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The study presented in this paper shows how the conduction modes of a three-phase diode rectifier affect the distribution of noise in an ac-fed three-phase motor-drive system. It is found that in all of the conduction modes, the commonly used noise separation equations will not result in a clean separation of the common-mode (CM) and the differential-mode (DM) noise. This paper shows the intricacies...
This letter presents an RF noise model for AlGaN/GaN HEMTs. The model is based on active line approach and concept of two ports linear noise theory. Short channel effects such as channel length modulation and velocity saturation are considered in the model. The noise generated from the pinch off region is taken into account as well. Some of FET noise parameters are calculated and experimentally verified.
A generally accepted noise model of a FET without gate leakage current requires the knowledge of the elements of an equivalent circuit and three temperatures: physical temperature Ta and equivalent temperatures, Tg of intrinsic gate resistance and Td of drain conductance. Experimental confirmations have been published for III-V FETs and HEMTs and also for MOSFETs. There is, however, still a disagreement...
Oscillations in power electronic circuits with fast switching semiconductors are commonly known and the corresponding parasitic elements have been investigated in multiple literature. However, this paper investigates the triggering of these electromagnetic interference (EMI)-critical oscillations. An analytical description is derived using a boost converter circuit. Based on this description an optimization...
Behavioral EMI models for the prediction of common-mode (CM) and differential-mode (DM) noise based on Thevenin equivalents were developed earlier for a dc-fed motor-drive system. It was shown that beyond the switching frequency of the drive, the CM noise model behaved like a two-port linear network and could predict changes in the input-side EMI due to any changes in the load-side parameters or vice...
This paper presents the analysis of mixed mode noise in an H-bridge PWM converter. Based on the definition of differential mode (DM) and common mode (CM) noise voltage source and noise current and the time domain voltage and current relationship, noise prediction models are proposed in frequency domain for CM, DM and mixed mode (MM) noise with the consideration of system symmetry regarding the noise...
A single-shunt current sensing technique is widely used in industrial system to reduce the cost and mounting space of current sensors in an inverter. In addition, a pulse shift control technique, which maintains the pulse duration and achieves reliable current detection, is used in a single-shunt current sensing system. In this paper, the RMS current on the DC-link capacitor with a pulse shift control...
Noise-aware Design, statistical modeling analysis and experimental verification of crystal oscillators fabricated using advanced SiGe-C BiCMOS technology are presented. The concept of Broadband stochastic equivalent circuit models extraction is introduced to properly account for variability and sensitivity of critical design parameters (e.g., Process, Power Supply, Temperature, Geometry). Engineering...
This paper proposes a novel analog circuit verification approach using causal reasoning. To verify analog circuits, the flow begins with mining the causal reasoning steps (design plan) that produced the circuit, including starting ideas, design step sequence, and their justification [1]. Then, topological structures corresponding to the starting ideas and design step sequences are verified individually...
To model the electromagnetic emissions of integrated circuits, a full chip simulation is the most accurate method. Full chip simulations are very complex, time consuming, and do not protect the intellectual property. Therefore, other models were developed that are fast, protect confidential information and have a lower complexity. In this paper, we give a state-of-the-art overview of these models.
A compact hybrid open stub EBG structure for broadband power noise suppression is proposed. With an additional lumped component on proper locations of open stub, the proposed EBG structure could offer a wider bandgap to cover the whole associated WLAN bands or an aggregated bandgap ranging from WLAN band to above 10 GHz. A 1-D equivalent circuit model is also developed with validation by full-wave...
This paper proposes an active resonant power supply noise cancelling with fast voltage drop sensor using the combination of delay-locked loop (DLL) and vernier time-to-digital converter (TDC). Also, we propose the capacitor selector circuit realizing the active insertion of capacitors in less silicon area. These components enable one clock noise detection with fine resolution. Simulation results show...
Intra-electromagnetic noise coupling paths from RF-digital to RF receiver front end can be either of air, wire conduction, Si substrate or package/board. In this paper air and wire conduction coupling paths analysis is discussed. A miniature magnetic near field probe is applied to scan over the test chip to map magnetic near field at LTE band 1(2.1 GHz range). The map is reviewed to extract those...
We report on electromagnetic noise immunity design for multilayer printed circuit boards using quasi three dimensional electromagnetic simulation, and its application to products. For evaluation of the electromagnetic simulation, a prototype multilayer printed circuit board was designed and tested. The coupling of its power circuit patterns on the same layer and the coupling of ground patterns on...
This paper presents the measurement validation of reciprocity theorem method for near-field coupling estimation. The overall problem is decomposed into two parts, the first part is called forward problem, and the second part is called the reverse problem. For forward problem, the noise source IC is modelled by physics-based dipole moment model with data obtained from a near-field scanning plane, then...
Chaotic circuits have gained increasing attention in many engineering applications. Qualitative measures such as Lyapunov Exponent (LE) are the most common methods for identifying chaotic behavior. However, the use of these measures is limited due to the short output signal length and its contamination by noise. In this paper, we propose a novel methodology for modeling and detecting chaotic vs stochastic...
Aside from the benefits it brings, 3D-IC technology inevitably exacerbates the difficulty of power delivery with volumetrically increasing power consumption. Recent work managed to “recycle” current within the 3D stack by linking the different layers' supply/ground nets into a series connection. This charge-recycled (also known as voltage-stacked, or V-S) scheme provides a scalable solution for 3D-IC's...
Random Telegraph Noise (RTN) has become dominant with transistor rapid scaling in recent years. We simulate RTN-induced frequency fluctuation of Ring Oscillators (ROs) using a circuit-level simulator to replicate measurement results from previous works. Consequently, we can predict dependences of frequency fluctuation on operating voltages, number of ROs stages, gate widths, and body biases.
A comparison among different architectures of front-end preamplifiers for SiPM detectors is useful when relevant performance in terms of timing accuracy is required in single photon detection applications. Many different solutions have been proposed in the past, which can be grouped into three main approaches: charge sensitive amplifiers, voltage-mode amplifiers and current-mode buffers. Here these...
In this paper an accurate EMI model of a 5W flyback converter based on discrete devices modeling is presented. To improve the accuracy of EMI model, passive devices, active devices, power IC and the parameters of PCB are all taken into consideration. The simulation results show that, errors of main system-level parameters can be controlled in 5% and errors at the EMI peak values can be controlled...
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