Patent ID: 7333574
Filing Date: 2008-02-19
Classification: H03G,H04L

Abstract:
1. An integrated circuit of a front-end type for receiving a high frequency signal, comprising: an RF circuit including a variable gain amplifier; a digital demodulating circuit including an amplification rate control circuit; switching means for switching between (a) inputting an internal signal, as an amplification rate control signal, into the variable gain amplifier via an automatic gain control loop, the internal signal being outputted from the digital demodulating circuit and (b) directly inputting fixed value signals, as additional amplification rate control signals, into the variable gain amplifier by opening the automatic gain control loop; and a switching circuit for switching between, in accordance with an output draw-out switching control signal, (a) inputting a base band analog output to the digital demodulating circuit, and (b) outputting the base band analog output to outside via an inspection-use output terminal, the base band analog output being outputted from the RF circuit, wherein the RF circuit and the digital demodulating circuit are integrated in one package, and the switching means are switched over in accordance with a switching control signal.