Modulation method and apparatus

Details Modulation method and apparatus Modulation method and apparatus

2011-03-08

2011-03-08

Tran, Pablo N (Department: 2618)

Telecommunications

Transmitter

Frequency conversion

C455S102000, C455S196100, C455S209000, C455S258000, C455S316000, C330S010000

Reexamination Certificate

active

07904036

ABSTRACT:
A modulation circuit for use in a radiofrequency transmitter includes a local oscillator circuit configured to generate one or more local oscillator signals at a desired frequency and with a duty cycle at or about twenty-five percent, and a modulator configured to generate one or more modulated signals responsive to the one or more local oscillator signals and one or more baseband information signals. In at least one embodiment, the modulation circuit includes a modulator comprising a combined mixing and transconductance circuit that includes a transistor circuit for each baseband information signal serving as a modulation input to the modulator. Each transistor circuit comprises a first transistor driven by the baseband information signal and coupling a modulator output node to a corresponding transconductance element, and a second transistor driven by one of the one or more local oscillator signals and coupling the corresponding transconductance element to a signal ground node.

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