Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Reexamination Certificate
2007-01-30
2007-01-30
Vuong, Quochien B. (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
C455S259000, C455S258000, C455S076000, C331S017000, C331S111000, C331S147000
Reexamination Certificate
active
10407097
ABSTRACT:
A linear fractional-N synthesizer includes phase and frequency detection module, a charge pump circuit, a loop filter, a voltage controlled oscillator, and a fractional-N divider. The phase and frequency detection module is operably coupled to produce a charge up signal, a charge down signal, or an off signal based on a phase difference and/or a frequency difference between a reference oscillation and a feedback oscillation. The charge pump circuit is operably coupled to produce a positive current when the charge up signal is received, a negative current when the charge down signal is received, and a non-zero offset current when the off signal is received. The charge pump includes a resistor and a control module. The resistor provides the non-zero offset current and the control module maintains the non-zero offset current at a substantially constant value. The loop filter is operably coupled to produce a control voltage based on at least some of: the positive current, the negative current, and the non-zero offset current. The voltage controlled oscillator produces an output oscillation based on the control voltage. The fractional-N divider module operably coupled to divided the output oscillation by a fractional N value to produce the feedback oscillation.
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Broadcom Corporation
Chan Richard
Garlick & Harrison & Markison
Vuong Quochien B.
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