Charge pump for an integrated circuit receiver

Details Charge pump for an integrated circuit receiver Charge pump for an integrated circuit receiver

2005-12-13

2005-12-13

Nguyen, Lee (Department: 2682)

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

C455S086000, C455S259000, C327S157000, C331S017000

Reexamination Certificate

active

06975840

ABSTRACT:
A radio transceiver includes a charge pump formed within a local oscillator that adjusts a voltage input to a voltage-controlled oscillator in a manner that flattens a response curve for small changes in voltage due to a variety of effects including channel length modulation. Thus, a local oscillation tends to provide a greater degree of stability. More specifically, the charge pump of the transceiver includes a pair of feedback circuits that source an additional amount of current into a filter to slightly increase a voltage input to the voltage-controlled oscillator in response to small upward changes in output voltage levels (input with respect to the voltage-controlled oscillator). Similarly, when the output voltage level drops slightly, a second feedback circuit causes a small amount of current to be sinked from the output node thereby slightly decreasing the input voltage to the voltage-controlled oscillator. Thus, the inventive charge pump produces better matching between IUPand IDOWNthus operating to produce a response curve that tends to be flatter in response to small voltage changes due to circuit conditions.

REFERENCES:
patent: 6421530 (2002-07-01), Adachi et al.
patent: 6531913 (2003-03-01), Ross

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