The attached circuit is adapted from an article originally published in EDN magazine. In the article titled "Test your analog-design IQ" by Jim Williams, this was question #14 in conjunction with Figure 9. The challenge was to find the temperature sensor in the circuit. The instrumentation amplifier in the figure had no components with values so I just made one up. I've never had to use or design one before so I was a bit unsure of the scale. I got a reasonable gain of ≈ 126 on the second try. This was also the first time I've done a temperature sweep in LTspice. I thought some other simulation aficionados might enjoy it as well.
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