What is the frequency of the output signal in Fig. 36-26?
Question 36.8: What is the frequency of the output signal in Fig. 36-26?
The feedback fraction is
B=\frac{18k\Omega }{20 k\Omega }=0.9With 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 kHzThe 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.
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