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39 Cards in this Set

  • Front
  • Back
One alternation is called a?
PULSE
time for one complete cycle is called the?
PULSE REPETITION TIME (prt)
The number of times in 1 second that the cycle repeats itself is called the?
PULSE-REPETITION FREQUENCY (prf) or PULSE-REPETITION RATE (prr).
If each alternation in
is 200 microseconds (μs)
prt will be?
prf will be?
400 microseconds
2,500 hertz (PRF=1/PRT)
length of the pulse measured in time (T0 to T1) is referred to as the?
PULSE WIDTH (pw).
The interval of time needed for the voltage to go from 0 to 100 percent (or from 100 to 0 percent) of its maximum value is called the
TRANSIENT INTERVAL
is more accurately defined as the time required for the voltage to build up from 10 percent to 90 percent of the maximum amplitude point.
Rise time
is the time required for the voltage to drop from 90
percent to 10 percent of the maximum amplitude point.
Fall time
The type of circuit most often used to generate square or rectangular waves is the?
multivibrator
A multivibrator is
basically two amplifier circuits arranged with regenerative feedback
One of the amplifiers is what while the other is what.
conducting
cutt off
What type of multivibrator does not have a stable state?
ASTABLE
What type of multvibrator has one stable state?
MONOSTABLE
What type of multivibrator has two stable states?
BISTABLE
With no external signal applied, the transistors alternately switch from cutoff to saturation at a frequency determined by the RC time constants of the coupling
circuits.
ASTABLE
A
signal must be applied to change this condition. After a period of time, determined by the internal RC
components, the circuit will return to its original condition where it remains until the next signal arrives.
MONOSTABLE
It remains in one of the stable states until a trigger is applied. It then FLIPS to the other stable condition and remains there until another trigger is applied. The multivibrator then changes back (FLOPS) to its first stable state.
BISTABLE
An astable multivibrator is also known as a?
FREE-RUNNING MULTIVIBRATOR
The astable multivibrator has
how many outputs? inputs?
two
none
astable multivibrators must have a high degree of?
frequency stability
The prt of the input triggers must be (shorter/longer) than the natural free-running prt of the astable multivibrator, or the trigger prf must be slightly (higher/lower) than the free-running prf of the circuit. This is to
make certain the triggers control the prt of the output.
shorter
higher
monostable multivibrator sometimes called a?
ONE-SHOT MULTIVIBRATOR
The monostable multivibrator actually takes this series of input triggers and converts them to?
uniform square pulses
In an astable multivibrator, which components determine the pulse repetition frequency?
RC coupling networks.
The bistable multivibrator that most technicians know is commonly known by other names?
ECCLES-JORDAN circuit
FLIP-FLOP circuit
are used in switching-circuit applications (computer logic operations) as counters, shift
registers, clock pulse generators, and in memory circuits.
Flip-flops
In a bistable multivibrator, how many trigger pulses are needed to produce one complete cycle in the output?
Two
If a voltage (positive or negative) is measured on the "1" output of a flip-flop, what state is it in?
SET state
is a special type of wave generator used to produce a narrow pulse, or trigger.
BLOCKING OSCILLATOR
In a blocking oscillator the pulse width (pw), pulse repetition time (prt), and pulse repetition rate
(prr) are all controlled by?
the size of certain capacitors and resistors and by the operating characteristics of the transformer.
gives the most rapid transient response without overshoot.
CRITICAL DAMPING
gives rapid transient response with overshoot caused by high or infinite resistance
UNDERDAMPING
What component in a blocking oscillator controls pulse width?
Transformer
For an RC circuit to produce a linear output across the capacitor, the voltage across the capacitor may not exceed what percent of the applied voltage?
Ten percent
Increasing gate length in a sawtooth generator does what to linearity?
Decreases linearity.
In a sawtooth generator, why is the transistor turned on for a longer time than the discharge time of the RC network?
To allow the capacitor time to discharge
What is added to a sawtooth generator to produce a trapezoidal wave?
A resistor.
has a linear change in voltage and a fast
recovery time. The linear change in voltage is generated by taking the output from a capacitor. The
sawtooth voltage waveform is used to provide electrostatic deflection in oscilloscopes.
SAWTOOTH GENERATOR voltage waveform
is used to provide, a linear increase in current through a coil. A trapezoidal wave begins with a step or jump voltage, then a sawtooth wave. A trapezoidal wave of voltage is used in electromagnetic deflection display devices.
TRAPEZOIDAL GENERATOR voltage waveform