TWO-TERMINAL SEMICONDUCTOR SENSOR DEVICE
First Claim
1. A two-terminal semiconductor sensor device to be connected to an external device through two terminals, comprising:
- a first external terminal to be connected to a ground potential that is common to the external device;
a second external terminal for receiving an operating current from the external device;
a sensor circuit for measuring one physical amount to output a voltage based on the one physical amount;
a voltage dividing circuit for dividing a voltage between the first external terminal and the second external terminal to output a divided voltage;
a differential amplifier circuit for receiving the voltage output from the sensor circuit and the divided voltage to output a voltage based on a difference therebetween; and
an output transistor having a gate connected to an output terminal of the differential amplifier circuit, a drain connected to one of the first external terminal and the second external terminal, and a source connected to another one of the first external terminal and the second external terminal.
5 Assignments
0 Petitions
Accused Products
Abstract
Provided is a two-terminal semiconductor sensor device with which an external device having low circuit or element accuracy may be used. An output voltage (VOUT) of the two-terminal semiconductor sensor device based on temperature is not based on a constant current of a constant current source (70) of the external device and a current of an output transistor (60) of the two-terminal semiconductor sensor device, but on a resistance ratio of a voltage dividing circuit including a resistor (30) and a resistor (40), and a temperature voltage (Vbe) of the two-terminal semiconductor sensor device. Accordingly, accuracy of the constant current of the constant current source (70) of the external device that receives the output voltage (VOUT) does not need to be high. Therefore, the external device does not need to have a highly accurate circuit or element for receiving the output voltage (VOUT).
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Citations
6 Claims
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1. A two-terminal semiconductor sensor device to be connected to an external device through two terminals, comprising:
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a first external terminal to be connected to a ground potential that is common to the external device; a second external terminal for receiving an operating current from the external device; a sensor circuit for measuring one physical amount to output a voltage based on the one physical amount; a voltage dividing circuit for dividing a voltage between the first external terminal and the second external terminal to output a divided voltage; a differential amplifier circuit for receiving the voltage output from the sensor circuit and the divided voltage to output a voltage based on a difference therebetween; and an output transistor having a gate connected to an output terminal of the differential amplifier circuit, a drain connected to one of the first external terminal and the second external terminal, and a source connected to another one of the first external terminal and the second external terminal. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification