Antenna port termination in absence of power supply
AssigneepSemi Corporation
InventorSivakumar Ganesan
Life of this patent
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Abstract
Methods and devices to address antenna termination in absence of power supplies within an electronic circuit including a termination circuit and a switching circuit. The devices include regular NMOS devices that decouple the antenna from the switching circuit in absence of power supplies while the antenna is coupled to a terminating impedance having a desired impedance value through a native NMOS device. The antenna is coupled with the switching circuit via the regular NMOS device during powered conditions while the antenna is decoupled from the terminating impedance.
Claims19
An electronic circuit comprising:
- a termination circuit including a first switch, the first switch selectively coupling an antenna to ground;
- a switching circuit;
- and
- a second switch coupling the antenna and the termination circuit to the switching circuit,
- wherein a threshold voltage of the first switch is less than a threshold voltage of the second switch.
A method of terminating an antenna comprising:
- providing a switching circuit including a plurality of switching transistors;
- coupling the antenna to ground through a first switch, the first switch having a first threshold voltage, and
- coupling the antenna to the switching circuit through a second switch, the second switch having a second threshold voltage being greater than the first threshold voltage.
Dependencies are inferred from the claim text.