| 摘要 |
A method for RC time constant tuning includes biasing a reference resistor and charging a reference capacitor, transmitting a start signal to a counter when beginning charging, inputting the results of biasing and charging to a comparator for comparing, and sending a stop signal to the counter when the result of the comparison conforms to a predetermined rule, counting a number of clock cycles received by the counter from the time of receiving the start signal to the time of receiving the stop signal, and deciding a number of resistors or a number of capacitors utilized by an RC filter according to the number of the clock cycles received by the counter.
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