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Professors HW1 Solutions

# Professors HW1 Solutions - EE323 Homework 1 Solution...

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EE323 Homework 1--- Solution, Au/2004 2.8 (25 points) (a) Voltage gain: / 2 1 100 10 10 VV o i V R VR =− Input impedance: 10 K in R = (b) The 10Kohm resistor has not impact on the voltage gain and input impedance. Voltage gain: / 2 1 100 10 10 o i V R Input impedance: 10 K in R = (c) Voltage at the virtual ground is 0, so there is no current flowing through the resistor between the virtual ground and ground. Voltage gain: / 2 1 100 10 10 o i V R Input impedance: 10 K in R = (d) Voltage gain: / 2 1 100 10 10 o i V R Input impedance: 10 K in R = 2.12 (25 points) For an ideal op amp, voltage gain is 2 1 o i V R . Note that resistor should be at least 10 K . A set of possible solutions are: (a) 12 10 R RK == (b) 10 , 20 R KR K =Ω (c) 20 , 10 R K (b) 10 , 1000 1 R K M = = 2.49 (25 points) Let V + and V denote the voltage at the positive input terminal and negative input terminal, respectively. Note 3 R and 4 R work as a voltage divider, such that: 4 34 i R V RR + = = + The current flowing through resistors 1 R and 2 R is the same and equal to: 11 i R R +

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Professors HW1 Solutions - EE323 Homework 1 Solution...

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