Circuit current generation apparatus and method thereof, and signal processing apparatus

Abstract

A semiconductor integrated circuit for use in a receiver can reduce fluctuations in characteristics caused by fluctuations in current to thereby reduce dissipation power. A bias current detection circuit and a current control circuit are provided to decrease a current of a high-frequency circuit if a bias current is large and, if the bias current is small, increase the current of the high-frequency circuit, so as to prevent characteristics of the high-frequency circuit from deteriorating and to reduce the current, thereby enabling reducing dissipation power.

1 . A signal processing apparatus comprising:
 a reception section which is connected to an antenna circuit operable to receive a broadcast signal having a desired frequency in order to convert said broadcast signal into a predetermined intermediate-frequency signal or baseband signal;   a current detection section operable to detect a bias current flowing in said reception section; and   a current control circuit operable to control the bias current of a high-frequency circuit in said reception section in accordance with an output of said current detection section.