On-chip loop filter for use in a phase locked loop and other...

Details On-chip loop filter for use in a phase locked loop and other... On-chip loop filter for use in a phase locked loop and other...

2006-07-25

2006-07-25

Maung, Nay (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S259000, C455S258000, C455S257000, C455S183100, C331S011000, C331S017000, C331S016000

Reexamination Certificate

active

07082295

ABSTRACT:
A phase locked loop that includes such a loop filter, the phase locked loop includes a difference detector, programmable charge pump, fixed loop filter, voltage controlled oscillator and adjustable divider module. The difference detector is operably coupled to determine a different signal based on differences in phase and/or frequency between a reference oscillation and a feedback oscillation. The programmable charge pump is operably coupled to generate a charge current based on the difference signal and a scaling signal. The fixed loop filter is operably coupled to convert the charge current into a control voltage. The voltage controlled oscillator generates an output oscillation based on the control voltage and the adjustable divider module generates the feedback oscillation based on the output oscillation and a divider value. The scaling module is operably coupled to produce the scaling signal based on the selected divider.

REFERENCES:
patent: 6078634 (2000-06-01), Bosshart
patent: 6356160 (2002-03-01), Robinson et al.
patent: 6407643 (2002-06-01), Canard et al.
patent: 6456831 (2002-09-01), Tada
patent: 6563387 (2003-05-01), Hirano et al.
patent: 6674331 (2004-01-01), McDowell
patent: 6900700 (2005-05-01), Oosawa et al.
patent: 6906596 (2005-06-01), Kitamura et al.

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