Midterm solution F2010A

# Midterm solution F2010A - Problem 1(25 pts In the circuit...

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Problem 1 (25 pts.) In the circuit shown, G m = 3 mA/V. Show all work. Circle your final answers. a) Find the DC overall voltage gain. b) Indicate the type of frequency response. c) Determine the 3dB corner frequency in Hz. a) Find the DC overall voltage gain. kohm 10 3 ohm := vo 50k 50k 7k + Gm vi 7 k = Mohm 10 6 ohm := vi 1M 1M 200k + vs = Gm 3 mA V := Av vo vs = 1M 200k + 50k 7 k 50k 7k + Gm = V V Av 1Mohm 1Mohm 200kohm + 50kohm 7 kohm 50kohm 7kohm + Gm := Av 15.351 = b) Indicate the type of frequency response. Low pass (LP) c) Determine the 3 dB corner frequency in Hz. ω 3dB 1 200kohm 1 Mohm 200kohm 1Mohm + 1 pF :=

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By KVL, vin - ii*2M-ii-2M=0 Rin vin ii = Since the current into the ideal opamp is zero, b) What is the input resistance seen by the source? V/V G 10.5 = G 1 2 1 R2 R1 + := G vout vin = 1 2 1 R2 R1 + = vin 2 1 R2 R1 + vout = v2 1 R2 R1 + vout = v2 vout () R2 v2 R1 = Since i1=i2, i2 v1 vout R2 = v2 vout R2 = i1 0v 1 R1 = v2 R1 = For ideal opamp, v1 = v2. v2 2M + vin = vin 2 = R2 20kohm := R1 1kohm := a) Assuming an ideal opamp, determine the closed loop gain. Problem 2 (25 pts.)Consider the following circuit. Parts (a) and (b) assume an ideal opamp. Parts (c) and (d) refer to the datasheet for a uA741 opamp. Show all work. Circle your final answers.
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Midterm solution F2010A - Problem 1(25 pts In the circuit...

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