Chapter 3, Section 6,7,8 Flashcards
Define the term bias as it is used in an amplifier circuit.
It sets the operating point of a transistor.
How can bias applied at the base of the transistor affect the operation of the amplifier?
Affects transistor conduction and amplification.
In an amplifier what is the phase from the input to the output?
0 degrees.
What is meant by a static operation of an amplifier?
Transistor biasing without input signal.
What is considered dynamic amplifier operation?
The amplification of varying input signals.
What are the four classes of amplifier operation?
A, B, AB, and C.
What are the classes of operation being measured against?
Conduction angles.
What type of amplifier is used for impedance matching?
Transformer amplifier.
For the impedance matching amplifier, what is the gain?
1.
What is meant when a device has a negative temperature coefficient?
Resistance decreases with temperature.
What is the problem in an amplifier that develops when the transistor begins to operate at a lower resistance?
Thermal runaway.
What does the thermistor do at the base input of the transistor?
Stabilizes the base input current.
What is the purpose of installing two diodes on the bias for amplifiers?
Temperature compensation in biasing.
Which coupling will pass DC?
Capacitive coupling.
What component causes high frequency gain losses in the coupling?
Capacitors.
What is the primary purpose of an oscillator?
Generate periodic signals.
What are the two stable outputs desired of the oscillator?
Amplitude and Frequency outputs.
What component determines the output frequency?
Resonant components.
What is the gain of a buffer amplifier?
1.
What class of amplifier are frequency multipliers?
Class C amplifiers.
What is the property of a crystal that makes them useful in oscillators?
Piezoelectricity, providing stable frequencies.
What is the purpose of an electronic filter?
Selectively pass or reject certain frequencies.
What are the three circuit configurations of a filter?
Low-pass, high-pass, and band-pass.
What electrical components make up the construction of an electronic filter?
Resistors, capacitors, and inductors.
