Input protection circuit, electronic device, electronic apparatus, and moving object
AssigneeSeiko Epson Corporation
InventorsHidehiko Yajima, Satoru Kodaira
Life of this patent
Estimating the term…
Abstract
An input protection circuit changes the voltage of a signal to be input to an input circuit to a predetermined voltage or less and outputs the signal. The input protection circuit includes a first NMOS transistor and a second NMOS transistor. The the first NMOS transistor includes a source to which an input signal is input, a gate to which a voltage based on a first voltage is applied, and a drain that outputs the signal to the input circuit based on the input signal and the gate voltage. The second NMOS transistor includes a source and a gate to each of which the voltage based on the first voltage is applied, and a drain that outputs a second voltage to the input circuit.
Claims3
An input protection circuit that changes a signal voltage of a signal to be input to an input circuit to a predetermined voltage or less and outputs the signal, the circuit comprising:
- a first NMOS transistor including:
- a source to which an input signal is input,
- a gate to which a voltage is applied, the voltage being based on a first voltage, and
- a drain that outputs the signal to the input circuit, the signal being based on the input signal input to the source and the voltage input to the gate;
- and
- a second NMOS transistor including:
- a drain to which the voltage based on the first voltage is applied,
- a gate to which the voltage based on the first voltage is applied, and
- a source that outputs a second voltage to the input circuit based on the voltage applied to the drain and the gate;
- wherein the first NMOS transistor and the second NMOS transistor are both depletion transistors.
Dependencies are inferred from the claim text.