Published:2011/7/7 21:52:00 Author:Lucas | Keyword: Voltage conversion , frequency conversion | From:SeekIC
In the circuit, the AI and Rl, R2, Cl, etc. constitute a Miller integrator. Al's triangle wave output can drive level for the comparator. As the clamping effect of VD2, A2 outputs high level in about 0.7 V, low level in about -6V. A2's noninverting input added the feedback voltage is about half of the output voltage, so the upper trip point is about +0.3V, the lower trip point is about -3V. Al outputs triangle wave which is back and forth between +03 to -3V. When A2 outputs low level, VT1 gate voltage is negative and cut-off, R1 + R2 and C1 integrate on 2/3Ui.
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