Patent ID: 7308241
Filing Date: 2007-12-11
Classification: H03H,H04B

Abstract:
1. A receiver system comprising: an antenna for receiving a high-frequency signal; an amplifier for amplifying the high-frequency signal output from said antenna; a local oscillator for producing a local oscillation signal; a mixer for mixing an output signal of said amplifier and the local oscillation signal to produce an intermediate signal; and a band-pass filter circuit for eliminating unnecessary frequency components from an output signal of said mixer, wherein said band-pass filter circuit is composed of a low-pass filter that receives the output signal of said mixer and a band-pass filter that receives an output signal of said low-pass filter, a value obtained by diving a higher cutoff frequency of said band-pass filter by a lower cutoff frequency thereof is smaller than 2, and a cutoff frequency of said low-pass filter is higher than a center frequency of said band-pass filter.