Patent ID: 6449471
Filing Date: 2002-09-10
Classification: H03D,H04B,H04L

Abstract:
A wireless terminal device comprising:an antenna; and a receiving circuit for receiving a received radio-frequency signal from said antenna, said receiving circuit includes: a local oscillator, a first even harmonic mixer for mixing said received radio-frequency signal with a local oscillation signal supplied from said local oscillator to produce a first base band signal, a first high-pass filter for receiving the first base band signal from said first even harmonic mixer, and having a first cut-off frequency, a first variable gain amplifier for amplifying the first base band signal passed through said first high-pass filter to obtain a constant output level, and a second high-pass filter for receiving the first base band signal from said first variable gain amplifier, and having a second cut-off frequency higher than said first cut-off frequency.