Adaptive frequency control apparatus and method thereof

Details Adaptive frequency control apparatus and method thereof Adaptive frequency control apparatus and method thereof

2004-05-27

2008-11-18

Payne, David C (Department: 2611)

Pulse or digital communications

Receivers

Automatic frequency control

C375S322000, C375S324000, C455S192100

Reexamination Certificate

active

07453962

ABSTRACT:
The adaptive frequency control apparatus includes: a frequency downstreamer for converting the frequency of the radio frequency signal to a frequency of a defined band according to a reference signal; a frequency error measurer for measuring a frequency error between a frequency of the output signal of the frequency downstreamer and a defined frequency; a loop filter for filtering the frequency error output from the frequency error measurer based on a plurality of operational parameters, the operational parameters being changeable; a differential amplifier for generating a control signal for a voltage control based on the output signal of the loop filter; and a voltage-controlled oscillator for changing the frequency of the reference signal according to the control signal of the differential amplifier.

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