Operational Amplifiers (Op Amps)
3. Input impedance looking into the input terminals is large: . The larger input impedances are found on op amps with FET input stages (like the TL081). 4. Output impedance is small: Figure 19 shows a model of an op amp. Internal circuitry of an op amp can be found in its data sheet. The open-loop gain (A) of an op amp is large (105 – 106 ...
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TEMPERATURE SENSORS
www.eng.hmc.edu2. RESISTANCE TEMPERATURE DEVICE (RTD) Very Accurate and stable Reasonably wide temperature range More expensive (platinum) Positive Temperature Constant, and rather constant Requires current excitation Smaller Resistance range Self-heating is a concern Lead resistance is a concern Read AN 687 for more details (e.g. current excitation circuit):
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