Question

4. For the oscillator circuit shown below, the amplifier is an with trans-resistance gain Rm Vo frequency of oscillator and m
0 0
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Answer #1

Vout 2C

The feedback circuit becomes, as shown above, assuming the input impedance of the transresistance amplifier is 0.

Feedback,

Vout Vout tot = R + 1/sC + R111/2sC Vout sC Vout sC SC

In the frequency domain,

juc

So to satisfy Barkhausen criteria, the phase of feedback must be zero. Hence

V2RC

Which is the oscillating frequency.

And for the oscillations to sustain, loop gain A*beta >1. Hence,

R_m*\beta > 1

At the oscillation frequency,

4R 4R 4R

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4. For the oscillator circuit shown below, the amplifier is an with trans-resistance gain Rm Vo frequency of oscillator and minimum trans-resistance gan (15pts) (Hint: ideal tr short the input te...
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