Patent ID: 8847811

Claim:
An analog-to-digital conversion (ADC) circuit to convert an analog input signal to a digital output signal, comprising: a plurality of conversion stages coupled in series, each of the plurality of conversion stages configured to generate a bit for the digital output signal; and a data latch configured to receive bits for the digital output signal from the plurality of conversion stages and to provide the digital output signal based on the bits; wherein a conversion stage of the plurality of conversion stages includes: a comparator circuit configured to compare a sampled input signal with a reference signal and to generate an associated bit for the digital output signal based on a result of the comparison; and a multiplexer circuit configured to provide an associated reference signal to a comparator circuit of a next conversion stage, the next conversion stage being subsequent to the conversion stage, and wherein the ADC circuit comprises an asynchronous serial-ripple ADC configured to receive an external clock signal to trigger a comparator of a first conversion stage of the plurality of conversion stages and to generate a plurality of clock pulses to trigger comparator circuits of other conversion stages of the plurality of conversion stages.