Calibration apparatus and method for programmable response frequency selecting elements

A calibration apparatus for programmable response frequency selecting elements, comprising:

• a basic reference source;
• a programmable counter, for generating different frequency signals required by different frequency selecting elements by programming said basic reference source according to said different frequency selecting elements' configured data input;
• a control logic unit, for generating a plurality of timing control signals according to said different frequency signals;
• and
• a frequency to time constant converter including a capacitor set having a plurality of capacitors, said frequency to time constant converter receiving said timing control signals, tuning said capacitor set according to a reference voltage and an input voltage, and determining a calibrated capacitance;
• wherein said frequency to time constant converter further includes:
• a transconductor and switching element, for receiving said input voltage, and sequentially charging and discharging said capacitor set;
• a comparator, for comparing the voltage of said charged capacitor set with said reference voltage;
• and
• a tuning logic unit, for determining whether each capacitor of said capacitor set is enabled after said comparison.