Patent ID: 6201455
Filing Date: 2001-03-13
Classification: H01P,H04B

Abstract:
An antenna switch circuit comprising:an input terminal and an output terminal;a field effect transistor connected at a first one of a source electrode and a drain electrode thereof to said input terminal and connected at a second one of said source electrode and said drain electrode to said output terminal;first, second, and third biasing elements;a first controlling power supply to which said drain electrode and said source electrode of said field effect transistor are connected through said first and second biasing elements, respectively;a second controlling power supply to which a gate electrode of said field effect transistor is connected through said third biasing element; anda phase shifting element and a feedback resistor connected in series between said second one of said source electrode and said drain electrode and said gate electrode of said field effect transistor, whereinsaid field effect transistor is controlled between on and off by varying a voltage of at least one of said first and second controlling power supplies, wherein each of said first, second, and third biasing elements is a coil.