Time interleaved analog to digital converter and signal conversion method

A signal conversion method, comprising:

• sequentially sampling, by a plurality of sampling circuits, an input signal to generate a plurality of first signals, wherein a circuit parameter of each of the plurality of sampling circuits is set according to a corresponding control signal in a plurality of control signals;
• generating a plurality of first digital codes according to the plurality of first signals;
• outputting a second digital code according to the plurality of first digital codes;
• and
• adjusting the plurality of control signals according to the second digital code, wherein adjusting the plurality of control signals according to the second digital code comprises:
• generating the plurality of control signals having a first set of values;
• determining a first performance indicator according to the second digital code corresponding to the first set of values;
• adjusting the plurality of control signals from the first set of values to a second set of values;
• determining a second performance indicator according to the second digital code corresponding to the second set of values;
• and
• determining the plurality of control signals according to the first performance indicator and the second performance indicator.

A time-interleaved analog-to-digital converter, comprising:

• a plurality of sampling circuits configured to sequentially sample an input signal to generate a plurality of first signals, wherein a circuit parameter of each of the plurality of sampling circuits is set according to a corresponding control signal in a plurality of control signals;
• a plurality of analog-to-digital converter circuits configured to generate a plurality of first digital codes according to the plurality of first signals;
• an output circuit configured to output a second digital code according to the plurality of first digital codes;
• and
• a calibration circuit configured to generate the plurality of control signals and adjust the plurality of control signals according to the second digital code,
• wherein the circuit parameter comprises at least one of a turn-on resistance or a capacitance of a corresponding one of the plurality of sampling circuits.