ATT Week 5 Exam Questions & Answers

Limiting action happens in series when a diode is________ and in parallel when a diode is________. - Answer Reverse biased, forward biased. What is the purpose of a diode limiting circuit? - Answer To limit amplitude of the input. What do clampers do? - Answer Add DC to AC signal. A transistor in a Common Emitter transfers an internal resistance from a low resistance in emitter base to? - Answer High resistance in collector base. Ie (Emitter current) = ? - Answer Ib (base current) + Ic (collector current) When does cutoff occur in a Common Emitter? - Answer When Emitter PN junction is reversed. A Common Emitter has a gain of how much? - Answer 10 How does a Common Emitter affect the phase of an input signal? - Answer It inverts the input 180° (flip) A Common Collector has a gain of how much? - Answer 1 (no phase inversion) A Common Base has a gain of how much? - Answer 10 (no phase inversion) How do transistor amplifiers operate? - Answer By an AC input signal changing base bias. The component that develops bias for a transistor part is directly connected to the_________. - Answer Corresponding transistor part. In a Common Emitter, if base voltage (base bias) increases, emitter current does what? - Answer Increases. A small input controls a__________. - Answer Large output What is the most common type of Multi-stage Amplifier? - Answer RC (Resistive-capacitive) What is the purpose of Cascade amplifiers? - Answer To increase Av (Voltage Gain) How is AvT (Total voltage gain) calculated in a Cascade Amplifier? - Answer The product of individual stage gains (Q1xQ2xQ3x...=AvT) What is the typical gain for a three stage cascade amplifier (assumed value)? - Answer 1,000 What is Cascading? - Answer The connecting of multiple amplifiers in series.