Patent ID: 8405147

Claim:
An RF switch, comprising: a first RF port; a second RF port; a first switch transistor grouping coupled with the first and second RF ports, and controlled by a first switch control signal, the first switch transistor grouping comprising a first plurality of switch NMOSFETs arranged in a stacked configuration; a shunt transistor grouping coupled with the first RF port and with ground, and controlled by a shunt control signal, the shunt transistor grouping comprising a plurality of shunt NMOSFETs arranged in a stacked configuration, wherein at least one of the plurality of shunt NMOSFETs comprises a first body and a first accumulated charge sink (ACS) coupled with the first body and is configured so that when the at least one shunt NMOSFET is disabled, a first negative bias voltage that is substantially negative with respect to ground applied to the first ACS substantially prevents accumulated charge from accumulating in the first body of the at least one shunt NMOSFET, and wherein the at least one shunt NMOSFET includes a gate, drain, source, and a gate oxide layer positioned between the gate and the first body, and wherein accumulated charge will accumulate within the first body in a region proximate the gate oxide layer if the first ACS is not properly biased to prevent accumulated charge from accumulating in the first body; and a silicon-on-insulator substrate, wherein the first switch transistor grouping and the shunt transistor grouping are fabricated in a silicon layer of the silicon-on-insulator substrate so that when the first switch transistor grouping is enabled by the first switch control signal and the shunt transistor grouping is disabled by the shunt control signal, the first RF port is electrically coupled to the second RF port, and when the first switch transistor grouping is disabled by the first switch control signal and the shunt transistor grouping is enabled by the shunt control signal, the first RF port is grounded.