Down/up-conversion mixer for direct conversion radios

Details Down/up-conversion mixer for direct conversion radios Down/up-conversion mixer for direct conversion radios

2005-10-25

2005-10-25

Trinh, Sonny (Department: 2687)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S334000

Reexamination Certificate

active

06959179

ABSTRACT:
A RF down/up-conversion circuit comprising: 1) a local oscillator chopping circuit comprising: a) a frequency divider circuit for receiving a first local oscillator (LO) signal having a frequency of LO and generating a frequency-divided second local oscillator (LO) signal having a frequency of LO/N and synchronized with the first LO signal; and b) a multiplier for receiving the first and second LO signals and generating a product signal of the first and second LO signals; and 2) a differential radio frequency (RF) mixer having a first differential input port for receiving the product signal from the multiplier and a second differential input port for receiving a first differential modulated radio frequency (RF) signal and a second differential modulated radio frequency (RF) signal, wherein the differential RF mixer generates a differential output signal.

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patent: 2002/0160740 (2002-10-01), Hatcher et al.
patent: 2003/0080809 (2003-05-01), McGrath

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