| 摘要 |
An automatic adjustment circuit for adjusting the time constant of a filter circuit, which receives a reference signal having a predetermined voltage and a clock signal. The adjustment circuit includes an integration circuit for generating an integrated signal having a variable voltage level with periodic peak values, which includes a controllable current generating circuit, a capacitor coupled for charging a current from the controllable current generating circuit and a switch for alternately charging and discharging the capacitor in response to the clock signal, a comparator for comparing the peak value with the reference voltage and generating a control signal for adjusting the time constant of the filter circuit and a feedback circuit coupled between the comparator and the controllable current generating circuit for automatically controlling the control signal.
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