RF RECEIVER, SPECIFICALLY IN REFERENCE TO REGULARLY MAINTAINING SIZE OF AN OUTPUT SIGNAL WITHOUT GENERATING A SIGNAL DISTORTION

摘要

PURPOSE: An RF receiver is provided to perform a channel select filtering process, and to control a gain of a channel select filter by using an output value of an RSSI(Received Signal Strength Indicator) for detecting a size of an input signal, thereby regularly maintaining a size of an output signal. CONSTITUTION: A channel select filter(10) is realized as a multi-complex filter by using an active RC filter, and varies a gain. An RSSI(20) extracts a size of an input signal of the channel select filter(10), and outputs a multi-bit signal which varies the gain with the channel select filter(10). The channel select filter(10) includes a resistance array which controls a resistance value by the outputted multi-bit signal. The resistance array consists of plural resistances serially connected between an input terminal and an output terminal, and plural switch units connected to each terminal of each resistance.