Bidirectional analog multiplexer
AssigneeSTMicroelectronics (Grenoble 2) SAS
InventorsThierry Masson, Pawel Fiedorow
Life of this patent
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Abstract
An analog multiplexer includes inputs and one output. A switching circuit is coupled between each input and the output. Each switching circuit includes an NMOS switching module, having an on state and an off state, and a control module supplied by a first supply voltage and operating to reduce leakage currents of the NMOS switching module when in the off state. The control module further operates to make the first NMOS switching module bidirectional irrespective of voltages present at the input and at the output.
Claims32
An analog multiplexer, comprising:
- a plurality of inputs and one output;
- a plurality of switching circuits, each switching circuit respectively coupled between one of the inputs and the output;
- wherein each switching circuit comprises:
- a transistor switch circuit controllable in an on state and an off state, and
- a control circuit that receives a supply voltage and is configured to reduce leakage currents of the transistor switch circuit when in the off state, and further configured to make the transistor switch circuit operate in a bidirectional manner irrespective of voltages present at the corresponding input and output.
An analog multiplexer, comprising:
- a plurality of inputs and one output;
- a plurality of switching circuits, each switching circuit respectively coupled between one of the inputs and the output;
- wherein each switching circuit comprises:
- a transistor switch circuit controllable in an on state and an off state;
- a control circuit configured to receive a supply voltage and operate to reduce the leakage currents of the transistor switch circuit when in the off state, and
- at least one voltage selection circuit configured to deliver the supply voltage that is at least greater than a highest of the voltages present at the input and at the output.
A bidirectional switching circuit coupled between an input and an output, wherein the bidirectional switching circuit comprises:
- a transistor switch circuit controllable in an on state and an off state, and
- a control circuit that receives a supply voltage and is configured to reduce leakage currents of the transistor switch circuit when in the off state, and further configured to make the transistor switch circuit operate in a bidirectional manner irrespective of voltages present at the corresponding input and output.
A bidirectional switching circuit coupled between an input and an output, wherein the bidirectional switching circuit comprises:
- a transistor switch circuit controllable in an on state and an off state;
- a control circuit configured to receive a supply voltage and operate to reduce the leakage currents of the transistor switch circuit when in the off state, and
- at least one voltage selection circuit configured to deliver the supply voltage that is at least greater than a highest of the voltages present at the input and at the output.
Dependencies are inferred from the claim text.