US 11,381,228 B2 · Sensor output circuit

Abstract

A sensor output circuit is limited with high accuracy, and reduces radio wave radiation by signal transmission using a single-line signal. The sensor output includes a pulse signal Vin that changes according to a physical quantity to be measured, MOS transistors that perform on/off operations according to the pulse signal Vin, a constant current source that generates a constant current, a MOS transistor which generates a gate voltage of a MOS transistor, MOS transistors which form a current mirror circuit, and the MOS transistor which works to maintain a drain voltage of the MOS transistor at a constant voltage, and the output terminal which is driven by the MOS transistors connected in series. In addition, an output signal from the sensor output circuit is transmitted to a control circuit via an output signal line. The control circuit includes a pull-up resistor, a capacitor, and an input gate circuit.

Claims11

Dependent claims

A sensor output circuit having an output terminal that outputs a pulse signal, comprising:

a first MOS transistor that is driven by a constant current;
and
a second MOS transistor that is provided between the first MOS transistor and the output terminal,
wherein a source terminal of the second MOS transistor is connected to a drain terminal of the first MOS transistor,
a drain terminal of the second MOS transistor is connected to the output terminal,
a breakdown voltage between a drain and a source of the second MOS transistor is higher than a breakdown voltage between a drain and a source of the first MOS transistor, and
a capacitor is disposed on at least one of a gate terminal of the first MOS transistor and a gate terminal of the second MOS transistor.

4 more elements

Dependencies are inferred from the claim text.

Sensor output circuit

Life of this patent

Sensor output circuit

Life of this patent

Abstract

Claims11