Spread Spectrum Oscillators Manufacturer

TKD Spread Spectrum Oscillators reduce electromagnetic interference (EMI) by modulating the clock frequency across a controlled bandwidth, helping systems pass EMC compliance with fewer filters and shields. Compact packages and CMOS output keep integration simple across consumer and industrial boards.

Ranges of Spread Spectrum Oscillators

Each series applies a programmable spread percentage to lower peak radiated energy, reducing the need for ferrites, shielding cans and board re-spins. With standard packages and CMOS output, they drop into existing timing designs with minimal change.

XO-2016SF

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XO-2520SF

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XO-3225SF

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How Spread-Spectrum Oscillators Help Reduce EMI

Energy spreading

By modulating the output frequency around the nominal value, spread-spectrum oscillators distribute radiated energy over a wider band, cutting peak EMI at the fundamental and harmonics.

Compliance margin

Lowering peak emissions by 6–10 dB often removes the need for extra filtering components or shielding, simplifying the BOM and reducing system cost.

Application fit

Spread-spectrum clocking works well for USB, SATA, HDMI and processor clocks where slight frequency modulation does not affect data integrity, but may be restricted in synchronous serial links that require exact timing.

Modulation Profiles and System Compatibility in Spread-Spectrum Clocking

Modulation profiles

Triangular profiles are the most common, providing uniform energy spreading; choose the spread percentage (0.5–2%) that achieves the EMI reduction without exceeding receiver tracking limits.

Down-spread vs center-spread

Down-spread (e.g. −0.5%) keeps peak frequency below nominal for maximum margin on high-speed serial links, while center-spread balances deviation around the nominal frequency.

System compatibility

Verify that downstream PLLs, SerDes and memory controllers can track the modulation rate (typically 30–60 kHz) without bit errors or clock loss before adopting spread-spectrum clocking.

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Spread Spectrum Oscillators | TKD

Ranges of Spread Spectrum Oscillators

XO-2016SF

XO-2520SF

XO-3225SF

How Spread-Spectrum Oscillators Help Reduce EMI

Modulation Profiles and System Compatibility in Spread-Spectrum Clocking