Dual band frequency synthesizer

Details Dual band frequency synthesizer Dual band frequency synthesizer

2006-04-24

2009-06-09

Le, Nhan T (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S316000, C455S323000, C331S060000

Reexamination Certificate

active

07546102

ABSTRACT:
The invention relates to a dual band frequency synthesizer for generating either a first output frequency fhighor a second output frequency flow, where fhigh=2 flow, comprising an oscillator circuit for generating at its output a frequency fVCO=(fhigh+flow)/2, a divide by three (3) circuit, coupled to the output of the oscillator circuit, for generating at its output an offset frequency fDB3=fVCO/3, and a double quadrature mixer circuit, coupled to the output of the oscillator circuit and to the output of the divide by three circuit, for generating either the first output frequency fhigh=fVCO+fDB3or the second output the frequency flow=fVCO−fDB3.

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Razavai, B., “A 900-MHz/1.8-GHz CMOS Transmitter for Dual-Band Applications”, IEEE Journal of Solid-State Circuits, vol. 34, No. 5, May 1999.

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