Capacitive isolation circuitry

Abstract

An integrated circuit having voltage isolation capabilities includes a plurality of communications channels for transceiving data from the integrated circuit. Each of the communications channel includes capacitive isolation circuitry located in conductive layers of the integrated circuit for providing a high voltage isolation link. The capacitive isolation circuitry distributes a first portion of a high voltage isolation signal across a first group of capacitors on a first link and a second link in the capacitive isolation circuitry and distributes a second portion of the high voltage isolation signal across a second group of capacitors in the first link and the second link in the capacitive isolation circuitry. A differential receiver on each of the plurality of communications channels receives the data on the first link and the second link. A differential transmitter on each of the plurality of communications channels transmits the data on the first link at a selected one of a first phase and a second phase and for transmitting the data on the second link at the selected one of the first phase and the second phase. The second phase is 180 degrees out of phase with the first phase. Each of the differential transmitters controls the selection of the first phase and the second phase on each of the first link and the second link such that only the first phase or the second phase is cross coupled onto a selected communications channel from adjacent communications channels.

Description

[0001] Cross References to Related Applications [0002] This application is made in accordance with U.S. Patent Application No. 11 / 772,178 (Attorney Docket No. CYGL-28,319), entitled "BIDIRECTIONAL MULTIPLEXED RF ISOLATOR," filed June 30, 2007 (which application was filed on March 24, 2005 Pending U.S. Application Serial No. 11 / 089,348 (Attorney Docket No. CYGL-27,047) entitled "SPREAD SPECTRUMISOLATOR" (which in turn was filed on September 2, 2008 and entitled "TRANSFORMER ISOLATOR FOR DIGITAL POWER SUPPLY" U.S. Patent No. 7,421,028 (Attorney Docket No. CYGL-26,747); U.S. Patent No. 7,447,492 entitled "ON-CHIP TRANSFORMER ISOLATOR" issued on November 4, 2008 (Attorney Docket No. CYGL-26,768); U.S. Patent No. 7,376,212, issued May 20, 2008, entitled "RF ISOLATOR WITH DIFFERENTIALINPUT / OUTPUT" (Attorney Docket No. CYGL-26,965); issued December 2, 2008, entitled Continuation-in-part) of US Patent No. 7,460,604 (Attorney Docket No. CYGL-27,015) for "RF ISOLATORFOR ISOLATING VOLTA...

AI Technical Summary

Problems solved by technology

This will result in the presence of large common-mode signals in the isolator at RF frequencies

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