Gain adjustment for programmable gain amplifiers

Details Gain adjustment for programmable gain amplifiers Gain adjustment for programmable gain amplifiers

2007-05-24

2009-06-09

Nguyen, Khanh V (Department: 2817)

Amplifiers

Signal feedback

Variable impedance in feedback path varied by separate...

C330S254000, C330S282000

Reexamination Certificate

active

07545210

ABSTRACT:
A programmable gain amplifier (PGA) circuit includes a gain adjust circuit and a gain select circuit that are both coupled to an output of an amplifier. The gain select circuit completes feedback to the amplifier while the gain adjust circuit is arranged to boost or cut the gain of the gain selection circuit. The gain adjust circuit can be arranged as a trim adjustment to the overall gain of the PGA circuit, where a different trim adjustment can be mapped to each gain setting such as from a look-up table. In other example implementations, the PGA circuit can periodically switch between multiple gain settings using a modulation scheme such that the overall gain is blended between the various gain settings according to a duty cycle, pulse-width, or delta-sigma modulation, with a time averaging effect on the overall gain of the PGA circuit.

REFERENCES:
patent: 3795825 (1974-03-01), McGhee
patent: 4396890 (1983-08-01), Kato et al.
patent: 5189421 (1993-02-01), Daugherty
patent: 5233309 (1993-08-01), Spitalny et al.
patent: 5387879 (1995-02-01), Satoh
patent: 5481225 (1996-01-01), Lumsden et al.
patent: 5512859 (1996-04-01), Moraveji
patent: 5955925 (1999-09-01), Segawa et al.
patent: 6020785 (2000-02-01), Allen et al.
patent: 6031421 (2000-02-01), McEwan
patent: 6198349 (2001-03-01), Kanno et al.
patent: 6294958 (2001-09-01), Eschauzier
patent: 6396934 (2002-05-01), Federspiel
patent: 7102440 (2006-09-01), Damitio et al.
patent: 7352242 (2008-04-01), Hughes
patent: 2005/0024129 (2005-02-01), Jang
patent: 2005/0225393 (2005-10-01), Lee et al.
patent: 2005/0285674 (2005-12-01), Zaguri
patent: 2006/0093153 (2006-05-01), Yamamoto et al.
patent: 2006/0181343 (2006-08-01), Moon et al.
patent: 196 30 393 (1998-01-01), None
patent: 0 091 160 (1983-10-01), None
patent: 0 495 302 (1992-07-01), None
patent: 0 571 075 (1993-11-01), None
patent: 0 571 075 (1993-11-01), None
patent: 1 0001 527 (2000-05-01), None
patent: 57 125507 (1982-08-01), None
patent: 58 124310 (1983-07-01), None
patent: 63 132510 (1988-06-01), None
patent: WO 99/63661 (1999-12-01), None
Wooley, “Cascaded Noise-Shaping Modulators for Oversampled Data Conversion,” Custom Integrated Circuits Conference, Proceedings of IEEE 2003, Sep. 21-24, 2003, pp. 113-114.
Cheung et al., “An FPGA-based re-configurable 24-bit 96kHz sigma-delta audio DAC,” Field-Programmable Technology, 2003 Proceedings.2003 IEEEInternational Conference on Dec. 15-17, 2003, pp. 110-117.
Tim Wescott, “Sigma-delta techniques extend DAC resolution” Jun. 23, 2004,CMP Media LLC 2005, http://www.embedded.com/showArticle.jhtml?articleID=22101730 (5 pgs).

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