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New CMOS current source which shows better CMOS process variation rejection

IP.com Disclosure Number: IPCOM000124397D
Original Publication Date: 2005-May-20
Included in the Prior Art Database: 2005-May-20
Document File: 2 page(s) / 234K

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 CMOS process 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.

The current source circuit shown in Fig. 1 has characteristic waveforms by variation of CMOS process condition for the current source. Fig. 2 shows a current source circuit which has different waveform dependencies on variation of CMOS process condition. It is proposed to combine these two circuits into one circuit (Fig. 3) to obtain a current source circuit which has a reduced dependency on variation of CMOS process conditions.

Fig. 1: Current Source 1 with dependency on variation of CMOS process conditions

Fig. 2: Current Source 2 with dependency on variation of CMOS process conditions

© SIEMENS AG 2005 file: ifx_2004J54965.doc page: 1

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Fig. 3: Combined Source with reduced dependency on variation of CMOS process conditions

© SIEMENS AG 2005 file: ifx_2004J54965.doc page: 2

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