Frequency synthesizer
A frequency synthesizer, frequency signal technology, applied in the direction of automatic power control, electrical components, etc., can solve the problem of not preventing frequency offset, increasing frequency error, and not preventing the level change of input A/D converter and frequency offset. It can prevent the frequency offset and improve the frequency accuracy.
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[0031] Embodiments of the present invention will be described with reference to the drawings.
[0032] In the frequency synthesizer of the embodiment of the present invention, an automatic gain control circuit (AGC circuit) is provided so that the output of the AD converter becomes constant, and the input level to the AD converter is determined by the correction value for the AGC circuit, and if the correction value is used, the input level to the AD converter is determined. Within the appropriate range, the AGC circuit controls the gain on the output stage of the AD converter, and at the same time, performs locking (synchronization) processing in the PLL control, and if the value is outside the appropriate range, the PLL control is performed. Unlock is detected, so frequency shift can be prevented.
[0033] [Configuration of Embodiment: Fig. 1]
[0034] A frequency synthesizer according to an embodiment of the present invention will be described with reference to FIG. 1 . F...
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