Calibrating time-interleaved switched-capacitor track-and-hold circuits and amplifiers

A method for addressing errors in time-interleaved sampling networks, comprising:

• injecting an additive dither and a multiplicative dither in each time-interleaved sampling network, each time-interleaved sampling network sampling an input signal in a sequence;
• quantizing outputs of the time-interleaved sampling networks to generate a digital output;
• updating different correction coefficients for a first time-interleaved sampling network based on the additive dither, using samples of the digital output generated according to different values of the multiplicative dither;
• and
• correcting the digital output corresponding to the different values of the multiplicative dither separately, using the different correction coefficients.

A system with calibration, comprising:

• track-and-hold circuit to receive an analog input, wherein the track-and-hold circuit comprises randomized time-interleaved sampling networks, and each time-interleaved sampling network has additive dither injection circuitry;
• analog-to-digital converter to digitize an output from the track-and-hold circuit;
• and
• digital calibration logic to:
• determine different correction coefficients separately using samples of a digital output from the analog-to-digital converter generated according to different orders in which the randomized time-interleaved sampling networks sample the analog input, and
• correct a digital output from the analog-to-digital converter using the different correction coefficients.