The LTC®6908 is an easy-to-use precision oscillator that provides 2-outputs, shifted by either 180° or 90°. The oscillator frequency is programmed by a single external resistor (RSET) and spread spectrum frequency modula-tion (SSFM) can be activated for improved electromag-netic compatibility (EMC) performance.
Spread spectrum clocking (SSC) is a special way to reduce the radiated emissions of digital clock signals. SSC is the variation of the frequency of a clock signal in a controlled way.
Using Spread Spectrum Oscillators to Reduce Radiated Emissions …
May 29, 2003 · The DS1086 is an EconOscillator designed to induce dither in the oscillator output, reducing radiated emissions in systems from printers to gaming consoles. The device consists of a programmable 66MHz to 133MHz clock-frequency generator tunable in 10kHz increments through a 2-wire interface.
Easy-to-Use Spread Spectrum Clock Generator Reduces EMI and More - Analog
Feb 1, 2024 · With the MOD ping rounded, spread spectrum operation is disabled and the LTC6902 serves as a multi-phase clock generator. The value of R SET and the selection of the master oscillator divide factor and the number of clock phases determine the …
A 340 nA/MHz Low Power FLL-based RC Oscillator with - IEEE …
A PRBS (Pseudo-random binary sequence) generator driven by output frequency/4 is used in the VCO to perturb the VCO control which in turn modulates the frequency for the spread spectrum. The proposed oscillator has a trimmed accuracy of 1.5 % across automotive PVT, using 7 …
Apr 21, 2020 · Optimize with spread spectrum for 9kHz RBW in the <30MHz frequency band. With spread spectrum for <30MHz, one saves the most with reduced filter and shielding requirements. Test PSU with a fixed frequency setting. Parts with a FREQ setting resistor can be easily made spread spectrum.
Current Spread Spectrum Clock Oscillator with Adjustable …
This paper presents a Spread spectrum clock oscillator for the DC-DC converter. In this design, digital logic control is added based on the RC relaxation oscill.
Spread Spectrum is a controlled and careful modulation of the clock signal in a way that does not contribute significantly to jitter. It has been successfully shown that by using Spread Spectrum, radiation has been lowered from 7 to 20dB depending on the degree of modulation.
Optimize with spread spectrum for 9kHz RBW in the <30MHz frequency band. Spread spectrum optimized for <30MHz, saves the most by reduced filter and shielding requirements. Test PSU first with a fixed frequency setting. Parts with an external FREQ setting resistor can be easily made spread spectrum.
RC oscillators, including relaxation oscillators, were developed to realize on-chip oscillators with a standard CMOS process [2]. The oscillator used in the analog circuit can be divided into...