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Power supply noise generated by integrated circuits is one of the major sources of EM radiation from PCBs. The reduction of power supply noise can be realized by means of devices that bypass the current among power supply planes, such as bypass capacitors, ground vias and so on. In a previous work the effect of current bypass devices on the far field radiation from multilayer PCBs was very efficiently...
This paper presents a methodology for assessing the impact of critical components in a PWM VSI servo drive on conducted electro-magnetic interference. Conducted emissions at the ac mains input are caused in part by the coupling and leakage of high frequency common-mode currents through complex return paths in the drive system. Common-mode currents are caused by switching of IGBTs at high slew rates...
An investigation of simultaneous switching noise (SSN) and electromagnetic compatibility (EMC) issues in a physical model of a system in package (SiP) is presented in this paper. SSN simulation is conducted in time domain with an extracted package model which contains package components, drivers and terminal resistors. In addition, electromagnetic interference (EMI) from the SiP is observed from far...
Switching power converters are sources of noise for sensitive circuits. Converters should comply with electromagnetic compatibility (EMC) rules so that the electromagnetic interference (EMI) caused by switching cannot interfere with the normal operation of adjacent circuits and also the converter itself. The produced interference can be in the form of conduction or radiation. In this paper, some techniques...
EMC design of electronic equipment is the key point to determine whether their systems work or not. This paper analyzes the distinction between the differential mode interference and the common mode interference, and emphasize the common mode interference is the main PCB interference. It mainly introduces the characteristics of ΔI noise, how to solve the EMC problems using decoupling capacitors from...
The charge pump belongs to the most critical blocks for electromagnetic compatibility (EMC) of low dropout linear regulators (LDO) because of its switching nature. The goal of this paper is to contribute charge pump design practice and a prediction method for the LDO EMC performance already in an early design phase. LDO noise coupling mechanisms are analyzed. EMC aware circuit design includes the...
Power noise of an integrated circuit (IC) chip is dominantly characterized by the frequency-domain impedance of a chip-package-board integrated power delivery network (PDN) and the operating frequency of circuits. A 65 nm CMOS chip embedding a high precision on-chip waveform capture clearly exhibits the relation of AC power noise components with the parallel resonance seen from on-chip digital circuits...
The EMI generated by SMPS is an important topic for research because international EMC regulations have become stricter. Many papers have been published in this area. This paper is an effort to briefly review the categorization of various modes of noise generated by SMPS with fly-back converter topology. The effect of Mixed Mode noise is similar to Differential Mode noise but its sources are same...
In this paper, the optimized matching circuit between RF SAW (surface acoustic wave) filter output and RF LNA (low noise amplifier) input on the limited PCB (Print Circuit Board) placement space has been gotten by simulation. With the matching circuit, the conducted sensitivity of receiver of the GSM mobile phone is about -109 dBm. Such good sensitivity can decrease desense (sensitivity degradation)...
The effects of a novel embedded capacitance material on PI-Power integrity, SI-Signal integrity and EMC-Electro Magnetic Compatibility were simulated and measured by comparing a multilayer board with embedded capacitance to a conventional multilayer board utilizing conventional FR-4 material. SIwave software was used to simulate electrical properties and EMC of the embedded capacitance material board...
In order to pass GB 9254 Class A, a convenient method is proposed to analyze and suppress the radiated electromagnetic interference (EMI) generated by radio frequency identification (RFID) based-systems. Near-field wave impedance is employed to identify the mechanism of it. Then, several shunt capacitors are utilized to reduce the radiated EMI noises due to its fixed structure and intentional radiators...
Functional tests of field programmable analog arrays (FPAA) are required to assess tolerance to uncontrolled and unintentional variations in the components characteristic parameters, like for example a change in the values of capacitances and gains of the differential amplifiers which may be due to aging, uncertainty (i.e., a difference between the actual and nominal values), or to an outer disturbance...
The converter is an EMI emissions source to the grid and loaders. Moreover, it is interfered by the elements of itself. Therefore, particular attention should be paid to EMI for converter design. Based on a 55 kW two-level converter prototype, the analysis of a switching power supply which is an important EMI emissions source in converter is performed. Furthermore, the DC bus bar can also produce...
Synchronous buck converters generate broadband noise typically in 50-300 MHz range. In this paper, the root cause of this broadband noise and possible coupling mechanisms are analysed. Then, a list of EMC design guideline for minimizing the broadband noise is presented. The guideline contains circuit level guideline which involves input filtering, component selection, and an effective snubber strategy...
Many companies and small universities do not have the financial means to purchase very expensive software or hardware resources that can be used to effectively teach EMC related design principles to engineers or students. However, most of these universities and companies do have access to cost-effective SPICE software tools, such as MultiSimreg, as well as other math related software packages such...
Models of integrated circuits (ICs) allow printed circuit board (PCB) developers to predict radiated and conducted emissions early in board development and allow IC manufactures insight into how to build their ICs better for electromagnetic compatibility (EMC). A model of the power delivery network, similar to the ICEM or LECCS model, was developed for a microcontroller running a typical program and...
A collection of slides from the authorpsilas seminar presentation is given. P/GBN is one of the key issues for designing high-speed digital circuit with good signal integrity (SI) and EMC performance. Several approaches to eliminate the P/GBN on the power delivery systems are investigated by both numerical simulations and experimental measurement.
A new on-chip transient detection circuit for system-level electrostatic discharge (ESD) protection is proposed. The circuit performance of detecting fast electrical transients has been verified in a 0.18-mum CMOS integrated circuit (IC). The experimental results have confirmed that the proposed on-chip transient detection circuit can detect positive and negative fast electrical transients during...
This paper demonstrates the magnetic near field coupling between two ports at a computer board. Based on a failed radiated emission measurement result the coupling is found by evaluation with a probe and a spectrum analyzer and different electronic modifications like filtering and cable routing. The electromagnetic filed mitigation at a parallel port with integrated capacitors is based on the maximum...
There is a revolution in modern digital ICs &PCB designs and their usage triggers the need for better understanding of PCB design [ apart from digital circuit design ] in detail. Design of digital circuits need special cares with respect to EMC and hence the associated mounting of components besides PCB design layout. These aspects are addressed in this paper with Check list in the form of detailed...
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