Patent ID: 6118989
Filing Date: 2000-09-12
Classification: H01Q,H03F,H03G,H04W,Y02D

Abstract:
A high frequency variable gain amplifier device comprising:transistor amplifier means supplied at an input terminal with a high frequency signal;bypass switch means formed of a field-effect transistor connected across said input terminal and an output terminal of said transistor amplifier means for controlling a connection of a bypass path; andfeed switch means arranged in a power supply feeding path for connecting a power supply voltage at a power supply connection point to said transistor amplifier means, wherein a source electrode of said field-effect transistor is connected to said power supply connection point, so that said bypass switch means is controlled by an output of said feed switch means,wherein said bypass path is connected by said bypass switch means in response to a feed control signal shutting off a power supply to said transistor amplifier means, andsaid bypass path is disconnected by said bypass switch means in response to the feed control signal feeding the power supply to said transistor amplifier means.