Oscillators Glossary
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Oscillator
A circuit that produces an alternating current of a specific frequency at its output terminals
Output Current
Represented by IOL and IOH; it is the output current at VOL and VOH.
Output Load (Fan out)
Capability of the oscillator to drive other devices. TTL devices are specified in the number of gates that can be driven; i.e., 10 TTL gates. CMOS outputs are specified in pF, i.e., 15pF or 50pF loads.
Output Voltage
Represented by VOL; it is the maximum voltage that output low will be and VOH is the minimum voltage that output high will be.
Overlap Time
Time measured at 50% Vp-p, where the two outputs of a complementary output ECL oscillator overlap.
Pin Through
Only applies to packages with leads. When the device is mounted on a PCB, the leads go through the board.
Pullability
Amount the frequency that can deviate by varying the voltage on the control pin.
Rise Time
Amount of time it takes the output voltage to go from Logic '0' to logic '1'.
Sine wave
Periodic wave which, is represented by a sine curve. The amplitude of such wave is a function of the sine of a linear quantity such as phase or time.
Square Wave
An alternating or pulsating current or voltage whose wave shape is square.
Stability
Maximum amount of frequency deviation of the oscillator; which, includes the tolerance at 25°C; drift over operating temperature range; changes in input voltage; changes in load, shock, vibration; and aging.
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