Frequency synthesizer with loop filter calibration for...

Details Frequency synthesizer with loop filter calibration for... Frequency synthesizer with loop filter calibration for...

2007-08-21

2007-08-21

Pascal, Robert (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S017000, C331S025000, C331S00100A, C327S157000

Reexamination Certificate

active

11137210

ABSTRACT:
According to one exemplary embodiment, a frequency synthesizer module includes a loop filter, where the loop filter includes a capacitor having a first terminal and a second terminal. The frequency synthesizer module further includes a loop filter calibration module coupled to the capacitor in the loop filter. The loop filter calibration module causes an initial capacitance between the first terminal and the second terminal of the capacitor to increase to a target capacitance when the loop filter is in a calibration mode. The target capacitance can causes in increase in control of a bandwidth of the loop filter and a reduction in percent error of a unity gain bandwidth of the loop filter. The loop filter further includes a switched capacitor array configured to cause the initial capacitance to increase to the target capacitance in response to a digital feedback signal provided by the loop filter calibration module.

REFERENCES:
patent: 5055802 (1991-10-01), Hietala et al.
patent: 5247265 (1993-09-01), Norimatsu
patent: 6731145 (2004-05-01), Humphreys et al.
patent: 7084709 (2006-08-01), Leong et al.
patent: 2003/0206066 (2003-11-01), Harwood
patent: 2004/0051590 (2004-03-01), Perrott et al.
Lee at al,A Fully Integrated GMSK Modulator Using BiCMOS Σ-Δ Frequency Synthesizer with Automatic Loop Gain Calibration, RFIC Symposium (2005).
Lee at al,A 0.18um SiGe BiCMOS UHF VCO with Auto Tuning for DCT AMPS and CDMA Application, RFIC Symposium (2004).

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