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US 9,438,223 B2Granted
Transistor based switch stack having filters for preserving AC equipotential nodes
AssigneeQUALCOMM Incorporated
InventorMaurice Adrianus de Jongh
Life of this patent
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Abstract
A device for switching a radio frequency (RF) signal includes two or more field-effect transistor (FET) unit cells in a stacked or chain topology, and gate or body node filtration circuitry that preserves RF equipotential nodes. The filtration circuitry may be capacitive or resistive-capacitive. The filtration circuitry may be included in each unit cell of the device or in a gate or body bias network that is common to all unit cells in the device.
Claims15
A device for switching a radio frequency (RF) signal, comprising:
- a plurality of field-effect transistors (FET) unit cell circuits configured as a FET stack, each FET unit cell circuit comprising a FET;
- a bias network circuit coupled to the FET stack;
- and
- a body filter included in the plurality of FET unit cell circuits, the body filter having a drain-source circuit, the drain-source circuit comprising a divider circuit defining a virtual node, the body filter including a body filter capacitance between a body node of the FET and the virtual node.
1 more element
A device for switching a radio frequency (RF) signal, comprising:
- a plurality of field-effect transistors (FET) unit cell circuits configured as a FET stack, each FET unit cell circuit comprising a FET;
- and
- a body bias network filter circuit coupled to a body node of each FET unit cell circuit, the body bias network filter circuit having a mid-node coupled to at least one drain-source node between a pair of successive FET unit cell circuits, the body bias network filter circuit having a body bias network filter capacitance coupled between the mid-node and the body node of each FET unit cell circuit.
Dependencies are inferred from the claim text.