Amplifiers – Hum or noise or distortion bucking introduced into signal...
Reexamination Certificate
2008-01-28
2010-02-02
Pascal, Robert (Department: 2817)
Amplifiers
Hum or noise or distortion bucking introduced into signal...
C375S296000
Reexamination Certificate
active
07656229
ABSTRACT:
An electronic device includes an amplifier circuit coupled to a linearizer. The amplifier circuit may receive a first input signal including first and second frequencies and generate a first output signal including a delta frequency signal at a delta frequency, which is the difference between the first frequency and the second frequency. The linearizer includes a signal detector circuit, a current-mirror circuit, a low pass filter, a phase shifter, and a bias circuit. The signal detector circuit may generate a second output signal. The current-mirror circuit may adjust an amplitude of a signal. The low pass filter may eliminate a portion of the second output signal having frequencies greater than the delta frequency. The phase shifter may generate a feedback signal corresponding to the delta frequency signal. An amplitude and/or a phase of the feedback signal is different from an amplitude and/or a phase of the delta frequency signal.
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Deng Junxiong
Gudem Prasad S.
Liu Li
Hooks William M.
Moskowitz Larry
Nguyen Hieu P
Pascal Robert
QUALCOMM Incorporated
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