Isolated bidirectional high-voltage analog switch
AssigneeSunlite Science & Technology, Inc.
InventorsHaijiang Ou, Xiaofang Suo
Life of this patent
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Abstract
Embodiments of the present disclosure include a bidirectional analog switch having a pair of high-voltage transistors coupled together via a common source and gate. The switches are configured to effectively isolate an input terminal from an output terminal by passing leakage and feedthrough to a power supply. In certain embodiments, an off-state pinned switch pins the common source voltage to a power source voltage. A logic circuit receives an input logic signal and generates two non-overlapped output logic signals for controlling the pair of transistors and the off-state pinned switch. In other embodiments, a resistor pins the common source voltage to a power supply voltage for passing leakage and feedthrough to the power supply.
Claims20
An isolated bidirectional high-voltage analog switch between an input terminal and an output terminal, comprising:
- a first transistor operatively coupled to a second transistor via a common source and a common gate;
- a level shifter operatively coupled to the common source and the common gate;
- a logic circuit configured to receive a switch control pulse and generate a first pulse and a second pulse that is non-overlapped from the first pulse, wherein the level shifter is configured to receive the first pulse for controlling a voltage difference between the common source and the common gate;
- and
- an off-state pinned switch operatively coupled to the common source and configured to pin the voltage of the common source to a low-voltage power source, wherein the off-state pinned switch is configured to receive the second pulse for controlling the off-state pinned switch.
A bidirectional analog switch, comprising:
- a first transistor operatively coupled to an input terminal;
- a second transistor operatively coupled to an output terminal, wherein the first transistor and the second transistor are coupled together via a common source and a common gate;
- a level shifter operatively coupled to the common source and the common gate for controlling a voltage difference therebetween;
- an off-state pinned circuit operatively coupled to the common source and configured to pin the voltage of the common source to a high-voltage source;
- and
- a logic circuit configured to receive an input logic signal, generate a first output logic signal for controlling the level shifter, and generate a second output logic signal for controlling the off-state pinned circuit, such that leakage and feedthrough from the input terminal and the output terminal are passed to the high-voltage power source, thereby isolating the input terminal from the output terminal.
A high-voltage bidirectional analog switch, comprising:
- a first transistor operatively coupled to an input terminal;
- a second transistor operatively coupled to an output terminal, wherein the first transistor and the second transistor are coupled together via a common source and a common gate;
- a level shifter operatively coupled to the common source and the common gate for controlling a voltage difference therebetween;
- a pull-down resistor that couples the common source to a low-voltage power supply such that leakage and feedthrough from the input terminal and the output terminal are substantially passed to the low-voltage power supply, thereby effectively isolating the input terminal from the output terminal.
A high-voltage bidirectional analog switch, comprising:
- a first transistor operatively coupled to an input terminal;
- a second transistor operatively coupled to an output terminal, wherein the first transistor and the second transistor are coupled together via a common source and a common gate;
- a level shifter operatively coupled to the common source and the common gate for controlling a voltage difference therebetween;
- a pull-up resistor that couples the common source to a high-voltage power supply such that leakage and feedthrough from the input terminal and the output terminal are substantially passed to the high-voltage power supply, thereby effectively isolating the input terminal from the output terminal.
Dependencies are inferred from the claim text.