| 摘要 |
PROBLEM TO BE SOLVED: To provide an amplifier that decides a bias operating point with a single power supply.SOLUTION: The amplifier includes: a FET 11 for amplifying an input signal input into a gate electrode G and outputting an amplified output signal from a drain electrode D; and a bias circuit 12 comprising a capacitor 121 and a resistive element 122 connected in parallel between a source electrode S of the FET 11 and a ground GND. The FET 11 has the gate electrode G connected to the ground GND, and a voltage applied between the gate electrode G and the source electrode S in response to a voltage drop Va across the bias circuit 12 adjusts a drain current Id flowing from the drain electrode D to the source electrode S. |
