H - Electricity – 04 – L
Patent
H - Electricity
04
L
340/205
H04L 7/00 (2006.01) H03L 7/091 (2006.01) H03L 7/107 (2006.01) H04L 7/033 (2006.01)
Patent
CA 2006380
ABSTRACT A timing signal recovery circuit of the invention comprises a voltage-controlled oscillator (VCO) for generating a local timing signal in a receiver, and a phase-difference detector for generating a phase difference signal in response to the phase difference between the received signal and the generated local timing signal. The phase difference signal is applied to a loop filter to generate a VCO control signal. In the present invention, a filter control circuit for generating a filter control signal in response to the VCO control signal, is provided in order to prevent the occurrence of the unstable condition of the receiver which may occur when the loop filter generates the VCO control signal. Also, the loop filter comprises a selector for selecting the transfer function of an integrator included in the loop filter in response to the filter control signal. In other words, the filter control circuit controls the selector so as to provide the integrator of the loop filter with zero signal if the absolute value of the output of the loop filter becomes greater than a predetermined value, with the result that the excessive positive or negative voltage is not continuously supplied to the integrator.
Suzuki Takanao
Yoshida Atsushi
Corporation Nec
Smart & Biggar
LandOfFree
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