How does the voltage controlled oscillator of application note AN-74 function?
The voltage-controlled oscillator of Figure 17 in application note AN-74 uses a classic approach of an integrator followed by a comparator and automatic reset circuit. The comparator on the left, Comparator 1, is used in an integrator configuration, producing a triangle waveform at a rate proportional to the input voltage. The comparator on the right, Comparator 2, detects whether the integrator output is above or below a mid-supply-voltage reference, converting the triangle wave to a square wave. When the inverting input of Comparator 2 is high and the output of Comparator 3 is off, capacitor C1 is charged through the 100KΩ resistor R1, ramping Comparator 1 output, or Vtri, down. When Vtri reaches about Vcc/2, Comparator 2 output goes low and Comparator 3 output turns on (sinking current). This causes the capacitor to discharge through the 50KΩ resistor R2, ramping Vtri up. When the Vtri reaches Vcc/2 again, Comparator 2 output goes low and turns off Comparator 3 output, causing the p
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