Phase-locked loop filter with out of band rejection in low...

Details Phase-locked loop filter with out of band rejection in low... Phase-locked loop filter with out of band rejection in low...

2005-11-22

2005-11-22

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S554000

Reexamination Certificate

active

06967513

ABSTRACT:
A wideband impedance attenuator includes a phase-locked loop filter, a voltage-controlled oscillator connected to the phase-locked loop filter during transmit, and an impedance circuit connected to the phase-locked loop filter and the voltage controlled oscillator. The impedance circuit is a scaled version of the phase-locked loop filter. Moreover, the wideband impedance attenuator attenuates a Gaussian frequency shift key modulation signal by a factor of 1/(N+1) using the impedance circuit, which has an impedance of N*Z(s), and the phase-locked loop filter, which has an impedance of Z(s). An output frequency is generated using a voltage-controlled oscillator wherein the output frequency corresponds to the attenuated Gaussian frequency shift key modulation signal. In addition, a comparator compares a voltage of an output from the programmable gain amplifier with a voltage necessary to produce a predetermined frequency shift in a voltage-controlled oscillator to produce a gain signal. A gain controller, in response to the gain signal produced by the comparator, controls a gain of the programmable gain amplifier.

REFERENCES:
patent: 5170130 (1992-12-01), Ichihara
patent: 5384502 (1995-01-01), Volk
patent: 5559474 (1996-09-01), Matsumoto et al.
patent: 5648744 (1997-07-01), Prakash et al.
patent: 6137372 (2000-10-01), Welland
patent: 6369626 (2002-04-01), Donnelly et al.
patent: 6373304 (2002-04-01), Drost et al.
patent: 6433596 (2002-08-01), Bossard
patent: 6690240 (2004-02-01), Maxim et al.
“A Fully Integrated CMOS DCS-1800 Frequency Synthesizer”; Craninckx et al.; IEE Journal of Solid-State Circuits, vol. 33, No. 12, Dec. 1998; pp.: 2054-2065.

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