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In the course of years, several models have been put forward to explain noise phenomena, bias temperature instability (BTI), and gate leakage currents amongst other reliability issues. Mostly, these models have been developed independently and without considering that they may be caused by the same physical phenomenon. However, new experimental techniques have emerged, which are capable of studying...
Standard ultrasound modes, as implemented in commercial equipment, require to transmit high voltage (HV) burst signals, whose amplitude may be up to 150Vpp. HV power supplies typically use switching circuits that may generate undesired electromagnetic interferences. Further challenging requirements on the power supply circuits are imposed by the novel experimental methods that may entail programmable...
This paper describes a top-down approach to design a Sigma-Delta based modulator for analog to digital conversion. The primary focus is on designing an ADC for audio application, thus, the conversion is done on a 22.05 kHz bandwidth with a 16-bit resolution (CD quality). The behavioural code of the modulator is created first to check the signal ranges on internal nodes. Next, the circuit non-idealities,...
Electromagnetic interference is one of the critical problems to the safety and stability of HVDC systems. When the ±800 kV converter station changes the operating states, the breaker and switcher operations will cause sharp voltage and current transient in the primary circuit and interference into the secondary system. The characteristics of switching EMI under different system operation statuses...
A scaling-friendly, hybrid, two-stage ΔΣ ADC with a 5-bit SAR as first stage and a VCO as second stage is presented in this work. Since the VCO can provide fine quantization for small signals in the time-domain, it is used to directly quantize the SAR residue without OTA-based residue amplification. Also, having a small input swing obviates the need for VCO non-linearity calibration. The VCO phase...
It is traditionally difficult to implement higher order PWM closed loop class-D audio amplifiers using analog techniques. This paper describes a mixed signal approach, implementing a 4th order amplifier in 55nm CMOS with minimal demands on a front-end ADC. An approach to design the feedback loop in the digital domain with high gain throughout the audio band (100dB at DC) to improve linearity and PSRR...
Controller area networks (CANs) are primarilyused for communications among electronic devices in anautomobile. The noise resistance mechanism defined by theCAN standard accommodates frame/bits errors caused byrelatively small noise. However, when it comes to the modern electronic vehicles (EVs) and hybrid vehicles (HVs), the noiselevel caused by high voltage switching in DC-DC converterscould be very...
The vestibulo-ocular reflex (VOR) plays an important role in our daily activities by enabling us to fixate on objects during head movements. Modeling and identification of the VOR improves our insight into the system behavior and helps in diagnosing various disorders. However, the switching nature of eye movements, including the VOR, makes the dynamic analysis challenging. In this work we are using...
This paper investigates and evaluates coupled inductors in interleaved multiphase three-level DC-DC converters. If non-coupled inductor is used and maintaining the inductance of inductor, multiphase three-level DC-DC converter interleaving operation will increase the inductor current ripple, although the overall output current ripple and common mode voltage will be smaller. To reduce the inductor...
This paper describes IMPREAL 2.0, a system developed in LabVIEW which automates the acquisition of voltage impulse waveforms from digital oscilloscopes and implements the mathematical procedures described in the new standards IEC 60060/2010. The system controls Tektronix oscilloscopes and is able to automatically calculate the time and amplitude parameters of lightning impulses, switching impulses,...
The hybrid system approach is used to minimize losses in the AMB system by switching controllers and bias current. The method is validated with experimental results at steady state and rotating system. With high bias orbits of the rotor are reduced while in the absence of disturbance the losses are minimized with low bias. The switching rules based on inner variables of the control system are proposed.
An approach towards a high speed current mode SAR ADC is presented. Even though SAR ADCs based on charge redistribution have been significantly improved in efficiency and operating frequency, they are still limited by the settling requirements of the switched capacitor DAC. To overcome this limitation, we propose the use of a current mode SAR ADC incorporating a current steering DAC operating at 2...
A basic model for excess current noise in amplifiers with switched input is presented. Thermal noise in the input switches causes charge fluctuations in the amplifier input capacitance with a bandwidth much higher than the switching frequency. This wideband charge noise is undersampled by the switching process, leading to excess current noise with a spectral density proportional to temperature, capacitance...
As data rate of serial interface has increased dramatically, timing margin has gotten tighter and tighter. Supply voltage has also kept deducing according to silicon process technology. However, supply noise is hardly reduced due to higher data rate, a huge number of transistors and slower improvement of packaging technology. Therefore, the jitter due to supply noise can be quite large compared to...
On-chip voltage regulator module (VRM) for the reduction of power/ground noise on power distribution network (PDN) and jitter minimization at high-speed output buffer is introduced. The basic topology and optimized operation for on-chip VRM is analyzed. A PDN with on-chip VRM shows reduced power/ground noise through removing additional effects coming from package/PCB PDN. Also, when on-chip VRM is...
The output characteristic of a photovoltaic array is nonlinear and changes with solar irradiation and cell's temperature. The Maximum Power Point Tracking (MPPT) technique is needed to maximize the produced energy. Most MPPT techniques contain the time derivative of the current and the voltage. These electric signals are disturbed by the high frequency noises such as the switching noises of the power...
Decoupling for power rails that demand large current, such as FPGA core, is difficult. The capacitors required for derived solution requires excessive board area for placement and raise system cost significantly. Switcher with high loop Band Width helps reducing the decoupling needs with all the design improvements. In this paper, we proposed a 3-stage behavioral model for switcher to help PCB designer...
In a server system, the switching voltage regulator (VR) noise coupled to the IO pins of the adjacent memory riser connector through the open air above the base board, and the link performance was impacted by the coupling. A simulation flow was developed to reproduce this EMI phenomenon. The flow first used electromagnetic field solvers to extract the VR related power network and the VR-IO coupling...
Noise caused by switching voltage regulator (VR noise) can have a big impact on system signal / power performance, leading to signal integrity (SI) / power integrity (PI) issues. This paper introduces systematic ways of reducing VR noise as well as VR noise analysis methods. And a real design case with VR noise issue is shared with simulation and measurement results.
Motivated by the growing desire for low power design as well as the stochastic behavior of electronic circuits, the probabilistic computing based on inherently stochastic devices has been proposed. The single-electron (SE) technology is a promising candidate for implementing probabilistic switches due to its intrinsic mechanism and nanoscale feature size. In this paper, we analyze the stochastic behavior...
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