Published:2011/7/7 6:45:00 Author:Lucas | Keyword: Voltage conversion , frequency conversion | From:SeekIC
Al is used as voltage / current conversion circuit, which can convert 2V input voltage into lmA current charge for capacitor C1. As the voltage across the capacitor and changes in proportion with the time, so the voltage on the two ends of Cl will be equal the integral value of input voltage and time. A2 is the comparator. When Uc is lower than Us, the output jumps to near + l5V level, the diode VD2 is forward biased to make the transistor VT2 conduction. At the same time, the transistor VT3 is conduction, so the voltage of Uc resets in the constant of Cl and Rl.
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