Isolated high voltage sampling network

摘要

Methods and systems for sampling a differential signal. The sampling circuit includes a differential input and a differential output. A logic control block, which is powered by VDD and VSS sources, controls the state of switches used to sample and store differential signals. The logic control block is AC coupled to the switches. The sampling circuit is configured to sample a common mode voltage at the differential input of a level that exceeds that of the VDD and VSS sources.

主权项

1. A differential sampling circuit, comprising:
VDD and VSS voltage sources; a differential input having a common mode voltage when a differential input signal is applied thereto; a differential output for providing a sample of the differential input signal; sampling circuitry coupled to the differential input and including a plurality of switches controlled to sample the differential input signal and store a replica of the common mode voltage at a common mode node, wherein the common mode voltage exceeds the voltages of the VDD and VSS sources; and a logic control block powered by VDD and VSS sources and configured to control the switches.