Local oscillator architecture to reduce transmitter pulling...

Details Local oscillator architecture to reduce transmitter pulling... Local oscillator architecture to reduce transmitter pulling...

2005-02-01

2005-02-01

Trinh, Sonny (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S259000, C455S260000, C455S317000

Reexamination Certificate

active

06850749

ABSTRACT:
A local oscillator architecture provides a signal at an output frequency with reduced pulling effect. A voltage controlled oscillator (VCO) generates a first signal having a frequency that is a fraction of the output frequency. A frequency shifter generates a second signal with a frequency substantially equal to the difference between the VCO frequency and the output frequency. Single-sideband mixers are used to produce output signals at the sum of the VCO frequency and the shifted frequency while suppressing an unwanted sideband at the difference of the two frequencies.

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