Automatic frequency calibration circuit for realizing active RC (Resistance Capacitance) filter by utilizing capacitance delay characteristics
An automatic frequency calibration and filter technology, applied in the direction of electrical components, output stability, etc., can solve problems such as cut-off frequency drift of active RC filters, and achieve the effect of preventing the influence of the circuit
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 Such as Figure 1 to Figure 3 As shown, the present invention uses the capacitor delay characteristic to realize the automatic frequency calibration circuit of the active RC filter, and the schematic diagrams of the structure of the delay unit circuit and the charging current source circuit.
 An automatic frequency calibration circuit for realizing an active RC filter by utilizing the delay characteristic of a capacitor, comprising a delay unit 2 and a digital part 1, wherein the capacitor array 21 in the delay unit 2 completely replicates the capacitor array 21 in the active RC filter circuit B Capacitor array B1, and both have the same control word signal S; the frequency division signal S_IN generated by the digital part 1, after the delay function of the delay unit 2, obtains the delay signal S_OUT, which is fed back to In the digital part 1, the counter 12 counts during this delay time, and compares the obtained count with the expected reference count windo...
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