Parasitic isolation communication switch
AssigneeFairchild Semiconductor Corporation
InventorNickole Gagne
Life of this patent
Estimating the term…
Abstract
This document discusses, among other things, a switch multiplexer having a common connector, the switch multiplexer including a first switch configured to receive a first signal at or above a ground (GND) reference and a second switch configured to receive a second signal that swings positive and negative about ground. The switch multiplexer includes a negative charge pump configured to bias the first switch with a negative charge pump voltage lower than the most negative voltage swing of the second signal when the second switch is enabled, and to bias the first switch with GND when the first switch is enabled.
Claims16
A system comprising:
- a switch multiplexer (MUX) having a common connector, the switch MUX including:
- a first switch configured to receive a first signal, wherein the first signal is at or above a ground (GND) reference;
- and
- a second switch configured to receive a second signal, wherein the second signal swings positive and negative about GND;
- a negative charge pump configured to bias the first switch with a negative charge pump voltage lower than the most negative voltage of the second signal when the second switch is enabled, and to bias the first switch with GND when the first switch is enabled.
A method comprising:
- receiving a first signal at a first switch, wherein the first signal is configured to be at or above a ground (GND) reference;
- receiving a second signal at a second switch, wherein the second signal is configured to swing positive and negative about GND;
- biasing the first switch with a negative charge pump voltage lower than the most negative voltage of the second signal using a negative charge pump when the second switch is enabled;
- and
- biasing the first switch with GND using the negative charge pump when the first switch is enabled.
Dependencies are inferred from the claim text.