA/V2, L=5 μm, W=500 μm, Vto=1 V and rd=∞.a. Determine the values of IDQ, VDSQ and gm. b. Compute the voltage gain, input resistance, and output resistance, assuming that the coupling capacitors are short circuits for the ac signal. Repeat Problem P11.50 for an NMOS transistor having KP=50 μA/V2, W=600 μm, L=20 μm, Vto=2 V and rd=∞. Compare the gain with that attained in Problem P11.50.
Suppose that the amplifier as shown has beendesigned to match the source and load resistanceswith the parameters below. (a) What is the amplitudeof the input signal vi needed to deliver 1 Wto the 16- load resistor? (b) How much power isdissipated in the amplifier when 1Wis delivered tothe load resistor?Input resistance Rin = 1 k Output resistance Rout = 16 A = 50 dB
Amplifier circuit is show below has a single ac input and one ac output. Assuming 2N2222 transistor: 1- Determine the Q point, then illustrate it on the transistor I-V characteristic curves. 2- Is the transistor in the active region? Explain thoroughly. 3- Construct the T-model of the transistor with all parameters labelled and evaluated. Assume room temperature. 4- Draw a complete small signal circuit model, then find the voltage gain. Explain two characteristics of this amplifier. 5- Calculate the current gain, the input resistance, and the output resistance.