| 摘要 |
<p>A variable gain amplifier comprises a first amplifier circuit (106), a gate bias control circuit (102), and a variable matching circuit (103). The first amplifier circuit (106) has a first field effect transistor and amplifies and outputs a signal received by the gate of the first field effect transistor. The gate bias control circuit (102) controls the gain of the first amplifier circuit by controlling the gate bias of the first amplifier circuit. The variable matching circuit (103) controls the gain of the first amplifier circuit by controlling a capacitor connected to the gate of the first amplifier circuit.</p> |
