Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Reexamination Certificate
2005-08-09
2005-08-09
Nguyen, Khanh V. (Department: 2817)
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
C330S150000, C330S310000, C330S279000
Reexamination Certificate
active
06927628
ABSTRACT:
A gain-control method and device that enable high-speed gain switching of cascaded programmable gain amplifiers (PGA) without a high-resolution A/D converter is provided. In one example, the gain-control method for cascaded PGAs detects all the input levels of the PGAs, calculates the optimum gains of the PGAs each on the basis of the detection results, and sets the obtained optimum gains of each of the PGAs at one time, whereby high-speed gain switching becomes possible. The gain-control device for cascaded PGAs that implements this gain-control method includes peak hold circuits that retain the input levels of each of the PGAs, a switch group that sequentially switches outputs of the peak hold circuits, an A/D converter that sequentially detects the outputs from the switch group, and a control and operation device that calculates the optimum gains of the PGAs from the detection results by the A/D converter to set the calculated optimum gains simultaneously to each of the PGAs.
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Maio Kenji
Oshima Takashi
A. Marquez, Esq. Juan Carlos
Fisher Esq. Stanley P.
Nguyen Khanh V.
Reed Smith LLP
Renesas Technology Corporation
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