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26 Cards in this Set
- Front
- Back
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Coupling capacitors block ac and allow dc to pass. T/F
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False. It's the other way around.
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Loading is caused by what?
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A change of resistance on the load.
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RC coupling characteristics.
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Cheap, common, dc isolation.
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Voltage regulators have become _______.
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integrated
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Transistors are voltage-controlling. T/F
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False. current-controlling
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The final collector current of a darlington pair is equal to ________.
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Beta squared
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Where do P and N meet?
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PN Junction
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What steps do you use to check quiescense?
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1. at least .6 volts on the base (knee voltage); 2. forward bias (BE); 3. collector current.
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What does a degenerative cap do?
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Filters AC to ground.
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Neutral or static state between P and N.
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Depletion Zone.
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Heavily doped part of the transistor so it can pass a large quantity of current.
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Emitter
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Lightly doped and very thin part of the transistor.
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Base
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Moderately doped and largest in area so it can dissipate heat.
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Collector
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Amplifiers are defined by...
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Current relationships, class of operation, gain, biasing
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Linear representation of the current relationship in a transistor.
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Load line
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(Amp classes) High fidelity, low distortion, low efficiency
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A
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(Amp classes) Better efficiency, poor fidelity
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B
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(Amp classes) Base bias less than cut-off, very high efficiency, poor fidelity
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C
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Name the 4 types of transistor biasing.
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Emitter, combination, self, fixed (FSEC)
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Output to input is 180 degrees out of phase in this common amp.
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common emitter.
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What is Coupling?
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The transfer of energy or signals between circuits, stages, or systems.
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_________ and ________ are a major concern at higher gains in amplifiers.
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stability, predictability
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Common Emitter push-pull amps have opposite or similar transistors and also use what?
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similar, center-tap transformers
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Zener diode does what when in forward bias?
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Acts like a normal diode.
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To function, the zener must achieve this.
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Avalanche breakdown.
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The Zener diode keeps constant ______ over a wide range of _______.
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voltage, current
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