A chopper-based CMOS current sense instrumentation amplifier [for GSM]

Author

Christoforou, Y.

Author_Institution

Philips Semicond., Nijmegen, Netherlands

Volume

1

fYear

2002

fDate

6/24/1905 12:00:00 AM

Firstpage

271

Abstract

We present in this paper a very low power, bipolar current sense chopper amplifier circuit, destinated to be used inside power management circuits for GSM applications. The role of the amplifier is to measure the current charging or discharging the battery of the cellular handset. This should allow an optimal use of the battery. For the reduction of the offset, the amplifier uses the chopper technique. The amplifier uses a resistor ratio to improve gain precision, needs a very small area 400 μm × 150 μm, consumes only 10 μA and exhibits a minimum residual offset of 15 μV for 16 kHz of chopper frequency.

Keywords

CMOS analogue integrated circuits; cellular radio; choppers (circuits); feedback amplifiers; instrumentation amplifiers; low-power electronics; operational amplifiers; CMOS current sense; GSM applications; OTA; cellular handset; chopped offset; chopper-based amplifier circuit; current charging; current discharging; feedback; instrumentation amplifier; power management circuits; Battery charge measurement; Choppers; Circuits; Current measurement; Energy management; Frequency; GSM; Instruments; Resistors; Telephone sets;

fLanguage

English

Publisher

ieee

Conference_Titel

Instrumentation and Measurement Technology Conference, 2002. IMTC/2002. Proceedings of the 19th IEEE

ISSN

1091-5281

Print_ISBN

0-7803-7218-2

Type

conf

DOI

10.1109/IMTC.2002.1006852

Filename

1006852