33624583
Description
Flashcards by That Yeti Dog Person, updated more than 1 year ago
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Created by That Yeti Dog Person
over 2 years ago
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| Question | Answer |
| A _____ is a three-terminal, solid-state semiconductor that's used to control the flow of electrons in a circuit. | transistor |
| The word "transistor" is a shortened form of "____________", and this is a good description of what a transistor does in a circuit. | current-transferring resistor |
| A transistor is made from ____ layers of doped semiconductor crystals (usually silicon or germanium). | three |
| The three layers in a transistor can be arranged in either ___ formation or ___ formation. | NPN, PNP |
| An ___ transistor contains a thin layer of p-type material sandwiched between two N-type layers. | NPN |
| The ___ transistor contains a thin layer of N-type material sandwiched between two P-type layers. | PNP |
| The piece of material/crystal that's grown to make a transistor is called an ____. | ingot |
| The two end sections of a transistor are called the _____ and the _____. The center section is called the _____. | collector, emitter, base |
| Because transistors have three sections, they have two PN junctions. This is called a _____ transistor. | bipolar |
| The junction between the emitter and base is called the ________ junction (____ junction). | emitter-base, E-B |
| The junction between the base and collector is called the ________ junction (___ junction). | base-collector, B-C |
| N-type (negative) materials contain excess ____, and P-type (positive) materials contain excess ____. | electrons, holes |
| Applying the needed DC potentials to the electrodes of a transistor in order to "push" the transistor into conduction is called _____. | biasing |
| In order to get a bipolar transistor into operation, a _____ must be applied to both the base and collector. | voltage |
| Because a small change in the base current produces a large change in collector current, bipolar transistors can _____ (increase) signals. | amplify |
| Changes in base and collector current are the basic principle behind transistor amplifier operation. | no answer, just remember dis |
| In a bipolar transistor, the amount of signal amplification can be altered by controlling the amount of _______ (voltage) into the base. | electron flow |
| The control of the amount of current or voltage that enters the base is called _____. | biasing |
| The ______ voltage is the voltage applied to the base that will push the transistor into conduction. | base voltage |
| The _______ current is the current applied to the base that will determine the collector current. | base bias |
| The _____ of a transistor is the point at which the transistor starts to conduct. | bias point |
| When no voltage at all is connected to the base, the base bias is ____. | zero aka "zero base bias" |
| If you continue raising the base current, a point will be reached where the collector current levels off. This is called the _____ point. (the transistor is conducting as much as it can) | saturation |
| When too much current is delivered to a transistor, it is said to be operating in _______. This causes inefficiency in a circuit, and the transistor could be destroyed. | overdrive |
| When only a DC signal is connected to a transistor, it's said to be in the _____ mode of operation. | static |
| When only an AC signal is connected to a transistor, it's said to be in the _____ mode of operation. | dynamic |
| __________ biasing is one method used to obtain a base bias voltage in a transistor. | power supply |
| ________ biasing is the most common method of biasing used in transistor circuits. | voltage divider |
| When a transistor is voltage divider biased, there's an additional resistor that's called an _________ resistor. This resistor helps prevent thermal runaway. | emitter stabilization (aka temperature stabilization) |
| ________ is an upward spiral of increasing heat and current in a transistor. | Thermal runaway |
| ______ operation is a transistor biased so that only half of the input waveform gets reproduced. | Class-B |
| In an ___________ (___) circuit, a radio signal is delivered to an amplifier. The output of that amplifier goes to several additional amplifiers. At some point in the receiver, part of the signal gets rectified into DC voltage. This voltage is then fed back into the first amplifier and used for biasing. This circuit prevent changes in the strength of the radio input signal changing the volume of the output signal. | automatic volume control (AVC) |
| If the bias voltage is increased above the requirement for maximum, the gain decreases. This is called _____ AVC. | forward |
| If the bias voltage is decreased below the requirement for maximum, the gain is decreased. This is called _____ AVC. | reverse |
| In a _____ amplifier, the positive and negative swings of the output current are amplified equally. | linear |
| In a _____ amplifier, certain portions of the output current are more amplified than others. | nonlinear |
| _____ reactance is is reactance due to the presence of capacitance in an AC circuit. | Capacitive |
| _____ reactance is the part of the reactance of an AC circuit that's due to inductance. | Inductive |
| When both reactances and resistances are present in an AC circuit, the total opposition to the flow of AC current is called _____. | impedance |
| _____ is represented by the symbol Z and is measured in ohms. | Impedance |
| When the values of internal impedance and the external impedance are equal, and at the same time, the external reactance is equal to the internal reactance. This is a special situation called _____. | resonance |
| Resonance is also called _________. | impedance match |
| _____ impedance is the amount of impedance you would measure at the output terminals. | Output |
| _____ impedance is the amount of impedance that you would measure at the input terminals. | Input |
| The term ____ refers to an amplifier's ability to increase the amplitude of a weak signal. | gain |
| In a transistor, the _____ terminal is the third connection and is common to both the input and output terminals. | common |
| There's 3 possible configurations for an NPN amplifier circuit: _________ amplifiers, ________ amplifiers, and ________ amplifiers. | common-emitter, common-collector, common-base |
| The behavior of any amplifier depends directly on which terminal is used as the _____ connection. | common |
| The _______ amplifier is the most commonly used configuration. The input signal is delivered to the base, and the output signal is taken from the collector. | common-emitter |
| In a ________ amplifier configuration, the input signal is delivered to the base and the output signal is taken from the emitter. | common-collector (aka emitter follower) |
| In a ________ amplifier configuration, the input signal is delivered to the emitter and the output signal is taken from the collector. | common-base |
| A transistor's _____ are fixed specifications that tell you what the transistor is capable of doing. | parameters |
| A transistors current gain is indicated by two related specifications: ____ and ____. These two values can tell you how well a bipolar transistor performs as an amplifier. | alpha, beta |
| The best way to evaluate a transistor for replacement is to determine its ____ value. | beta |
| In the normal operation of bipolar transistors, about ___ percent of the charge carriers pass through the base lead and about ___ percent pass through the collector lead. | 2, 98 |
| The sum of currents at any junction must be ___. | zero |
| In a bipolar transistor, the voltage of the ____ lead is considered to be 0 V with respect to the _____ lead and the _____ lead. | emitter, base, collector |
| Bipolar transistors are usually made from doped crystals of ______ and _____. | silicon, germanium |
| The ________ is the voltage applied to the base that will push a transistor into conduction. | base bias voltage |
| Thermal runaway is prevented by connecting a resistor to the ______ lead. | emitter |
| If the base voltage on an NPN transistor becomes more positive than the collector volt age, the transistor will be _____. | destroyed |
| The opposition that a capacitor offers to the flow of AC current is called __________. | capacitive reactance |
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