A first-order circuit, having a gain of 10 at dc and a gain of 1 at infinite frequency, has its pole at 20 kHz. Find its transfer function.

A first-order circuit, having a gain of 10 at dc and a gain of 1 at infinite frequency, has its pole at 20 kHz. Find its transfer function. a. (s + 4pi x 105) / ( s + 4pi x 104) b. (s + 4pi x 104) / ( s + 4pi x 103) c. (s + 2pi x 105) / ( s + 2pi x 104) d. (s + 2pi x 104) / ( s + 2pi x 103)

Microelectric Circuits 21

Please check my work and if incorrect give me the correct answer 21 A common-source FET amplifier utilizes a resistance Rs of 2 k ohm bypassed by a capacitor Cs. It is found that the pole and zero due to Cs are at 100 rad/s and 10 rad/s, respectively. Find the value of Cs. a. 25 µF b. 50 µF c. 75 µF d. 100 µF My solution Cs=100 rad/s=100microF

Microelectric Circuits 22

(See attached file for full problem description) --- For the circuit shown below, Rs = 4 k ohms, R1 = 8 k ohms, R2 = 4 k ohms, Re = 3.3 k ohms, Rc = 6 k ohms, Rl = 4 k ohms, and Vcc = 12 V. gm = 45 mA/V, Cpi = 12.8 pf, Cµ = 2 pf, R'L = 2.6 k ohms. Use the Miller-effect method to determine the dominant high-frequency pole. --- My answer: Rs=4K R1=8K R2=4K Re=3.3 Rc=6K R1=4K Vcc=12V gm=45mA/V Cpi=12.8pf Cmu=2pf R'L=2.6K Cin=2+12.8*(1+45*2.6) Cin=228.23 Answer is A

Microelectric Circuits 23

Please check my work and if incorrect give me the correct answer Please refer to the problem stated in the attached file. (The noninverting op-amp circuit shown below has the following characteristics: open-loop gain A has a low-frequency value of 105 and a uniform -6db/octave rolloff at high frequencies with a 3-dB frequency of 100 Hz. Find the low-frequency gain of a closed-loop amplifier with R1 = 2 k ohm and R2 = 8 k ohm.) My answer: A=10^5 R1=2K R2=8K =(-R2/R1)/(1+(1+R2/R1)/A) =(18/2)/(1+(1+8/2)/10^5 =-4/(1+5/10^5) =-3.9998 Answer is C

Microelectric Circuits 24

Please check my work and if incorrect give me the correct answer Please refer to the problem stated in the attached file. (The op-amp shown below has a uniform -6dB/octave high-frequency rolloff with f 3db = 2 kHz. A = 5000 V/V, R1 = 1 k ohm and R2 = 1 megohm. Find the 3-dB frequency of the closed-loop gain Vo/Vs.) Solution: 2KHz W=2Khz A=5000V/V R1=1KOhm R2=1MOhm=1000KOhm Find 3dB Closed Loop Gain G=A*f3dB*R1/R2= 5000*2*1/1000=10kHz Answer is A