Modern Physics II Assignment
1.) Determine the voltage gain, Av, of the circuit below.
2.) Determine the voltage gain of the circuit below. Calculate Zin(base) and find Zin.
3.) Draw the ac equivalent circuit for the amplifier below. Calculate Av and Zin.
4.) Write an expression for the output voltage in terms of the input voltages for the
following circuit. (Hint: Use the Op-Amp Golden Rules.)
v1
v2
v3
v4
10kΩ
20kΩ
10kΩ
vout
10kΩ
10kΩ
5kΩ
5.) Determine the “truth table”, (the outputs for all combinations of digital inputs) for the
circuit below.
6.) As shown below it is possible to make a NOT gate out of a NAND gate. Construct
an AND and OR gate out of only NAND gates.
7.) Draw the schematic for an op-amp based inverting amplifier with a gain of 20.
8.) Draw the schematic for an op-amp based non-inverting amplifier with a gain of 20.
9.) The circuit below is known as a DAC or digital to analog converter. It takes a digital
or binary input and converts it to an analog voltage output. The inputs labeled D0, D1
and D2 correspond to the digits of a three-digit binary number with D0 being the least
significant digit and D2 the most significant digit. The high level (5.0 V) on an input line
corresponds to a binary digit of 1 while a low level (0.0 V) indicates a binary 0. For
example the binary number 110 would be represented on the input lines as 5.0 V on the
D1 and D2 lines and a 0.0 V signal on the D0 line. Complete the table below indicating
the output of the circuit for each binary number input.
200 kΩ
10 kΩ
D0
100 kΩ
D1
50 kΩ
D2
Input
Number
000
001
010
011
100
101
110
111
Output
Voltage
vout