Methods and circuits for selectable gain amplification by...

Details Methods and circuits for selectable gain amplification by... Methods and circuits for selectable gain amplification by...

2006-08-29

2006-08-29

Choe, Henry (Department: 2817)

Amplifiers

Plural signal inputs

C330S254000

Reexamination Certificate

active

07098733

ABSTRACT:
The present invention comprises methods and circuits for increasing the number of selectable gain settings of an amplifier by subtracting gains. In one embodiment, the amplifier is configured with three gain channels that are power-of-three weighted—that is, the gain channels provide gains of 1×, 3× and 9×. By combining the gain values of those gain channels in a manner that adds and/or subtracts the gain values, the amplifier can be configured with any of 13 consecutive gain settings of the same polarity.

REFERENCES:
patent: 4760346 (1988-07-01), Kultgen et al.
patent: 6545534 (2003-04-01), Mehr
patent: 6727749 (2004-04-01), Quinn
Burr-Brown Products from Texas Instruments, “INA152 Single-Supply Difference Amplifier”, Datasheet (Jan. 2001).
Linear Technology, “LT6011/LT6012 Dual/Quad 135 μA, 14nV/√Hz, Rail-to-Rail Output Precision Op Amp”, Datasheet (2003).
Linear Technology, “LTC6910-1 LTC6910-2/LTC6910-3 Digitally Controlled Programmable Gain Amplifiers in SOT-23”, Datasheet (2002).
Linear Technology, “LTC6915 Zero Drift, Precision Instrumentation Amplifier with Digitally Programmable Gain”, Datasheet (2004).
Texas Instruments, “THS7001, THS7002 70-MHz Programmable-Gain Amplifiers”, Datasheet (Oct. 1998-Revised Aug. 1999).

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