| 摘要 |
Electronic circuitry for simulating the resistance characteristics of a variable resistance temperature sensing element includes a multiplier that multiplies the difference between a reference voltage and a desired value of a control voltage times the voltage across a precision resistor at the output of the circuitry. The multiplier product output signal is integrated and a voltage value of the integrator output controls the gate terminal of a field effect transistor. The drain and source terminals of the transistor are connected in series with the precision resistor. The combination of the current through the precision resistor and the transistor (or the voltage across the precision resistor), together with the voltage value of the control signal, controls the voltage input value to the integrator, which, in turn, controls the resulting resistance across the output terminals of the transistor.
|
