![]() The AD639 must be supplied with a triangle wave which does not vary in amplitude or output distortion will result. The AD639 trigonometric function generator, biased via A4, converts A1’s triangle output into a sine wave (Trace D). The Schottky diodes bound C1’s “+” input, assuring it clean recovery from overdrive. The LT1009 diode bridge and the series-parallel diodes provide a stable bipolar reference which always opposes the sign of A1’s output ramp. The frequency of this triangle is dependent on the circuit’s input voltage and varies from 1Hz to 1MHz with a 0V to 10V input. ![]() The result is a triangle waveform at A1’s output. This switches the Q4-Q5 level shifter’s state, Q1 goes off and the entire cycle repeats. When A1 integrates far enough in the negative direction, C1’s “+” input crosses zero and its outputs reverse.
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