scholarly journals A Regulated Pulse Current Driver with Spread Spectrum Clock Generator †

Electronics ◽  
2021 ◽  
Vol 10 (21) ◽  
pp. 2661
Author(s):  
Ming-Shian Lin
Keyword(s):  
Spread Spectrum ◽  
Electromagnetic Interference ◽  
Peak Power ◽  
Pulse Current ◽  
Power Level ◽  
Consumer Electronics ◽  
Voltage Controlled Oscillator ◽  
Clock Generator ◽  
Electronic Components ◽  
Triangular Wave

This paper presents a regulated pulse current driver with a spread spectrum clock generator (SSCG) to lower the electromagnetic interference (EMI) effect. An SSCG is used and implemented by applying a triangular wave to modulate a voltage-controlled oscillator (VCO). The results show a 7 dBm reduction in the peak power level with a frequency deviation of 10%, demonstrating that the dominate harmonic is spread and distributed to adjacent frequencies, and the magnitude of harmonics is significantly reduced. The results demonstrate that the driver with a spread spectrum clock generator would help to reduce interference in sensitive electronic components and be suitable for portable consumer electronics applications.

scholarly journals Design of double ring lock ring in extensible frequency clock generator chip

2021 ◽  
Vol 2137 (1) ◽  
pp. 012041
Author(s):  
Chao Xu ◽  
Yumeng Xie ◽  
Yuan Zhou
Keyword(s):  
Spread Spectrum ◽  
Electromagnetic Interference ◽  
Phase Locked Loop ◽  
Center Frequency ◽  
Good Effect ◽  
Clock Generator ◽  
Clock Frequency ◽  
Noise Interference ◽  
Main Loop ◽  
Secondary Loop

Abstract With the continuous development of computer technology and the continuous improvement of interface data rate, the clock frequency has reached the demand of several gigahertz, which makes the electromagnetic interference problem very serious. Spread spectrum clock is an effective method to reduce electromagnetic interference of digital chips. Therefore, this paper designs a double-loop phase-locked loop that can spread spectrum and has strong anti-electromagnetic noise interference ability. The designed dual-loop phase-locked loop can be used in the clock generator chip. The overall structure of the circuit consists of a main loop and a secondary loop. The main loop is an adjustable phase-locked loop circuit that can provide an output with a center frequency of 500MHz. The secondary loop can realize the spread spectrum function by charging and discharging the filter capacitor of the main loop loop, and at the same time, the spreading depth can be set by the feedback based on the frequency division. The dual-loop phase-locked loop designed in this paper has a good effect in spread spectrum and anti-electromagnetic interference noise.

scholarly journals An Experimental Study of Conducted EMI Mitigation on the LED Driver using Spread Spectrum Technique

2016 ◽  
Vol 62 (3) ◽  
pp. 293-299 ◽  
Author(s):  
Mohammad Yanuar H ◽  
Risanuri Hidayat ◽  
Eka Firmansyah
Keyword(s):  
Spread Spectrum ◽  
Electromagnetic Interference ◽  
Power Level ◽  
Luminance Level ◽  
Switching Frequency ◽  
Led Driver ◽  
Design Component ◽  
Component Design ◽  
Current Change ◽  
Conducted Emi

Abstract LED driver has the potential to interfere the system of electronic devices if the voltage and current change rapidly. Several previous studies presented various solutions to overcome this problem such as particular converter design, component design, electromagnetic interference (EMI) filters, and spread-spectrum techniques. Compared to other solutions, the spread-spectrum technique is the most potential way to reduce the EMI in LED applications due to its limited cost-size-weight. In this paper, the effectiveness of conducted EMI suppression performance and the evaluation of its effect on LED luminance using spread-spectrum techniques are investigated. Spread-spectrum is applied to the system by modifying the switching frequency by providing disturbances at pin IADJ. The disorder is given in the form of four signals, namely square, filtered-square, triangular, and sine disturbance signals. The highest level of the EMI suppression of about 31.89% is achieved when the LED driver is given 800 mVpp filtered-square waveform. The highest reduction power level occurs at fundamental frequency reference, when it is given 700 mVpp square disruption signal, is about 81.77% reduction. The LED luminance level will reduce by 85.2% when it is given the four waveforms disruption signals. These reductions occur as the switching frequency of the LED driver does not work on a fixed frequency, but it varies in certain bands. LED brightness level has a tendency to generate a constant value of 235 lux when it is given the disruption signals. This disturbance signal causes the dimming function on the system that does not work properly.

A 3.5 GHz Spread-Spectrum Clock Generator With a Memoryless Newton-Raphson Modulation Profile

2012 ◽  
Vol 47 (5) ◽  
pp. 1199-1208 ◽  
Author(s):  
Sewook Hwang ◽  
Minyoung Song ◽  
Young-Ho Kwak ◽  
Inhwa Jung ◽  
Chulwoo Kim
Keyword(s):  
Spread Spectrum ◽  
Clock Generator ◽  
Newton Raphson
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