Armstrong & Kubovcik
Receiver circuit having first and second amplifiers
 A receiver circuit includes a first amplifier for amplifying an input signal and for outputting a first amplified signal, a first bias circuit coupled to the first amplifier for supplying a first bias current to the first amplifier, where the first amplifier and the first bias circuit form a first circuit part, a second amplifier coupled to the first amplifier for amplifying the first amplified signal output from the first amplifier and for outputting a second amplified signal as an output signal of the receiver circuit, and a second bias circuit coupled to the second amplifier for supplying a second bias current to the second amplifier, where the second amplifier and the second bias circuit form a second circuit part, and the first and second bias circuits are independent of each other and have mutually opposite temperature characteristics so that the first and second bias currents respectively change in mutually opposite directions with increasing ambient temperature, to thereby suppress a change in current consumption of the receiver circuit as a whole. According to the receiver circuit of the present invention, it is possible to stabilize the operation and current consumption of the receiver circuit with respect to the change in ambient temperature, and thus, it is possible to improve the detection accuracy of the receiver circuit especially with respect to a weak input signal. 
Fujitsu Limited Fujitsu VLSI Limited
H H
H03F H03F
additional inventional
Hidenobu
Ito