ECE 65 University of California San Diego Engeneering Worksheet finish question 1-6you dont need to do 7show all work………………………. ECE 65 Sp

ECE 65 University of California San Diego Engeneering Worksheet finish question 1-6you dont need to do 7show all work………………………. ECE 65 Spring 2020 – HW 3
Due: 6/5/2020 at 11:59 pm (submit to Gradescope)
Problem 1.
Design the below circuit so that the transistor operates in saturation with biased 1-V from the
edge of the saturation, with = 1 , and = 3 . Use a 10 current in the voltage
divider. | | = 1 and = 0.5 / 2.
Problem 2.
In the following circuit, solve the Bias circuit, find the small signal parameters and draw the
signal circuit (assume capacitors are short for signal). Solve the small signal circuit to find the
total circuit gain ( / ).
= 0.6 , = 5 / 2. = 60 . = 26 . Ignore the channel-length modulation
effect in biasing calculations.
Problem 3.
The BJT in the below circuit has = 100, = 0.7 , = ∞. Find the DC collector current
and the DC voltage at the collector. Draw the signal circuit.
(assume capacitors are short for signal).
Problem 4.
In the following circuit, BJT has = 100, 0 = 0.7 , = ∞, = 25 .
a) Find the value of to establish a dc emitter current of 0.5 mA.
b) Find the value of to establish a dc collector voltage of 0.5 V.
c) Draw the signal equivalent circuit and find the small signal parameters.
d) Find the input and output resistances and the open loop voltage gain of the transistor.
e) If = 100 kΩ, determine the total circuit gain (A).
Problem 5.
A common-source amplifier uses a MOSFET operated at = 0.25 . The amplifier feeds a
load resistance = 15 Ω. The designer selects = 2 . Assume = ∞.
a) If it is required to realize a total circuit gain of −10 / , what is needed?
b) Calculate the bias drain current?
c)
If, to increase the output signal swing, is reduced to = , how does change?
Problem 6.
Consider the following amplifier circuit operated with a supply voltage = +3 . Assume
= 100, 0 = 0.7 , = ∞, = 25 , = 0.3 , 0 = 0.7 .
a) What is the maximum voltage gain that this amplifier can provide?
b) What value of must this amplifier be biased at to provide a voltage gain of
−60 / ?
c) To have a DC collector current of 0.5 mA, what resistor value should be used?
d) If a sine-wave signal having a 5-mV peak amplitude is superimposed on , find the
corresponding output voltage signal that will be superimposed on assuming
linear operation around the bias point.
e) Find ( ).
f) Find and ( ).
g) Sketch and label the graphs of ( ), ( ), ( ), ( ) .
Problem 7.
Choose a problem related to the topic of transistor amplifiers from the reference notes, or the
textbook or the problem-solving videos, or other resources and include both the problem and
your solution to the selected problem.

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