Jeffery Allen Hunt

US Patent:

7479800, Jan 20, 2009

Filed:

Sep 28, 2006

Appl. No.:

11/540831

Inventors:

Kalyana C. Vullaganti - Dallas TX, US
Jeffery Scott Hunt - Ackerman MS, US

Assignee:

Cypress Semiconductor Corporation - San Jose CA

International Classification:

H03K 17/16
H03K 19/003

US Classification:

326 30, 326 21

Abstract:

A variable impedance sense (VIS) circuit () can detect and store an input offset value inherent in a sensing loop ( and/or ). According to a detected input offset polarity, a resulting impedance matching binary code can be adjusted to compensate for error that can be introduced by the input offset. The binary code can also be adjusted to compensate for additional error that can be introduced by dropping a least significant bit (LSB) of the code to reduce noise effects caused by the switching of the LSB.