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Q: What are the Factors affecting the frequency stability of an oscillator?
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Factors that affect frequency stability and amplitude stability of oscillator?

Practically, there are some factors that affect the frequency stability of Variation in temperature Oscillator • Circuit Components - Values of R, L and C changes with temperature • Transistor Parameters - causes variation in transistor parameters • Supply Voltages - Variations in power supply • Stray Capacitances • Output Load - Variations of load causes a change in effective resistance • Inter‐element Capacitance


Why you use crystal oscillator in 8085 microprocessor?

The oscillator provides the basic clock of a microcontroller to be able to execute the instructions in a stable, periodic way. It is often used for other peripherals too, like timer, UART, etc. as frequency base, usually divided by a clock divider for integer factors, or by PLL for rational factors. If the timing accuracy of these functions is not important, a simple RC oscillator can be used. Many microcontrollers have it internally. Accuracy is in 1...10% range. For better accuracy and temperature stability, a resonator can be used. For applications where timing is critical, a crystal can be used. Most micros have built-in oscillator, so only a crystal and two caps are needed. For those which have no built-in oscillator, external crystal oscillator module may be used. There are OCXO and TCXO modules available for very high stability needs.


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Related questions

Factors that affect frequency stability and amplitude stability of oscillator?

Practically, there are some factors that affect the frequency stability of Variation in temperature Oscillator • Circuit Components - Values of R, L and C changes with temperature • Transistor Parameters - causes variation in transistor parameters • Supply Voltages - Variations in power supply • Stray Capacitances • Output Load - Variations of load causes a change in effective resistance • Inter‐element Capacitance


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Why you use crystal oscillator in 8085 microprocessor?

The oscillator provides the basic clock of a microcontroller to be able to execute the instructions in a stable, periodic way. It is often used for other peripherals too, like timer, UART, etc. as frequency base, usually divided by a clock divider for integer factors, or by PLL for rational factors. If the timing accuracy of these functions is not important, a simple RC oscillator can be used. Many microcontrollers have it internally. Accuracy is in 1...10% range. For better accuracy and temperature stability, a resonator can be used. For applications where timing is critical, a crystal can be used. Most micros have built-in oscillator, so only a crystal and two caps are needed. For those which have no built-in oscillator, external crystal oscillator module may be used. There are OCXO and TCXO modules available for very high stability needs.


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