| CPC H03K 21/08 (2013.01) [H03K 17/687 (2013.01)] | 8 Claims |
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1. A counting circuit comprising a charge counter module, a voltage comparison module and a signal processing module, the charge counter module comprising a pulse processing module and a first capacitor,
the pulse processing module comprising a first circuit, a second circuit and a current mirror, the first circuit comprising a first transistor and a resistor, the second circuit comprising a second transistor, the first circuit connected to the second circuit via the current minor, the first transistor configured to convert a received pulse signal into a first current, the current minor configured to minor the first current to a second current, the second transistor configured to convert the second current into a counting current and transfer the counting current to the first capacitor, the second current having an effective value present at a ratio of equal to 100 or greater to an effective value of the counting current,
the first capacitor configured to receive the counting current and store charge carried by the counting current, the counting circuit taking a voltage of the first capacitor as a basis for counting,
the voltage comparison module comprising a first input unit and a second input unit, the first input unit configured to receive the voltage of the first capacitor, the second input unit configured to receive a preset reference voltage, the voltage comparison module configured to output a trigger signal in the event of the voltage of the first capacitor rising beyond the preset reference voltage,
the signal processing module configured to convert the trigger signal into a stop signal to realize a counting cycle.
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