Patent ID: 7274224

Claim:
A semiconductor device, comprising: an initial-stage source-follower amplifier including a first driver transistor, and a first load transistor that is connected to said first driver transistor and driven variably depending on a signal inputted to said first driver transistor; and a final-stage source-follower amplifier including a second driver transistor, and a load circuit that is connected to said second driver transistor and driven variably depending on a signal outputted from said second driver transistor, wherein a gate of said first load transistor is applied with a variable bias voltage, and said load circuit is applied with a variable control voltage to vary a dynamic resistance value of said load circuit, wherein said load circuit includes a plurality of second load transistors that are connected in parallel to each other, and wherein respective gates of said second load transistors are applied with respective variable bias voltages to vary respective resistance values of said second load transistors.