JP2003142967A5 - - Google Patents

Claims (5)

In a receiving apparatus that receives a signal having a plurality of frequency-divided channels,
A variable gain circuit including a variable gain loop for maintaining a variable received signal level at a certain level;
A plurality of stages of band-pass filters for extracting only signals of a target frequency from a plurality of adjacent channels based on the output of the variable gain circuit;
A receiving apparatus, wherein a part of the plurality of stages of band-pass filters is incorporated in a variable gain loop of the variable gain circuit. Further, a limiter circuit connected to the subsequent stage of the variable gain circuit for limiting the level of the received signal;
The reception level detection circuit according to claim 1, further comprising: a reception level detection circuit that detects a reception signal level based on a level of a gain control signal of the gain variable circuit and a signal level detection signal of the limiter circuit. Receiver device.   2. The receiving device according to claim 1, wherein among the plurality of stages of band-pass filters, the number of stages to be taken into the variable gain loop and the number of stages connected to the output side of the variable gain circuit are made variable. .   4. The receiving apparatus according to claim 1, further comprising a bypass circuit for bypassing a band-pass filter in the variable gain loop according to a control signal. A first frequency conversion circuit for converting the received signal into a first intermediate frequency signal;
4. A second frequency conversion circuit that converts the first intermediate frequency signal into a second intermediate frequency signal and outputs the second intermediate frequency signal to the variable gain circuit. Receiver.