Method and apparatus for controlling a bias current of a VCO...

Details Method and apparatus for controlling a bias current of a VCO... Method and apparatus for controlling a bias current of a VCO...

2007-10-25

2011-12-06

Jackson, Blane J (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S257000, C331S018000

Reexamination Certificate

active

08073416

ABSTRACT:
A local oscillator includes a phase-locked loop. The phase-locked loop includes voltage controlled oscillator (VCO) and a novel VCO control circuit. The VCO control circuit may be programmable and configurable. In one example, an instruction is received onto the VCO control circuit to change the power state of the VCO. The instruction is issued by other circuitry in response to a detected change in RF channel conditions (for example, a change in a signal-to-noise determination) in a cellular telephone. In response, the VCO control circuit outputs control signals that gradually widen the loop bandwidth of the PLL, then gradually change the VCO bias current to change the VCO power state, and then narrow the loop bandwidth of the PLL back to its original bandwidth. The entire process of widening the PLL bandwidth, changing the VCO power state, and narrowing the PLL bandwidth occurs while the PLL remains locked.

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International Search Report and Written Opinion—PCT/US2008/081033, International Search Authority— European Patent Office—Jun. 8, 2009.

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