Linearized fractional-N synthesizer having a gated offset

Details Linearized fractional-N synthesizer having a gated offset Linearized fractional-N synthesizer having a gated offset

2007-10-30

2007-10-30

Urban, Edward F. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S316000, C375S376000

Reexamination Certificate

active

11222632

ABSTRACT:
A linearized oscillation synthesizer includes a phase and frequency detection module, charge pump circuit, low pass filter, voltage control oscillator, and a feedback module. The phase and frequency detection module is operably coupled to produce a charge-up signal, a charge-down signal, and an off signal based on phase and/or frequency differences between a reference oscillation and a feedback oscillation. The reference oscillation is generated by a clock source such as a crystal oscillator while the divider module generates the feedback oscillation by dividing the output oscillation by a divider value. The charge pump circuit produces a positive current in response to the charge-up signal, a negative current in response to the charge-down signal and also produces a non-zero offset current. The non-zero offset current shifts the steady state operating condition, and other operating conditions, of the charge pump into a linear region of charge pump performance curve.

REFERENCES:
patent: 5783972 (1998-07-01), Nishikawa
patent: 6574288 (2003-06-01), Welland et al.
patent: 6622010 (2003-09-01), Ichimaru
patent: 6639475 (2003-10-01), Ichimaru
patent: 6952569 (2005-10-01), Damgaard et al.
patent: 6985708 (2006-01-01), Lin et al.
patent: 7171183 (2007-01-01), Chien
patent: 2002/0049047 (2002-04-01), Elder et al.
patent: 2002/0097825 (2002-07-01), Kawahara

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