Patent ID: 8055223
Filing Date: 2011-11-08
Classification: H04B

Abstract:
1. A radio receiver including: a first down-converter for receiving a radio multiplexed signal containing a first signal and a second signal and down-converting the received radio multiplexed signal by a local oscillation signal from a local oscillator that is applied to an Nth order harmonic mixer, where N is a natural number greater than 2, and the frequency of the local oscillation signal from the local oscillator is set to a predetermined value based on N, the Nth order harmonic mixer then being configured to generate a first intermediate frequency signal; a second down-converter including a second mixer for multiplying the first intermediate frequency signal received from the first down-converter and a further signal extracted from the first intermediate frequency signal by a filter to down-convert the first intermediate frequency signal so as to generate a second intermediate frequency signal, wherein the second mixer includes a control section for controlling an operating bias of a component responsive to bias in the second mixer to widen dynamic range of the second mixer in response to a signal strength of at least either one of the first intermediate frequency signal or the further signal, the control section has a resistor, and the resistor controls a current generated from the component responsive to bias in the second mixer to control an operating bias of the component responsive to bias in the second mixer.