Telecommunications – Receiver or analog modulated signal frequency converter – With wave collector
Reexamination Certificate
2007-11-20
2007-11-20
Nguyen, Tony T. (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
With wave collector
C455S130000, C455S227000, C455S284000
Reexamination Certificate
active
10457825
ABSTRACT:
Rejection of local oscillator harmonic response is provided in a mixing circuit with a pair of harmonic gating switches serially connected to the outputs of a balanced differential switching mixer and controlled by a gate clock signal having twice the frequency of a local oscillator signal controlling the switching mixer. An aperture or duty cycle of the gate clock signal determines which harmonic is rejected or suppressed, which is preferably a third and/or fifth harmonic since response of the balanced differential switching mixer to even harmonics is negligible. The resulting simple, efficient circuit is readily integrated directly into a phase-alternating mixer structure for a chopper-direct-conversion radio.
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patent: 2004/0142674 (2004-07-01), Kuiri
Braatz James
Ju Shu-Ing
Schwartz Michael
Wong Hee
National Semiconductor Corporation
Nguyen Tony T.
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