| 摘要 |
An AGC circuit maintains a fixed level for starting AGC operation for an interference wave even if the local oscillation frequency is switched in a receiver that has a plurality of local oscillation frequencies. A frequency correction circuit for correcting the conversion gain characteristic from the antenna input up to the mixer output is provided for the input of a detector within the AGC control loop. The frequency correction circuit is provided with a trap circuit that has a fixed trap frequency by using an LC resonance circuit, for example.
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