US 12,231,140 B2
Mitigation of undesired spectral images due to bandwidth mismatch in time-interleaved A/DS by sampling capacitance randomization
Gabriele Manganaro, San Jose, CA (US)
Assigned to MEDIATEK INC., Hsinchu (TW)
Filed by MediaTek Inc., Hsin-Chu (TW)
Filed on Nov. 7, 2022, as Appl. No. 17/982,339.
Claims priority of provisional application 63/320,748, filed on Mar. 17, 2022.
Prior Publication US 2023/0299784 A1, Sep. 21, 2023
Int. Cl. H03M 1/12 (2006.01); H03M 1/10 (2006.01)
CPC H03M 1/1245 (2013.01) [H03M 1/1009 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A time-interleaved (TI) analog-to-digital converter (ADC), comprising:
an input terminal;
a set of N paths electrically coupled to the input terminal, each path comprising a sampler configured to sample an input signal appearing at the input terminal, wherein N is a positive integer, wherein the N paths result in a phase oscillation of the input signal as appearing at the samplers, wherein the phase oscillation presents at most N phase values, and wherein the phase oscillation oscillates in accordance with a first periodicity; and
control circuitry configured to control at least some of the N samplers to modify the phase oscillation of the input signal so that the modified phase oscillation presents more than N phase values, and the modified phase oscillation oscillates in accordance with a second periodicity greater than the first periodicity;
wherein controlling the at least some of the N samplers to modify the phase oscillation of the input signal comprises controlling the at least some of the N samplers so that:
at a first oscillation cycle, the input signal as appearing at a first sampler of the N samplers presents a first phase value, and
at a second oscillation cycle subsequent to the first oscillation cycle, the input signal as appearing at the first sampler of the N samplers presents a second phase value different from the first phase value.