H/W Another method of digital-to-analog conversion is the R/2R ladder, as shown in Figure below for four bits. It overcomes one of the problems in the binary- weighted-input DAC in that it requires only two resistor values. 200 kN 10 kN Do Do oW 100 k2 50 kN D2 D2 0W O Output 25 k2 D3

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Thermistors

A thermistor is a special type of resistor whose resistance is more temperature-dependent than standard resistors.  The resistance of the thermistor decreases with increasing temperature. This is the basic principle of thermistors. This allows the thermistor circuit to detect very small temperature changes that cannot be observed with the Resistance temperature detectors (RTDs) or the thermocouples. Since the resistance of a thermistor is temperature dependent, it can be connected to an electrical circuit to measure body temperature. This high sensitivity to temperature changes makes thermistors very useful for accurately controlling and calibrating temperature measurements. In general, resistance increases with increasing temperature in most metals, but thermistors react negatively.