| 摘要 |
An automatic frequency control apparatus includes a mixer, a phase error detector, an absolute value converter, a determination unit, a multiplier and an oscillator. The mixer performs a frequency alternation of a phase modulated signal received thereto based on a frequency of a carrier signal. The phase error detector generates a carrier phase error. The absolute value converter calculates an absolute value of the phase error. The determination compares the absolute value with predetermined threshold values and generates loop gain based on the comparison. The multiplier generates a correction value based on the phase error and the loop gain. The oscillator generates the carrier signal based on the correction value.
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