Electrical Engineering: Principles & Applications (7th Edition)
7th Edition
ISBN: 9780134484143
Author: Allan R. Hambley
Publisher: PEARSON
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Textbook Question
Chapter 11, Problem 11.26P
In an amplifier circuit, why do we need to bas the MOSFET at an operating point? What would happen if the signal peak amplitude was smaller than 1V, the transistor had
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In an amplifier circuit, why do we need to bias the MOSFET at an operating point? What would happen if the signal peak amplitude was smaller than 1 V, the transistor had Vto=1 V and we biased the transistor at VGSQ = 0.?
A MOSFET common-source amplifier must amplify a sinusoidal ac signal with a peak amplitude of 0.4 V. What is the minimum value of VGS −VT Nfor the transistor? If a voltage gain of 26 dB is required, what is the minimum power supply voltage?
(a) Suppose υbe(t) = 0.005 sin 2000πt V in the bipolar amplifier as shown . Write expressions for υbe(t), vce(t), and υCE(t). (b) What is the maximum value of IC that corresponds to the active region of operation?
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Electrical Engineering: Principles & Applications (7th Edition)
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- The common-emitter amplifier given in the figure in the circuit, Vcc=9V, R1=27kΩ, R2=15kΩ, RE=1.2kΩ and RC=2.2kΩ. Transistor β=100 has value. a-) If it has values of Rsig=10kΩ and RL=2kΩ Calculate the IE of the amplifier. b-) For small signal analysis of transistor Find the value of Rin by deriving the π-model c-) Calculate vo/vsig and io/ii.arrow_forwardIn 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.arrow_forward(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.arrow_forward
- A MOSFET common-source amplifier must amplify a sinusoidal ac signal with a peak amplitude of 0.2 V. What is the minimum value of VGS −VT N for the transistor? If a voltage gain of 33 dB is required, what is the minimum power supply voltage?arrow_forwardThe multistage amplifier circuit of Figure Q.2(b) have the following parameters:Q1 and Q2 : β = 200, VBE = 0.7 V, VT = 26 mV , VA = ∞Given that ICQ1 = 2 mA and VCEQ1 = 2 V. (i) Determine the value for RB4. List the assumption/approximation made in the analysis.(ii) Sketch and label the small-signal hybrid-π equivalent circuit at midbandfrequency range.(iii) Calculate the small signal hybrid-π model parameters: gm and rπ for Q1 and Q2. Then, determine Zi2 and Zo.arrow_forwardIn the common emitter amplifier, R1 = 50Ω, R2 = 1kΩ, and CL=1 pF. Determine the quiescent collector current, ICQ, needed such that the unity gain frequency, fu, = 1 GHz. Show your complete solution and state all your assumptions.arrow_forward
- Given the BJT bias circuit given below, solve for I_E, I_B, I_C, V_O, and β using the circuit parameters given in Table 1. Determine and verify the operating region of the BJT transistor. Draw the small-signal model of the circuit and solve for the small signal parameters rπ, gm, and ro. Let R_C = 12kΩ, R_B = 30kΩ, R_E = 2.5kΩ, and V_A = 50V. V_EB = 0.8V V_CC = 0V V_EE = -25V I_RC = 1.65mAarrow_forwarda) Differentiate between Common Emitter (CE), Common Collector (CC) and Common Base (CB) amplifiers. b) Do the DC Analysis of the circuit below and find out the DC collector voltage?c) Do the AC Analysis of the circuit below and find out the AC collector voltage?R1=30kΩΩ=610Ωarrow_forwardWhat power is being dissipated by the MOSFET as shown? What is the total power being supplied to the amplifier? Use the Q-point information given earlier (241 μA, 3.81 V).arrow_forward
- If RF = 50kΩ, R1 = 500kΩ and signal input is 15mV peak in a non-inverting operational amplifier, what will be the Vout value?arrow_forwardA bipolar transistor must be selected for use in a common-base amplifier with a gain of 40 dB and a bandwidth of 40 MHz. What should be the minimumspecification for the transistor’s fT ? What should be the minimum rxCμ product? (Use a factor of 5 safety margin for each estimate.)arrow_forwardVs=100 mV peak-to-peak, 1 kHz sine signal, Kn=0.4mA/v^2 ,Vt=1V , λ=0.01V^-1 Make the DC analysis of the above given mosfet amplifier circuit. Simulation to tableWrite down the measured values and mathematical calculation results. (The valueswith the units.)DC Parameters ,Measured value ,Calculated ValueVGETCVGSVDVDSIDb. Draw the small signal model for the AC analysis of the circuit. Find the gm, ro, Av values.c. Show the Vs input signal and the Vo output signal of the circuit on the oscilloscope. Volt/div of channels andSpecify time/div values.arrow_forward
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