Title :
Indirect current feedback instrumentation amplifier with a common-mode input range that includes the negative roll
Author :
Van Den Dool, Bernard J. ; Huijsing, Johan H.
Author_Institution :
Dept. of Electr. Eng., Delft Univ. of Technol., Netherlands
fDate :
7/1/1993 12:00:00 AM
Abstract :
An instrumentation amplifier which can handle common-mode voltages that extend 200 mV below the negative supply is presented. The extended range is combined with a common-mode rejection of 92 dB and an accuracy of 0.1%, without the need for on-chip trimming. This has been achieved by the use of two p-n-p V-to-f converters in an indirect current feedback configuration. The output voltage can reach the negative supply. The offset voltage is 0.3 mV, and the noise voltage is 30 nV/√Hz. The circuit operates at supply voltages down to 2.5 V, and the quiescent current is 240 μA. The instrumentation amplifier has been integrated in a semicustom bipolar process
Keywords :
application specific integrated circuits; bipolar integrated circuits; feedback; instrumentation amplifiers; linear integrated circuits; 2.5 V; 240 muA; common-mode input range; differential amplifiers; indirect current feedback; instrumentation amplifier; monolithic IC; negative roll; p-n-p V/I convertors; quiescent current; semicustom bipolar process; Circuits; Electric variables measurement; Feedback; Instruments; Interference; Operational amplifiers; Rail to rail amplifiers; Resistors; Sensor systems; Voltage;
Journal_Title :
Solid-State Circuits, IEEE Journal of
