# Overview

This site uses the word oscillator to represent a component with an self-contained oscillating feature that has power, ground, and signal out pins. This site uses the word crystal to represent an component which contains a oscillating element (in the form of a crystal), which requires an external oscillation circuit before it useful.

# Designators

A common designator prefix to use for oscillators is $$Y$$ (e.g. $$Y1$$). I do not recommend using the prefix $$XC$$ as this should be reserved for crystal oscillators.

# Important Parameters

## Phase Noise

Phase noise is a way of describing the stability of the crystal in the frequency domain.

## Start-Up Time

Symbol: $$T_{SU}$$

The start-up time for most oscillators is within the range 2-20ms. This start-up time can be important in low-power designs when the start/stop time of the crystal results in wasted energy.

# Physical Construction

The smaller SMD oscillators use MEMs technology in order to fit the entire device into small component packages.

Posted: December 17th, 2015 at 1:21 pm
Last Updated on: December 17th, 2015 at 4:55 pm