R/2R programmable gate array

Details R/2R programmable gate array R/2R programmable gate array

2011-01-25

2011-01-25

Nguyen, Patricia (Department: 2817)

Amplifiers

Signal feedback

Variable impedance in feedback path varied by separate...

C330S278000, C330S260000

Reexamination Certificate

active

07876151

ABSTRACT:
Systems and methods to achieve an IC audio volume control requiring minimum silicon area and having an accurate volume control gain setting are disclosed. A resistive element in form of a R/2R ladder is deployed between an output node of an operational amplifier and an input node of the circuit. All resistors of said resistive element are unit resistors having a same resistance, wherein said unit resistors are arranged in parallel or series combinations to achieve a resistance desired. A first number of switches are deployed between nodes of the R/2R ladder and an inverting input of the operational amplifier. Furthermore a second number of switches are deployed between nodes within resistor units of the R/2R ladder and the inverting input. The circuit invented could have a single input or a differential input, or a single ended output or a differential output.

REFERENCES:
patent: 6032109 (2000-02-01), Ritmiller, III
patent: 6127893 (2000-10-01), Llewellyn et al.
patent: 6147558 (2000-11-01), Sculley
patent: 6239655 (2001-05-01), Orozov et al.
patent: 6405164 (2002-06-01), Pinai
patent: 6448856 (2002-09-01), Noro et al.
patent: 6518910 (2003-02-01), Sakuragi et al.
patent: 6545620 (2003-04-01), Groeneweg
patent: 6693491 (2004-02-01), Delano
patent: 6807406 (2004-10-01), Razavi et al.
patent: 6885236 (2005-04-01), Vorenkamp
patent: 7162029 (2007-01-01), Soman et al.
patent: 7298855 (2007-11-01), Tsuji et al.
patent: 7339434 (2008-03-01), Shirvani-Mahdavi et al.
patent: 7466746 (2008-12-01), Gupta
patent: 2008/0212802 (2008-09-01), Shih et al.

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