Patent · US Active

Automatic current trimming method & circuits

US7482859B2 · kind B2 · utility

2Cited by

2References

16Claims

0Family size

Assignee

VIMICRO CORPORATION · CN

Inventors

Zhao-Jun Wang · San Jose, US
Qing Yu · Rochester, US
David Xiao Dong Yang · Wuxi, CN

Key dates

Filing date	Jul 9, 2007
Grant date	Jan 27, 2009
Priority date	—
Expiry date	Jul 9, 2027

Classification

Technology area (CPC G)Physics
CPC primaryG05F3/08
WIPO fieldControl
WIPO sectorInstruments

Abstract

Techniques pertaining to a circuit architecture capable of controlling a current source to a predefined precision are disclosed. According to one aspect of the present invention, an automatic trimming circuit is proposed to automatically trim a current generated from a current generator or circuit in accordance with a reference current. The automatic trimming circuit includes a comparator, an ADC and a register. The comparator that may be implemented as a subtractor finds a difference between a generated current and a reference current. The difference is then digitized to an n-bit precision. A digital representation of the difference is then kept in a register and used subsequently correct or modify the generated current to produce a precisely controlled current.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.