The circuit belów represents an amplifier based on a JFET transistor. The characteristics of this JFET transistor are: Saturation current: Ipss= 10 mA Pinch-off voltage: Va(ofn= -4 V VpD= 20V, Ves= -2,2v, R1= 240M2, R2= 47MQ, RD= 3k2, R;= 1.1kN, R1= 4.7k2. a) Calculate the Q point of the transistor Ino et VDsQ b) Calculate the transconductance gm of the transistor. c) Draw the equivalent DC and AC circuits of the amplifier. VDD Rp R Vout Vin Key Formulas: Ves Ip = Ipss 1 - JFET/D-MOSFET transfer characteristic VGs Vasto"). &m = 8mo 1 - Transconductance 21 pss gmo Transconductance at Vas = 0

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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.