Analog Switch For Transmitting High Voltage Signals Without Utilizing High Voltage Power Supplies

摘要

Described herein are multiple designs for an improved analog switch for use in transmitting high voltage signals without using high voltage power supplies for the switch. The analog switches are able to pass and block input signals in the approximate range of −100V to +100V. The use of translinear loops and a bootstrap configuration results in a constant on-resistance of the symmetrical switches and matches the conductance of each analog switch to the transconductance of an NMOS transistor, which can be easily stabilized with a constant gm biasing scheme. In certain embodiments, a shunt termination (T-switch) configuration is used for better off-isolation, and each of the symmetrical switches has its own translinear loop and thus flexibility of on-resistance and termination voltage.

主权项

1. An analog switch, comprising:
an input node on a terminal of a first transistor for receiving a high voltage input signal; one or more control nodes for receiving a control signal; an output node on a terminal of a second transistor for presenting the high voltage input signal when the control signal is at a first voltage and for blocking the high voltage input signal when the control signal is at a second voltage; and a shunt circuit connected to a node between the first transistor and the second transistor, wherein the shunt circuit terminates to ground and is not connected to a power supply that supplies a voltage with an absolute value greater than the absolute value of the voltage of the high voltage input signal.