Spread Spectrum Clocking Simplified

At the first look, the term spread spectrum may sound intimidating and complicated

. However, it is very simple and one of the essential components for most technologies these days. This article will simplify this term and make you understand the nuances of its working.

Spread spectrum clocking is the fundamental of electronic devices. Most devices, these days, come with a different kind of a local oscillator that generates signals of the clock. These continuous signals help other components to synchronies with each other. This oscillator may cause the tone to be transmitted like electromagnetic interference or EMI, which in turn disturbs the other devices. This signal is spread by purposely varying the frequency at which it is being sent, which is the job of spread spectrum.

This results in many advantages, which aid the electronic machines tremendously, like a wider bandwidth and the avoidance of objects or other frequencies that might interfere with the original signal. In addition to this, using this can also make the signal more secure and deter its interception.

Mainly dealing in security and interference, unlike the PCIe clock, this technique helps you stay in the same frequency. For instance, when a signal is generated it needs to stay in the same frequency range, such as a radio station. Tuning into a radio station means setting the radio to the same signal frequency; if the frequency is changed, the station is also changed. It is fine for the signal to stay in the same range in a situation like a radio station, but in some instances the signal needs to either be blocked from being intercepted or changed to avoid interference. The theory works in this manner.

Unlike real time clock, spread spectrum ensures the tone of signal is varied the other devices work continuously around the desired frequency without interference. Lets take for example a 1 GHz processor. With spread spectrum, the frequency may be wavering from around 999.5 MHz at a given point in time to 1.0005 GHz at another. What occurs is that the power of tone is spread more and over a wide band of tight frequencies near the desired tone.

Spread spectrum clocking has been in demand since years, thanks to the introduction of devices in telecommunications and communication fields. Deregulation in these devices has made this technique a must-have. It is also used in many wireless technologies and networking.

by:Integrated Device Technology

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