Patent ID: 6496684
Filing Date: 2002-12-17
Classification: H03K

Abstract:
A single pole double throw (SPDT) switch, comprising:a first terminal, a second terminal, and a control terminal; a field effect transistor (FET) having a gate connected to the control terminal, a drain connected to the first terminal, and a source, the FET exhibiting an OFF capacitance from drain to source; a capacitor element having a capacitance substantially equal to the OFF capacitance of the FET, the capacitor element having one end connected to the first terminal and another end connected to the second terminal; an induction element having one end connected to the source of the FET and another end connected to the second terminal, an inductance of the induction element being set such that it resonates with the capacitor element at a signal frequency; and a switching element having first and second signal terminals and a switching terminal, the first signal terminal being coupled to the third terminal, the second signal terminal being coupled to the first terminal and the switching terminal being coupled to the control terminal such that the switching element is turned on and off synchronously with the FET.