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Simulating the positive temperature co-efficient using resistances
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ajay.chakkaravarthy 2 years ago
Hello peeps, I am currently working on a circuit that can simulate the function of KTY81-110 temperature sensor using resistances. The value of resistances have been obtained from the datasheet of the sensor for three diffrenent temperatures. The input is derived from a DC-DC converter and the value is 9V, 111mA.  I am trying to use a constant current diode (S-102T) to maintain the current at 1mA before deriving the output from the circuit. I am consfused with the placement of the CRD in the circuit. I am still a beginner with simulating sensors. So any advice, comments or flaws in this design is welcome. Thank you people :) ![image.png](//image.easyeda.com/pullimage/OSA4fGadCACkU7jivdUJOCh91p5uFPjXxILoJvl1.png)![image.png](//image.easyeda.com/pullimage/dRP6xPuzhwmRnfhM83FzovPO208eqE1w8WTk7tvn.png)
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andyfierman 2 years ago
Please post links to the datasheet and application notes for: the KTY81-110 temperature sensor and the S-102T constant current diode.
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andyfierman 2 years ago
Please also read: [https://docs.easyeda.com/en/Simulation/Headings/index.html](https://docs.easyeda.com/en/Simulation/Headings/index.html)
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ajay.chakkaravarthy 2 years ago
@andyfierman  The links are as follows S-102T   [https://www.mouser.de/datasheet/2/362/P22-23-CRD-1729293.pdf](https://www.mouser.de/datasheet/2/362/P22-23-CRD-1729293.pdf) KTY81-110 [https://www.nxp.com/docs/en/data-sheet/KTY81_SER.pdf](https://www.nxp.com/docs/en/data-sheet/KTY81_SER.pdf)<br> <br> Thank you
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ajay.chakkaravarthy 2 years ago
@andyfierman I will definitely read it. Thanks for sharing
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ajay.chakkaravarthy 2 years ago
@andyfierman I will definitely read it. Thanks for sharing
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andyfierman 2 years ago
Sorry but you circuit does not seem to make sense. The top schematic will provide a constant 1mA to any load connected from output to ground and presenting a voltage drop of less than about 6V (i.e. leaving at least 3V across the S-102T). This is irrespective of any of the other components in the circuit as long as the 9V rail stays up at 9V. The lower schematic will provide a constant 9V to any load connected from output to ground, irrespective of any of the other components in the circuit, as long as the 9V rail stays up at 9V.
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andyfierman 2 years ago
I think you should read this too: [https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a](https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a)<br> <br> and: 1. think carefully about what you are trying to achieve and;  2. write a Design Requirement Specification and;  3. write a How It Works document. This will focus your mind on what you want to do and how best to achieve it. It will also help others to help you.
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