| 摘要 |
A delay detection is performed to baseband signals subjected to an orthogonal demodulation to obtain a delay detection output and a frequency error is found from the delay detection output. The frequency error is converted into a control frequency which is accumulated to generate a phase rotation phi which is used to rotate the input baseband signals before being subjected to the delay detection, thereby to perform frequency correction. By providing filters downstream of a phase rotation circuit and upstream of a delay detection circuit, automatic frequency control can be realized without performance deterioration.
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