Patent ID: 7130597

Claim:
A receiver having a high-frequency amplifier circuit for amplifying a modulated wave signal received via an antenna, a local oscillator for generating a predetermined local oscillation signal, a mixing circuit for mixing and outputting the modulated wave signal amplified by said high-frequency amplifier circuit and the local oscillation signal outputted from said local oscillator, an intermediate-frequency amplifier circuit for amplifying an intermediate-frequency signal outputted from said mixing circuit, and an intermediate-frequency filter for selectively outputting said intermediate-frequency signals, characterized in that at least said mixing circuit, said intermediate-frequency amplifier circuit, said intermediate-frequency filter and said local oscillator are integrally formed on a semiconductor substrate by using CMOS process or MOS process, and amplification elements included therein are formed by using p-channel type FETs, and characterized in that said mixing circuit, said intermediate-frequency amplifier circuit and said intermediate-frequency filter are cascade-connected, and with respect to said FETs multi-connected as said amplification elements included therein, a gate length L and a gate width W of said FETs placed in preceding stages are set at values larger than the gate length L and gate width W of said FETs placed in subsequent stages thereto.