Patent ID: 7085587
Filing Date: 2006-08-01
Classification: H03D,H04B

Abstract:
1. A signal processing semiconductor integrated circuit device, comprising: a reception-system circuit including, a frequency converter which combines the amplified signal with an oscillation signal having a predetermined frequency to thereby effect frequency conversion on the combined signal; and a second amplifier circuit which is DC-coupled to the frequency converter and amplifies the signal frequency-converted by the frequency converter; said signal processing semiconductor integrated circuit device having a first operation mode in which the reception-system circuit is activated and a second operation mode in which the reception-system circuit is deactivated; wherein voltage reference circuits, which respectively generate bias voltages for current sources for supplying operating currents for the frequency converter means and the second amplifier circuit, are activated in response to a transition from the second operation mode to the first operation mode, and thereafter the bias voltages are transferred to the current sources of the frequency converter and the second amplifier circuit to thereby activate the frequency converter and the second amplifier circuit.