Patent ID: 8428531
Filing Date: 2013-04-23
Classification: H03J

Abstract:
1. A radio wave receiver comprising: an antenna for receiving a radio wave; a tuning unit that can discretely change a frequency characteristic of the antenna; a positive feedback section for performing a feedback operation to apply positive feedback to a signal path including the tuning unit so as to oscillate the antenna and a circuit portion of the tuning unit; a switch element for turning on and off the feedback operation performed by the positive feedback section; a reception processing section for extracting a signal of a desired wave out of a reception signal received from the antenna in a state in which the feedback operation performed by the positive feedback section is off; a controller for generating an oscillation signal at the circuit portion by the positive feedback section in a state in which the feedback operation performed by the positive feedback section is on, and switching a setting of the tuning unit to search for a setting state of the tuning unit in which the oscillation signal is extracted by the reception processing section; and a compensator for applying a variation to a frequency characteristic of the oscillation signal or a frequency characteristic associated with the signal extraction of the reception processing section when the controller searches for the setting state.