Scribd
Upload
135 views5 pages

Sheet (2) BJT

This document contains 10 problems related to analyzing transistor amplifier circuits. The problems involve calculating voltage and current gains, input and output resistances, and determining amplifier configurations using parameters like beta, input and output impedances, and voltage and current values. Calculations are required to solve for unknown component values, gains, and output voltages given specifics of the circuits and component parameters.

Uploaded by

drhammouda
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
135 views5 pages

Sheet (2) BJT

This document contains 10 problems related to analyzing transistor amplifier circuits. The problems involve calculating voltage and current gains, input and output resistances, and determining amplifier configurations using parameters like beta, input and output impedances, and voltage and current values. Calculations are required to solve for unknown component values, gains, and output voltages given specifics of the circuits and component parameters.

Uploaded by

drhammouda
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 5

Department of Electrical Engineering Electronics(II)

2nd year Electronics & Communications Sheet no.(2)


First Semester – 2017/2018

1- For the following circuit, find the input resistance Rin and the voltage gain and
the o/p voltage if vi = 10mv. Assume β = 100

-
2- Given : β = 100, VCC = 12V , RS = 0.5kΩ, RC = 6kΩ, R1 = 93.7kΩ, R2 =
6.3kΩ, Calculate the small-signal voltage gain?

3- If a transistor has the following parameters:- hfe =120, hie =2kΩ, hre =
10-4, hoe =20µs. is used for the common emitter to provide an input
resistance of 1.5 kΩ
(a) Determine the necessary load resistance RL?
(b) Calculate Av, Ai and Zout if the amplifier is driven by a 4mv
source having an internal resistance of 600Ω?
(c) Find the voltage across the load?

1
4- (a)- Select a minimum value for the emitter bypass capacitor, C2 in the
following Figure if the amplifier must operate over a frequency range
from 2 kHz to 10kHz.
(b)- Calculate the base-to-collector voltage gain of the above amplifier
both without and with an emitter bypass capacitor if there is no load
resistor. (re = 6.58 Ω)
(c)- Calculate the base-to-collector voltage gain of the amplifier in
the given circuit when a load resistance of 5 kΩ is connected to
the output. The emitter is effectively bypassed and re = 6.58 Ω.

5- Given : β = 100, VCC = 12V, RC = 6kΩ, RB = 50kΩ, and VBB = 1.2V


Calculate the small-signal voltage gain, current gain Ai, input resistance
Rin , output resistance Rout ?
.

Rin

2
6- For the following circuit and using β = 100,
i. Find the value of RE to establish a dc emitter current of 0.5mA.
ii. Find the value of RC to establish a dc collector voltage of 5V.
iii. Determine the overall voltage gain for RL = 10kΩ and ro = 200kΩ.

7- For the transistor network given below the h parameters are as follows:
hfe =80, hie =1.2kΩ, hre = 1.5×10-4 ,hoe =20µs. Determine the
following:-

(a) The voltage gain Av


(b) Current gain Ai
(c) Input impedance Zin
(d) Output impedance Zout

+
Ii
Io
Vo

3
8- For the shown amplifier using the hybrid parameter, determine:
(a) Z i
(b) Z o
(c) A v
(d) A i

9- For the shown amplifier determine the following :-


(a) The dc collector voltage
(b) The ac collector voltage
(c) Draw the total collector voltage waveform and the total output
voltage waveform.

4
10- For the given amplifier circuits, determine what is their configuration.

Then for circuit (a) do the following:


(a) Determine re and β re.
(b) Find Zi and Zo
(c) Calculate Av and Ai.

And for circuit (b) do the following:

a- Determine Zi and Zo.


b- Find Av
c- Calculate Vo if Vi = 1mv.

(a) (b)

You might also like