A Low Noise Low Power DC Coupled Sensor Amplifier with Offset Cancellation

Author

Krishnamurthy, Hari Krishnan ; Robinson, Dirk ; Rector, Dave M. ; La Rue, George S.

Author_Institution

Washington State Univ., Pullman, WA, USA

fYear

2010

fDate

16-16 April 2010

Firstpage

1

Lastpage

4

Abstract

A 16-channel sensor amplifier was designed in the Jazz 0.18 Â¿m CMOS process. The sensor amplifier has programmable gain from 20 to 2000 and a DC offset cancellation of Â±0.3 V using bulk voltage control. A charge pump, band gap reference and a resistor string DAC were designed for bulk voltage control. Input referred noise of 0.465 Â¿V was achieved at a gain of 2000. The power required per channel was 900 Â¿W and the supply voltages were Â±V. Simulation results show the total harmonic distortion to be 0.017% and signal-to-noise-and-distortion (SINAD) ratio is 78 dB.

Keywords

amplifiers; biosensors; integrated circuit design; low-power electronics; programmable circuits; bulk voltage control; harmonic distortion; low noise low power DC coupled sensor amplifier; offset cancellation; power 900 muW; programmable gain; signal-to-noise-and-distortion; size 0.18 mum; voltage 0.465 muV; Electrodes; Filters; Integrated circuit noise; Linearity; Low-noise amplifiers; Noise cancellation; Operational amplifiers; Resistors; Sensor phenomena and characterization; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Microelectronics and Electron Devices (WMED), 2010 IEEE Workshop on

Conference_Location

Boise, ID

ISSN

1947-3842

Print_ISBN

978-1-4244-6572-9

Type

conf

DOI

10.1109/WMED.2010.5453750

Filename

5453750