Current-mode instrumentation amplifier

Details Current-mode instrumentation amplifier Current-mode instrumentation amplifier

2007-01-23

2007-01-23

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S253000

Reexamination Certificate

active

11154135

ABSTRACT:
A current-mode instrumentation amplifier (IA) includes first and second buffer amplifiers which receive a differential voltage (VINP−VINN) and provide output voltages at respective output nodes; a resistance R1is connected between the nodes and conducts a current IR1that varies with VINP−VINN. In one embodiment, each amplifier includes a transistor connected in series with R1which conducts current IR1; these currents are coupled to the input and output terminals of a current mirror, preferably via respective virtual ground nodes such that the IA requires only one current mirror, to produce the IA's output voltage. To minimize DC mismatch errors, the IA is chopper-stabilized, with the buffer amplifiers and signal current paths chopped using a two-phase chopping cycle.

REFERENCES:
patent: 4881045 (1989-11-01), Dillman
patent: 6538503 (2003-03-01), Burt
patent: 6639460 (2003-10-01), Botker
patent: 6653894 (2003-11-01), Botker
patent: 6753730 (2004-06-01), Yamamoto
patent: 6919766 (2005-07-01), Suzuki
patent: 2002/0190734 (2002-12-01), Burt et al.
Burr-Brown Products, “Precision, Rail-to-Rail I/O Instrumentation Amplifier”, Nov. 2004, pp. 1-21.

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