Wide common-mode range receiver

摘要

A wide common-mode range receiver includes an input module, voltage level shift module, voltage level shift control module, and output module. The receiver can also include an equalizer. The receiver translates data originating from a circuit powered from an external voltage supply to a circuit powered by an internal voltage supply. The voltage level shift may be scaled based on differences between the voltage supplies or by determining the difference between an input common-mode voltage and a reference voltage, and driving a servo based on the difference.

主权项

1. A common-mode receiver comprising:
an input circuit configured to receive a first input signal and a second input signal, wherein the first and second input signals are associated with a first common-mode voltage; a voltage level shift circuit operatively coupled to the input circuit and comprising:
a first current source operatively coupled to a first output of the input circuit, wherein the first current source is controlled by a control signal, anda second current source operatively coupled to a second output of the input circuit, wherein the second current source is controlled by the control signal; and a control circuit operatively coupled to the voltage level shift circuit, and configured to receive the first common-mode voltage and generate the control signal based at least in part on a magnitude of a current induced by a difference between the first common-mode voltage and a reference common-mode level, wherein the voltage level shift circuit is configured to:
shift a voltage level of the first input signal and the second input signal based at least in part on the control signal, wherein the voltage level is shifted in proportion to the magnitude of the current induced by the difference between the first common-mode voltage and the reference common-mode level, andoutput a first output signal based at least in part on the shifted voltage level of the first input signal and a second output signal based at least in part on the shifted voltage level of the second input signal, wherein the first and second output signals are associated with an output common-mode level.