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US 12,149,241 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.
Claims20
A multiplexer, comprising:
- an output terminal;
- a plurality of input terminals;
- and
- a plurality of switch circuits each coupled between the output terminal and a respective input terminal, each switch circuit including:
- a main transistor coupled between the respective input terminal and the output terminal;
- a first boot strap circuit including a first bootstrap capacitor and configured to selectively couple and decouple the first bootstrap capacitor between a gate terminal and a source terminal of the main transistor;
- and
- a second boot strap circuit including a second bootstrap capacitor and configured to selectively couple and decouple the second bootstrap capacitor between a gate terminal and a source terminal of the main transistor.
5 more elements
A method, comprising:
- selecting a switch circuit from a plurality of switch circuits of a multiplexer including a plurality of input terminals and an output terminal, each switch circuit coupled between a respective input terminal and the output terminal, each switch circuit including, a main transistor coupled between the input terminal and the output terminal of the multiplexer, a first bootstrap circuit, and a second bootstrap circuit;
- passing a signal from the input terminal coupled to the selected switch circuit through the main transistor of the selected switch circuit to the output terminal of the multiplexer;
- coupling the first bootstrap circuit of the selected switch circuit between a gate terminal and a source terminal of the main transistor of the selected switch circuit during a first phase;
- and
- coupling the second bootstrap circuit between the gate terminal and the source terminal of the main transistor of the selected switch circuit during a second phase alternating with the first phase.
2 more elements
An integrated circuit, comprising:
- a multiplexer, including:
- a plurality of inputs;
- an output;
- a plurality of switch circuits coupled between an output terminal and a respective input terminal, each switch circuit including:
- a main transistor having a source terminal coupled to the input, a drain terminal coupled to the output, and a gate terminal;
- a first bootstrap circuit having a first capacitor configured to be selectively coupled to and decoupled from the input;
- and
- a second bootstrap circuit having a second capacitor configured to be selectively coupled to and decoupled from the input.
5 more elements
Dependencies are inferred from the claim text.