19 (3 points) A CS amplifier has a load resistance of 10 k and RD = 820 . If gm = 500 mS , Vin = 500 mV, the output signal voltage is Question 19 options: 1.89 V 2.05 V 25 V 0.5 V Question 20 (3 points) If the barrier potential of a diode is exceeded, the forward current will Question 20 options: decrease not change increase Question 21 (3 points) For an op-amp with negative feedback, the output is Question 21 options: feedback to noninverting input feedback to inverting input feedback to noninverting input and feedback to inverting input Question 22 (3 points) If a certain zener diode has a zener voltage of 3.6 V, it operates in Question 22 options: regulated breakdown zener breakdown forward conduction avalanche breakdown Question 23 (3 points) For operation as an amplifier, the base of an npn transistor must be: Question 23 options: positive with respect to the emitter negative with respect to the emitter positive with respect to the collector 0 V