Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Reexamination Certificate
2011-04-19
2011-04-19
Tran, Pablo N (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
C455S161200, C455S196100, C455S216000, C455S239100, C455S242200, C327S156000, C331S025000
Reexamination Certificate
active
07929929
ABSTRACT:
A frequency synthesizer includes: a frequency source generating a reference signal that includes a plurality of pulses having periodicity based on a reference frequency; a feedback loop that includes, a phase detector circuit, a loop filter, a controlled oscillator that generates an output signal at an output, and a loop divide circuit; a non-linear circuit element at an input of the phase detector circuit, which generates intermodulation distortion that causes at least one spurious signal at the output; and a controller controlling the loop divide circuit and the non-linear circuit element. The frequency synthesizer further includes a dither circuit that adjusts the timing of some of the pulses of the reference signal based on a parameter provided by the controller to the non-linear circuit element, thereby, providing a jittered reference signal to the non-linear circuit element for attenuating the at least one spurious signal at the output.
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Bozeki John J.
Charaska Joseph A.
Dubov Vadim
Gabato, Jr. Manuel P.
Gailus Paul H.
Davis Valerie M.
Motorola Solutions, Inc.
Tran Pablo N
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