Dual-channel instrumentation amplifier

Details Dual-channel instrumentation amplifier Dual-channel instrumentation amplifier

2006-10-10

2006-10-10

Nguyen, Khanh Van (Department: 2817)

Amplifiers

With periodic switching input-output

C330S253000

Reexamination Certificate

active

07119612

ABSTRACT:
A dual-channel instrumentation amplifier includes two channels of PMOS transistor differential pairs which are configured in a Y-connection and cross-coupled to two diode-connected NMOS transistors. Each input channel has a non-linear voltage-current characteristic. But when the differential currents cancel at the NMOS transistor diodes, both input channels have the same differential input voltage, regardless of any non-linearity. As thus configured, a high accuracy instrumentation amplifier which operates in current mode is realized with excellent DC matching and high common mode rejection ratio. In one embodiment, the dual-channel instrumentation amplifier is used as input stage for the linear comparator to enable the linear comparator to operate at a high rate of speed with excellent channel matching.

REFERENCES:
patent: 6011436 (2000-01-01), Koike
patent: 6359510 (2002-03-01), Ishii et al.
patent: 6639431 (2003-10-01), Potter
patent: 6798293 (2004-09-01), Casper et al.

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