Temperature sensor circuit
A temperature sensor and circuit technology, applied in thermometers, instruments, scientific instruments, etc., can solve the problems of temperature sensor circuit reduction accuracy, emitter current change, etc., to achieve the effect of change suppression and high precision
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no. 1 example
[0021] A temperature sensor circuit according to the first embodiment will be described. figure 1 is a schematic diagram showing the temperature sensor circuit according to the first embodiment.
[0022] The temperature sensor circuit includes a constant current circuit 101 , a Darlington compound circuit and a current control circuit 301 . The constant current circuit 101 includes a constant current source 201 and a first current mirror circuit composed of MOS transistors 401 to 404 having the same size. The Darlington circuit includes bipolar transistors 601 to 603 having the same size. The drains of the MOS transistors 402 to 404 of the constant current circuit 101 are connected to the corresponding emitters of the bipolar transistors 601 to 603 of the Darlington circuit. The current control circuit 301 includes a second current mirror circuit composed of MOS transistors 501 to 503 . The MOS transistors 502 and 503 of the current control circuit 301 are connected to the ...
no. 2 example
[0034] Next, a temperature sensor circuit according to a second embodiment will be described. figure 2 is a schematic diagram showing a temperature sensor circuit according to the second embodiment.
[0035] The temperature sensor circuit according to the second embodiment is different from the temperature sensor circuit according to the first embodiment in that the input terminal 012 is omitted and a bipolar transistor 605 equal in size to the bipolar transistor 603 is added to the current control circuit 301 to A current control circuit 301a is provided.
[0036] The collector of the bipolar transistor 603 is connected to the emitter of the bipolar transistor 605 . The base of the bipolar transistor 605 is connected to the drain of the MOS transistor 501 .
[0037] Unlike the first embodiment, current is not supplied from the input terminal 012 to the MOS transistor 501 . The emitter current of bipolar transistor 603 is substantially equal to the emitter current of bipol...
no. 3 example
[0040] Next, a temperature sensor circuit according to a third embodiment will be described. image 3 is a schematic diagram showing a temperature sensor circuit according to the third embodiment.
[0041] The temperature sensor circuit according to the third embodiment differs from that according to the second embodiment in that a MOS transistor 405 equal in size to MOS transistors 401 to 404 is added to a constant current circuit 101 to provide a constant current circuit 101a.
[0042] The drain of the MOS transistor 405 is connected to the emitter of the bipolar transistor 605 . The base of the bipolar transistor 605 is connected to the drain of the MOS transistor 501 .
[0043] With this current mirror circuit, the drain current of the MOS transistor 404 is equal to the drain current of the MOS transistor 405 , and therefore, a current having a current value substantially equal to the base current Ib603 of the bipolar transistor 603 is supplied to the MOS transistor 501 ....
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