Oscillators Glossary

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Center Frequency
A specified reference frequency of the crystal typically denoted in megahertz (MHz) or kilohertz (kHz).

CMOS
Abbreviation for "Complementary Metal Oxide Semiconductor."

Control Voltage
Range of voltage used to pull the frequency.

Duty Cycle
Measurement of output waveform's uniformity; also referred to as symmetry. Measurement of the time in which, the output waveform is in a logic high state, expressed in percentages (%). Must be measured at a specified voltage or at a percentage of the output waveform amplitude.

ECL
Abbreviation for "Emitter Coupled Logic."

Enable/Disable Function
Control function which, enables or disables the output of the oscillator. When the oscillator is in its disabled state, the oscillator is still operating, but no output is coming from the output pin.

Enable/Disable
Time Time between application of the proper voltage to the enable/disable pin

Fall Time
Amount of time it takes the output voltage to go from Logic '1' to logic '0'.

Input Current
Amount of current consumption by an oscillator from the power supply, typically specified in milliamps (mA).

Linearity
Uniformity of the shift in frequency over voltage change, when pulling frequency of a VCXO.

Load Drive Capability (Fan Out)
Maximum load the oscillator can drive. Specified in terms of the number of gates or type of load circuit.

Load Impedance
Impedance presented by a load connected to a generator or any other source

Logic Levels
Defined as the Output Voltage Logic High or "Logic 1" and the Output Voltage Logic Low or "Logic 0"



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Oscillators Glossary
Oscillators Glossary

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