Capacitance compensation circuit of a radio frequency switch

摘要

An RF switch includes a transistor and a compensation capacitor circuit. The compensation capacitor circuit includes a first compensation capacitor and a second compensation capacitor of the same capacitance. The compensation capacitor circuit is used to improve voltage distribution between a control node and a first node of the transistor and between the control node and a second node of the transistor.

主权项

1. An RF (radio frequency) switch comprising:
a transistor having a first node, a second node, and a control node; a first compensation capacitor coupled between the control node and the first node of the transistor; a second compensation capacitor coupled between the control node and the second node of the transistor; a third compensation capacitor coupled between a well and the first node of the transistor; and a fourth compensation capacitor coupled between the well and the second node of the transistor; wherein a capacitance of the first compensation capacitor is substantially equal to a capacitance of the second compensation capacitor, and a capacitance of the third compensation capacitor is substantially equal to a capacitance of the fourth compensation capacitor.