Indirect Current Feedback Instrumentation Amplifier with a Common Mode Input Range That Includes the Negative Rail

Author

Van Den Dool, Bernard J. ; Huijsing, Johan H.

Author_Institution

Dept. of Electr. Eng., Delft Univ. of Technol., Delft, Netherlands

fYear

1992

fDate

21-23 Sept. 1992

Firstpage

175

Lastpage

178

Abstract

An instrumentation amplifier is presented which can handle common-mode voltages that extend 200 mV below the negative supply. The extended range is combined with a good common-mode rejection (91 dB) and good accuracy (0.1%) without the need for on-chip trimming. This has been achieved by the use of a simple PNP input stage with indirect current feedback. The output voltage can reach the negative supply. The offset voltage is 0.3 mV, the noise voltage is 30 nV/√Hz. The circuit can work at a supply voltages down to 2.5 V and the quiescent current is 240 μA. The instrumentation amplifier has been integrated in a semi-custom bipolar process.

Keywords

instrumentation amplifiers; common mode input range; common-mode rejection; common-mode voltage; indirect current feedback instrumentation amplifier; negative rail; on-chip trimming; Bridge circuits; Impedance; Instruments; Negative feedback; Rail to rail amplifiers; Resistors; Telephony; Transconductance; Transfer functions; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Circuits Conference, 1992. ESSCIRC '92. Eighteenth European

Conference_Location

Copenhagen

Print_ISBN

87-984232-0-7

Type

conf

DOI

10.1109/ESSCIRC.1992.5468266

Filename

5468266