Amplifiers – Sum and difference amplifiers
Reexamination Certificate
2005-06-14
2005-06-14
Mottola, Steven J. (Department: 2817)
Amplifiers
Sum and difference amplifiers
C330S144000, C330S254000
Reexamination Certificate
active
06906584
ABSTRACT:
The present invention provides a switchable gain amplifier comprising a high-pass filter pole. The switchable gain amplifier comprises first and second input nodes for receiving first and second components of a differential input signal. A first input terminal of a first differential amplifier is coupled to the first input node, and a first input terminal of a second differential amplifier is coupled to the second input node. A first variable resistance is coupled between the first input terminal of the first differential amplifier and a second input terminal of the first differential amplifier. A second variable resistance is coupled between the first input terminal of the second differential amplifier and a second input terminal of the second differential amplifier. A differential capacitor is coupled between the second input terminal of the first differential amplifier and the second input terminal of the second differential amplifier.
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Granger-Jones Marcus
Moffat Mark
Mottola Steven J.
RF Micro Devices, Inc.
Withrow & Terranova , PLLC
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