Random spread spectrum modulation

Abstract

The present invention relates to a random spread spectrum modulation. Representative implementations of devices and techniques provide a spread spectrum clocking signal. In a frequency synthesizer, a sequence of values may be generated and used to modulate a frequency of an input signal to the frequency synthesizer.

Description

technical field [0001] The present invention relates to random spread spectrum modulation. Background technique [0002] Typically, the clock signals used in the digital core are delivered by an on-chip clock generation unit or a frequency synthesizer. The clock generation unit may be a phase-locked loop (PLL) device, which may also be implemented in the form of a digital PLL. However, such clock signals can be a source of electromagnetic interference (EMI) to other parts of the system utilizing the digital core. Unwanted electromagnetic energy can propagate throughout the system, or into the external environment, and adversely affect other susceptible devices. [0003] For example, Electromagnetic Compatibility (EMC) requirements in various industries such as the automotive and consumer appliance industries place strict limits on the emission of electromagnetic radiation from electronic devices. Accordingly, spread spectrum clocks have been developed for digital cores us...

AI Technical Summary

Problems solved by technology

The digital core must be constrained to this frequency, resulting in higher power and area consumption

Therefore, low-frequency up-scaling modulation can introduce phase accumulation in time, which can cause problems in the operation of synchronous data interfaces between digital cores and other unmodulated cores

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