Receiver with Adjustable Reference Voltages

摘要

A receiver having an analog to digital converter with adjustable reference voltages that are calibrated to account for process variations. The receiver comprises an analog to digital converter. The analog to digital converter includes a reference generator to generate a set of N reference voltages. The reference generator adjusts voltage levels of the set of N reference voltages based on one or more control signals. A plurality of comparators compare an input signal to the set of N reference voltages. A calibration circuit generates the one or more control signals for adjusting the voltage levels of the N reference voltages based on outputs of the comparators.

主权项

1. A receiver comprising:
a first analog to digital converter comprising:
a first reference generator to generate a first set of N reference voltages from a first set of M reference voltages where M is greater than N, the first reference generator adjusting voltage levels of the first set of N reference voltages based on one or more first control signals, the first reference generator comprising a plurality of switches coupled between voltage lines for the first set of M reference voltages and voltage lines for the first set of N reference voltages, the switches to selectively connect a subset of the voltage lines for the first set of M reference voltages to the voltage lines for the first set of N reference voltages based on the one or more first control signals; anda first plurality of comparators to compare a first input signal to the first set of N reference voltages; and calibration circuitry to generate the one or more first control signals for adjusting the voltage levels of the first N reference voltages based on outputs of the first plurality of comparators.