Circuit and method for controlling charge injection in radio frequency switches
First Claim
1. A switch circuit, comprising:
- a) a plurality of switching transistors coupled in series to selectively convey a signal from an input of the series coupled switching transistors to an output of the series coupled switching transistors, wherein injected charge is generated at resistively-isolated nodes between the switching transistors; and
b) a plurality of charge injection control elements operatively coupled to the switching transistors, and wherein the charge injection control elements receive the injected charge from the resistively-isolated nodes and convey the injected charge to at least one node of the switch circuit that is not resistively-isolated.
1 Assignment
0 Petitions
Accused Products
Abstract
A circuit and method for controlling charge injection in a circuit are disclosed. In one embodiment, the circuit and method are employed in a semiconductor-on-insulator (SOI) Radio Frequency (RF) switch. In one embodiment, an SOI RF switch comprises a plurality of switching transistors coupled in series, referred to as “stacked” transistors, and implemented as a monolithic integrated circuit on an SOI substrate. Charge injection control elements are coupled to receive injected charge from resistively-isolated nodes located between the switching transistors, and to convey the injected charge to at least one node that is not resistively-isolated. In one embodiment, the charge injection control elements comprise resistors. In another embodiment, the charge injection control elements comprise transistors. A method for controlling charge injection in a switch circuit is disclosed whereby injected charge is generated at resistively-isolated nodes between series coupled switching transistors, and the injected charge is conveyed to at least one node of the switch circuit that is not resistively-isolated.
-
Citations
30 Claims
-
1. A switch circuit, comprising:
-
a) a plurality of switching transistors coupled in series to selectively convey a signal from an input of the series coupled switching transistors to an output of the series coupled switching transistors, wherein injected charge is generated at resistively-isolated nodes between the switching transistors; and
b) a plurality of charge injection control elements operatively coupled to the switching transistors, and wherein the charge injection control elements receive the injected charge from the resistively-isolated nodes and convey the injected charge to at least one node of the switch circuit that is not resistively-isolated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A method of controlling charge injection in a switch circuit, wherein the switch circuit comprises a plurality of switching transistors coupled in series to selectively convey a signal from an input of the series coupled transistors to an output of the series coupled transistors, comprising the steps of:
-
a) generating injected charge at resistively-isolated nodes between the series coupled switching transistors; and
b) conveying the injected charge to at least one node of the switch circuit that is not resistively-isolated. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
-
-
24. A switch circuit, comprising a plurality of switching transistors connected in a series configuration to selectively convey a signal from an input of the series coupled transistors to an output of the series coupled transistors, comprising:
-
a) means for generating injected charge at resistively-isolated nodes between the switching transistors; and
b) means, operatively coupled to the generating means, for conveying the injected charge to at least one node of the switch circuit that is not resistively-isolated. - View Dependent Claims (25, 26, 27, 28, 29, 30)
-
Specification