AMPLITUDE STABILITYAmplitude stability refers to the ability of the oscillator to maintain a
constant amplitude in the output waveform.
ASTABLE MULTIVIBRATORA multivibrator which has no stable state. Also called free-running
because it alternates between two different output voltage levels during the time it is on. The
frequency is determined by the RC time constant of the coupling circuit.
ATTENUATIONThe ability of a filter circuit to reduce the amplitude of unwanted frequencies to a
level below that of the desired output frequency.
BANDPASS FILTERA filter which allows a narrow band of frequencies to pass through the circuit.
Rejects or attenuates frequencies which are either higher or lower than the desired band of
BAND-REJECT FILTERRejects the passage of current for a small band of frequencies. Allows
current to flow at frequencies either above or below this band.
BANDWIDTHThe range of frequencies included between upper and lower frequencies.
BISTABLE MULTIVIBRATORA multivibrator that has two stable states. It remains in one of the
states until a trigger is applied. It then flips to the other stable state and remains there until another
trigger is applied. Also referred to as a flip-flop.
BUFFER AMPLIFIERAn amplifier which isolates one circuit from another. It decreases the loading
effect on an oscillator by reducing the interaction between the load and the oscillator.
CAPACITIVE REACTANCEThe opposition, expressed in ohms, offered to the flow of an
alternating current by capacitance. The symbol for capacitive reactance is Xc.
CLAMPERA circuit in which either the upper or lower extremity of a waveform is fixed at a desired
COMPLEX WAVEA waveform other than a sine wave.
COUNTERA circuit which counts input pulses.
CRYSTAL OVENClosed oven maintained at a constant temperature in which a crystal and its holder
are enclosed to reduce frequency drift.
DAMPED WAVEA sinusoidal wave in which the amplitude steadily decreases with time. Often
associated with energy loss.
FILTER CIRCUITNetwork of resistors, inductors, and/or capacitors which offers opposition to
FLYWHEEL EFFECTThe ability of a resonant circuit to operate continuously because of stored
energy or energy pulses.