Independent Control of Branch FETs for RF Performance Improvement

摘要

A FET-based RF switch architecture and method that provides for independent control of FETs within component branches of a switching circuit. With independent control of branch FETs, every RF FET in an inactive branch that is in an “open” (capacitive) state can be shunted to RF ground and thus mitigate impedance mismatch effects. Providing a sufficiently low impedance to RF ground diminishes such negative effects and reduces the sensitivity of the switch circuit to non-matched impedances.

主权项

1. A FET-based switch circuit including at least two switching branches, each switching branch including:
(a) at least two programmable gateway FET switches configured to be connected to external circuit elements; (b) a common node coupled to the at least two programmable gateway FET switches; and (c) a programmable shunt circuit connected to the common node for selectively isolating such switching branch independently of any other switching branch.