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As an example, in the area of personal computers, some BIOS writers include the ability to disable spread-spectrum clock generation as a user setting, thereby defeating the object of the EMI regulations. This might be considered a loophole, but is generally overlooked as long as spread-spectrum is enabled by default.
Frequency-hopping spread spectrum (FHSS) is a method of transmitting radio signals by rapidly changing the carrier frequency among many frequencies occupying a large spectral band. The changes are controlled by a code known to both transmitter and receiver .
Direct-sequence spread-spectrum transmissions multiply the symbol sequence being transmitted with a spreading sequence that has a higher rate than the original message rate. Usually, sequences are chosen such that the resulting spectrum is spectrally white. Knowledge of the same sequence is used to reconstruct the original data at the receiving ...
A phase-locked loop or phase lock loop (PLL) is a control system that generates an output signal whose phase is fixed relative to the phase of an input signal. Keeping the input and output phase in lockstep also implies keeping the input and output frequencies the same, thus a phase-locked loop can also track an input frequency.
Such digital devices work just as well with a clock generator that dynamically changes its frequency, such as spread-spectrum clock generation, dynamic frequency scaling, etc. Devices that use static logic do not even have a maximum clock period (or in other words, minimum clock frequency); such devices can be slowed and paused indefinitely ...
spread-spectrum clocking reduces EMI in systems that are clocked from the oscillators FSXO – Frequency Select Oscillator 20–100 ppm Those requiring frequency agility and multi-protocol serial interfaces. Clock output frequencies are changeable with hardware or serial-select inputs, reducing BOM and simplifying the supply chain
While supercommuters often live outside of major metropolitan areas in order to save money, the Gen Zer says that living in NYC helps her pursue her acting dreams while keeping her main job. Also ...
The aim of improving system spectral efficiency is to use limited radio spectrum resources and radio network infrastructure as efficiently as possible. The objective of radio-resource management is typically to maximize the system spectral efficiency under constraint that the grade of service should be above a certain level.