Patent ID: 6600911
Filing Date: 2003-07-29
Classification: H04B

Abstract:
An even harmonic direct-conversion receiver, comprising:an antenna configured to receive and output a received wave having a received wave frequency; an amplifier configured to amplify said received wave and to output an amplified signal; a bandpass filter disposed after said amplifier and configured to output a bandpass limited amplified signal; a local oscillator configured to output a local oscillation wave having an oscillation wave frequency at approximately half said received wave frequency; an even harmonic quadrature mixer configured to mix said bandpass limited amplified signal with said local oscillation wave and to output a baseband signal; a signal processing circuit configured to demodulate said baseband signal; and a filter device disposed before said amplifier, said filter device configured to pass said received wave and to substantially suppress a frequency band corresponding to said oscillation wave frequency.