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Chapter 36

Q. 36.8

What is the frequency of the output signal in Fig. 36-26?

Step-by-Step

Verified Solution

The feedback fraction is

B=\frac{18k\Omega }{20 k\Omega }=0.9

With Formula (36-14), T=2RC \ln \frac{1+B}{1-B}

T=2RC \ln \frac{1+B}{1-B}=2(1 k\Omega )(0.1 \mu F)

 

\ln \frac{1+0.9}{1-0.9}=589 \mu s

The frequency is

f=\frac{1}{589 \mu s }=1.7 kHz

The square-wave output voltage has a frequency of 1.7 kHz and a peak-to-peak value of 2V_{sat}, approximately 27 V for the circuit of Fig. 36-26.