Question
The output of a particular thermistor circuit is designed to provide +4mV per 1C. It has a series resistance of 100. This signal will be
The output of a particular thermistor circuit is designed to provide +4mV per 1C. It has a series resistance of 100. This signal will be monitored by a 0V-to-5V Analog-to-Digital Converter (ADC), however there is some non-linearity at 5V, so the input to the ADC should be limited 4.8V. The input resistance of the ADC is 1k. You are expecting to measure a temperature range of 0C : 30C. There is an ambient noise (present from the operating environment) in the circuitry of 1kHz. The maximum noise amplitude expected in 60mV. The input to the ADC cannot have more than 5% ripple with respect to the average output peak (IE: if the output peak bounces between 4.98 and 5.00V, there is 2mV of ripple around 4.99V, which is 0.04% ripple).
Consider the information provide for the measurement signal (not including the noise) and determine the maximum expected voltage from the measurement. Determine the required gain. Consider the need of a buffer amp, explain your decision. Draw the circuit schematic that accomplishes this task.
Modify the design:
The objective of our thermistor circuit is to protect a data server. The servers typically operate at room temperature, but as their workload intensifies, they produce a lot of heat. All we care about is how much above room temperature is the operating environment. The output of the thermistor circuit is 2V at room temperature (20C). We want to accurately measure the temperature between 20C and 50C, the same 30 range as above, but offset by 2V. Design a circuit to remove this 2V bias. Hint: this is easiest if you start with a subtraction stage to subtract +2V with no amplification, then amplify the output of that stage with the circuit you already designed abo
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