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New CMOS current source which shows better resistor variation rejection

IP.com Disclosure Number: IPCOM000035603D
Published in the IP.com Journal: Volume 5 Issue 2 (2005-02-25)
Included in the Prior Art Database: 2005-Feb-25
Document File: 1 page(s) / 91K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

A current source in CMOS technology provides a constant current ideally independent of other parameters, like CMOS process variation, temperature, power supply voltage or resistor variation. Today current sources suffer from being dependent on these parameters.

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New CMOS current source which shows better resistor variation rejection

Idea: Ph.D. Xiaowu Gong, SG-Singapore

A current source in CMOS technology provides a constant current ideally independent of other parameters, like CMOS process variation, temperature, power supply voltage or resistor variation. Today current sources suffer from being dependent on these parameters.

It is proposed to introduce a circuit as shown as in Fig. 1 to reduce CMOS current source variation from resistor variation. The circuit contains a transistor and a resistor and an added operational amplifier in order to have improved power supply voltage rejection.

Fig. 1: Proposed circuit with better resistor variation rejection

© SIEMENS AG 2005 file: ifx_2004J54963.doc page: 1

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