Principle of voltage and frequency proportional conversion circuit
The voltage and frequency (proportional) conversion circuit is shown in the figure. The switched capacitor filter (SCF) is used as the feedback component. The reverse input terminal of the operational amplifier A1 is negative and the input terminal is positive. The output of A1 is connected to pin 16 of A2. When pin 16 is positive voltage, pin 12 of A2 is shorted to pin 13 and pin 14 is disconnected from pin 12, then C4 receives a negative 2.5V (DW) reference voltage. Instantaneous charging, while capacitor C1 at the inverting input of A1 is charged. When the voltage at the inverting input of A1 is greater than 0V, the output of A1 is negative, then the 12th and 14th pins of A2 are shorted. C4 is a negative voltage charge, suppressing the voltage of C1 to a negative voltage. Repeat the above operation to produce continuous oscillation.
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