A new range of spread spectrum technology (SST) oscillators that can provide a low-cost means of reducing EMI radiation in electronic systems and are manufactured as drop-in replacements for standard clock oscillators are available from Euroquartz. The company's EQ-HM series oscillators provide EMI suppression of between 10 and 16 dB at source, and range from 8,0 MHz to 165 MHz.
Electronic devices must comply with electromagnetic radiation emission standards. Traditional EMI reduction techniques include the use of shielding, filtering, de-coupling, ground planes and ferrite beads. However, the current trend towards higher carrier frequencies, narrower bandwidth and lower operating voltages makes these traditional methods less effective and increasingly expensive. The present trend is to control EMI at its source, the system clock oscillator.
As system timing signals are usually synchronised to a reference clock oscillator, from the perspective of efficiency, an EMI suppressed reference signal at the clock oscillator stage eliminates the need for traditional EMI suppression measures. Spread Spectrum Technology (SST) serves this purpose, being a technique first used in World War II for RF jamming and anti-jamming tactics. By modulating the peak energy over a wide frequency bandwidth with a low frequency carrier, the amplitude of the fundamental frequency and its associated harmonics can be reduced by several dB, leaving the total amount of energy in the system remaining.
Using clock oscillators with SST technology has no detrimental impact on the system performance (for example CPU clock rate) as the modulation rate is very slow relative to the clock output frequency, making the SST technology transparent to the system. With the integration of SST, loop filter components and matched impedance layout, the Euroquartz EQ-HM series oscillators provide a highly cost-effective solution to many EMI problems.
As an example, the EQ-HM57 oscillator series is a 3,3 V supply part offering CMOS output logic and is housed in a standard 7 x 5 mm SMD package. Pin 1 options include modulation on/off, tri-state for all outputs and power down. Ageing is ±5 ppm/year maximum while jitter for all models is 250 ps typical.
For more information contact Kevin Murphy, Arrow Altech Distribution, 011 923 9600, [email protected].
Clearing the Static: The importance of ESD audits Actum
Circuit & System Protection
An ESD audit is the first step in establishing an effective static control programme in the workplace, and will help identify vulnerable areas and potentially hazardous static zones that require improvement.
Read more...Compact 6 A automotive buck converter Altron Arrow
Power Electronics / Power Management
Delivering up to 6 A of continuous output current, the DCP0606Y from STMicroelectronics enables efficient regulation of low-voltage rails commonly used in modern vehicle electronics and industrial systems.
Read more...Next-gen modules for rugged edge AI systems Altron Arrow
Computer/Embedded Technology
Designed for real-world edge deployments where systems do not sit still, SolidRun’s P100 COMx6 series targets mobile platforms as well as harsh, mission-critical environments.
Read more...NXP has expanded its MCX A Series Altron Arrow
AI & ML
NXP has significantly expanded its MCX A Series of Arm Cortex-M33 microcontrollers, doubling the portfolio with six new families aimed at industrial and IoT edge applications.
Read more...EMI shielding materials application guide
Circuit & System Protection
TE Connectivity’s shielding solutions include electrically conductive elastomers, gaskets, knitted wire mesh, oriented wire, EMI shielding ventilation panels, shielded window, cable shielding and shielding components.
Read more...Exploring Bluetooth Channel Sounding Altron Arrow
Telecoms, Datacoms, Wireless, IoT
NXP has enabled BCS on the MCX W72 multi-protocol wireless MCU, which supports Bluetooth Low Energy 6.0, Thread, Zigbee, and Matter.
Read more...Dual-band Wi-Fi 6 companion module Altron Arrow
Telecoms, Datacoms, Wireless, IoT
The SimpleLink Wi-Fi CC33xx family of devices from Texas Instruments are dual-band Wi-Fi 6 companion modules enabling engineers to connect more applications with confidence.
Read more...High-performance linear regulator Altron Arrow
Power Electronics / Power Management
The TI TPS7A57-Q1 is an automotive-grade, high-performance low-dropout linear regulator, engineered for precision power delivery in noise-sensitive systems.
While every effort has been made to ensure the accuracy of the information contained herein, the publisher and its agents cannot be held responsible for any errors contained, or any loss incurred as a result. Articles published do not necessarily reflect the views of the publishers. The editor reserves the right to alter or cut copy. Articles submitted are deemed to have been cleared for publication. Advertisements and company contact details are published as provided by the advertiser. Technews Publishing (Pty) Ltd cannot be held responsible for the accuracy or veracity of supplied material.
printer friendly version