unit two
the class A amplifiers conducts for ________ of the input cycle
100%
the class C amplifier is biased to allow current to flow for less than ___degrees of input cycle
180
what is the phase relationship of the output signal to the input signal voltage in a common emitter amplifier?
180 degree
the class B amplifier conducts for_____ of the input cycle
180 degrees
the two junctions of a BJT are _____
N-type and P-type
BJTs are classified as either PNP or _____ based on the arrangement of ______
NPN, N and P type materials
what is the definition of amplifications?
ability of a circuit to take a small change in input and produce a large change in output voltage or current
a transistor is a solid state device that can _____ signals. they can also be used as a/an _____switch.
amplify small electrical, electronic
when the output sine wave is chopped off at the top and bottom is an example
amplitude distortion, overdriven
in the common collector configuration, the input is applied to the _____ and the output is taken from the_____
base, emitter
in a common emitter configuration, the input is applied to the _______ and the output is taken from the_____
base,collector
what does amplification depend on in a transistor?
depends on the change in transistors resistance caused by an input signal
the arrow on a transistor schematic symbol identifies the ____ element
emitter
the common base amplifier has the input applied to the _____ and the output taken from the____
emitter, collector
the two main categories of transistors are bipolar junction transistors and ____ transistors.
field-effect
an amplifiers class of operation is determined by the amount of _____ bias
forward, bias
for normal operation of a transistor, the emitter-base junction is ______ biased and the collector-based junction is ______biased
forward, reversed
which of the three elements determines how much current will flow between the source and the drain?
gate
in the common base amplifier, the voltage gain is ______ than one, but the current gain is _____ than one.
greater, less
what three steps do you take in order to identify an amplifier's configuration?
identify the element to which the input signal is applied. identify the element from which the output signal is taken, the remaining element is the common element
what is the phase relationship between the input and output voltage waveforms of the three amplifier configuration?
in phase, 180 out of phase
which FET is the simplest in construction?
junction field effect
BJTs have a_____ temperature coefficient
negative
where is bias applied to a transistor and what affect does it have on a transistor?
on the base, causes current to flow through and around the transistor circuitry
what function does the gate of a FET perform?
permits current to flow through or blocks their passage by creating or eliminating a channel between source and drain
what is the purpose of the common emitter amplifier?
provide good current and voltage amplification and power
gain is the ______ of the output signal to the input signal and represents what?
ratio of change, represents number of times a signal is amplified
the two outermost operating points of the transistor are called _____ and ____
saturation and cutoff
what are the three elements of a field effect transistor (FET)?
source gate and drain
what is the important thing to remember about the amount of voltage applied to a transistor?
the amount of voltage applied to the base cause current to either increase or decrease both in the transistor and in circuitry around the transistor
what is considered the fourth terminal in a FET and what does it do?
the body
define the static condition of a transistor circuit.
the circuit does not have an input signal and is fixed in a non-varying condition
an advantage of a class D amplifier is that it produces less heat than an analog amplifier.
true
what are some advantages of FETs over bipolar junction transistor?
very durable , very small, high resistance to physical shock, and are very inexpensive
