Method and apparatus for a control signal generating circuit
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United States of America Patent
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Issued Date -
Feb 24, 2005
app pub date -
Oct 30, 2003
filing date -
Oct 30, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A control signal generating circuit (460) for an automatic frequency control (AFC) circuit (465), in accordance with the present invention receives a digital timing control signal directly from the output of a digital loop filter (138) of a tracking circuit (430), and produces a frequency control signal that is provided to a VCXO (110). The control signal generating circuit (460) comprises a multiplier (462) and an integrator (466) which are relatively simple to implement, and does not require complex processing, such as determining an inverse tangent as taught by the prior. Consequently, approximation errors associated with inverse tangent processing are avoided.
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