Spectrum Diversity Clocking Introduction In order to purposely vary the optimal position of the clock edge such that the resulting signal’s spectrum is “spread,” around the ideal frequency of the clock, this is known as spread spectrum clocking. This benefits timing circuits by decreasing electro-magnetic interference.
A system’s electromagnetic interference (EMI) is reduced through spread-spectrum technology. By dispersing the clock energy over a wide frequency range, this technique operates.
In order to reduce energy peaks at particular frequencies, the spread-spectrum clocking feature evenly distributes the energy of the fundamental clock frequency across your design. Your design is more likely to comply with EMI emission compliance criteria thanks to the feature’s reduction of the spectrum peak amplitudes, which also lowers the expense of traditional EMI containment.
The Global spread-spectrum clock market accounted for $XX Billion in 2021 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2024 to 2030.
Renesas provides a diverse range of flexible spread spectrum clock generator (SSCG) solutions made up of a patented combination of analogue and digital phase-locked loop (PLL) technology.
Products supporting crystal or clock reference inputs are available in the Renesas spread spectrum clock generator range. Renesas’ high-performance PLL technology maintains good phase noise and great performance while lowering EMI for systems that need wide spectrum clock injection on clock reference inputs.
Customers may maintain high performance while cutting costs and design time on pricey shielding, chokes, and ferrite beads by utilizing Renesas’ spread spectrum clock technology.
Spread spectrum clocking uses a modest modulation of the clock frequency to reduce the peak energy produced by a clock. Spread spectrum clocking reduces the EMI produced by the clock at both its fundamental frequency and its following harmonics, hence lowering the overall EMI of the system.
Both down spread and center spread spectrum clocking are supported by spread spectrum clock generator (SSCG) products. While center spread spectrum clocking modulates uniformly both above and below the nominal clock frequency, down spread spectrum clocking modulates below the nominal clock frequency.
The requirements of the clock destination determine the kind of spread spectrum clocking that is utilized. There may be a maximum clock frequency specification for certain destination chipsets, CPUs, etc. that cannot be exceeded. Down spread spectrum clocking ought to be used in these circumstances.
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