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US 11,699,995 B2Granted
Multiplexer with highly linear analog switch
AssigneeSTMicroelectronics International N.V.
InventorsVaibhav Garg, Abhishek Jain, Anand Kumar
Life of this patent
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Abstract
A multiplexer includes an input, an output, and a main switch configured to pass a signal from the input to the output. The multiplexer includes two bootstrap circuits that collectively maintain a constant voltage between terminals of the main switch during alternating phases.
Claims19
A multiplexer, comprising:
- an input terminal;
- an output terminal;
- a main switch coupled between the input terminal and the output terminal and configured to pass a signal between the input terminal and the output terminal, wherein the main switch is a transistor including:
- a source terminal coupled to the input terminal;
- a drain terminal coupled to the output terminal;
- and
- a gate terminal;
- a first boot strap circuit including a first bootstrap capacitor and configured to couple the first bootstrap capacitor to the main switch during a first phase and to decouple the first bootstrap capacitor from the main switch during a second phase;
- and
- a second boot strap circuit including a second bootstrap capacitor and configured to couple the second bootstrap capacitor to the main switch during the second phase and to decouple the second bootstrap capacitor from the main switch during the first phase, wherein during the first phase the first bootstrap capacitor is coupled between the source and gate terminals of the transistor and the second bootstrap capacitor is decoupled from the source and gate terminals of the transistor.
7 more elements
A method, comprising:
- coupling a main switch between an input terminal and an output terminal of a multiplexer;
- passing a signal between the input terminal and the output terminal;
- coupling a first boot strap circuit including a first bootstrap capacitor to the main switch during a first phase and decoupling the first bootstrap capacitor from the main switch during a second phase;
- and
- coupling a second boot strap circuit including a second bootstrap capacitor to the main switch during the second phase and decoupling the second bootstrap capacitor from the main switch during the first phase;
- coupling a source terminal of the main switch to the input terminal and coupling a drain terminal of the main switch to the output terminal;
- and
- coupling, during the first phase, the first bootstrap capacitor between the source terminal and a gate terminal of the main switch and decoupling the second bootstrap capacitor from the source and gate terminals of the main switch.
5 more elements
A device, comprising:
- an input terminal;
- an output terminal;
- a transistor having a source, drain, and gate, the source coupled to the input terminal and the drain coupled to the output terminal, the transistor configured to pass a signal between the input terminal and the output terminal;
- a first boot strap circuit including a first bootstrap capacitor and configured to couple the first bootstrap capacitor to the transistor during a first phase and to decouple the first bootstrap capacitor from the transistor during a second phase;
- and
- a second boot strap circuit including a second bootstrap capacitor and configured to couple the second bootstrap capacitor to the transistor during the second phase and to decouple the second bootstrap capacitor from the transistor during the first phase, wherein during the first phase the first bootstrap capacitor is coupled between the source and gate terminals of the transistor and the second bootstrap capacitor is decoupled from the source and gate terminals of the transistor.
3 more elements
The device of 11, wherein during the second phase the second bootstrap capacitor is coupled between the source and gate terminals of the transistor and the first bootstrap capacitor is decoupled from the source and gate terminals of the transistor.
Dependencies are inferred from the claim text.