Showing papers on "Noise (electronics) published in 2022"
TL;DR: To effectively reduce the magnetic noise, the effect of structure parameters on the longitudinal and transverse magnetic noise is analyzed, and the optimized parameters are obtained and show that the longitudinal magnetic noise decreases with the increasing aspect ratio and stabilize eventually.
Abstract: Magnetic field shields are important for electronic equipment, ultrahigh-sensitivity sensors, and electrical instruments. For ultrahigh-sensitivity atomic sensors, in particular, ferrite shields with low intrinsic magnetic noise are widely used. In this article, the calculation methods of longitudinal and transverse magnetic noise, which are calculated by loss, are analyzed. The experimental results confirm the feasibility of the model. Using the loss separation method, it is proved that the loss of ferrite magnetic shielding is mainly hysteresis loss, which is below 100 Hz. To effectively reduce the magnetic noise, we analyze the effect of structure parameters on the longitudinal and transverse magnetic noise, and the optimized parameters are obtained. The results show that the longitudinal magnetic noise decreases with the increasing aspect ratio and stabilize eventually. When the aspect ratio exceeds 1, the transverse magnetic noise remains practically unchanged. When the external diameter is fixed, by optimizing the thickness of the magnetic shield, the optimal solution for the longitudinal and transverse magnetic noise is obtained.
35 citations
TL;DR: An adaptive sigmoidal function (S-function) model is first proposed in this article to estimate the voltage distortion, and an accurate compensation scheme is proposed to reduce the current distortion and torque ripple.
Abstract: The output voltage distortion of the inverter worsens the performance of the permanent-magnet synchronous motor, therefore, it should be compensated accurately. The inverter output voltage can be measured by the oversampling system, but the measured voltage contains drift and noise. To solve this problem, an adaptive sigmoidal function (S-function) model is first proposed in this article to estimate the voltage distortion. A nonlinear Levenberg–Marquardt regression method with voltage oversampling measurement is employed to identify the initial parameters of the adaptive S-function. During the operation, a recursive least square method is exploited to refresh the parameters of the S-function in realtime. The voltage distortion is accurately obtained by the proposed method, and an accurate compensation scheme is proposed to reduce the current distortion and torque ripple. The effectiveness of the proposed method is validated by experiments.
8 citations
TL;DR: In this paper, the performance of the MM-VCSEL with a 7.5-μm oxide-confined aperture and a root-mean-square spectral linewidth of 1.nm was analyzed for intra-data-center application.
Abstract: Chirp-dispersion and data transmission analyses of the multimode vertical-cavity surface-emitting laser (MM-VCSEL) with a 7.5-μm oxide-confined aperture and a root-mean-square spectral linewidth of 1 nm is performed for intra-data-center application. For directly modulating the non-return-to-zero on-off keying (NRZ-OOK) and the 4-level pulse amplitude modulation (PAM-4) data streams, an optimized bias current of 17 mA and a data amplitude of 800 mV are selected to provide the MM-VCSEL with an output optical power of 6.1 mW and a transverse mode number of 17. Such an optimized operation enables the MM-VCSEL with a differential resistance of 45.3 Ω to approach the impedance matching by driving the circuit such that the −3-dB bandwidth can be achieved to 23.8 GHz. The relative intensity noise and mode-partition-noise of the MM-VCSEL are analyzed to perform the optimized NRZ-OOK/PAM4 data encoding. By utilizing the pre-emphasis technique to compensate for the intensity and phase variation, the encoded NRZ-OOK and PAM-4 can be respectively promoted to 61 Gbit/s and 96 Gbit/s in the back-to-back (BtB) case. After passing through the 100-m OM5 multi-mode-fiber (MMF) link to suffer the severe modal dispersion, the data rate would respectively degrade to 45 Gbit/s (or 4.5 Gbit·km/s) and 70 Gbit/s (or 7 Gbit·km/s) for OOK and PAM-4 transmission.
7 citations
TL;DR: In this article, the authors explored the injection parameter space of an optically injected semiconductor laser, and the associated probability density functions (PDFs) were numerically investigated for generation of chaotic waveforms with rogue waves (RWs) or Gaussian distributions.
Abstract: The statistical properties of semiconductor laser chaos are of great importance for practical applications. By exploring the injection parameter space of an optically injected semiconductor laser, the associated probability density functions (PDFs) are numerically investigated for generation of chaotic waveforms with rogue waves (RWs) or Gaussian distributions. First, generation of RWs are demonstrated by considering chaotic waveforms with long-tailed PDFs. The dynamical behaviors for RW generations are systematically investigated by exploring the entire injection parameter space, where a pattern is identified for parameter regions of nonzero RWs. The occurrence of RWs is also investigated for different injection parameters by evaluating the effects of laser bias current, spontaneous emission noise, and detection bandwidth. Alternatively, Gaussian PDFs are generated by bandwidth-limited detection of chaotic waveforms. The bandwidth-dependent statistical properties are investigated through tuning the injection parameters for different detection bandwidths. Generation of Gaussian PDFs are demonstrated for a large region of injection parameters and for a detection bandwidth as comparable to the laser relaxation resonance frequency. This numerical study reveals the importance of injection parameters for tuning the statistics associated with chaotic lasers, and confirms the feasibility of generating RWs and Gaussian PDFs on demand for potential applications in various fields.
5 citations
TL;DR: In this paper, the authors proposed a least square fast transverse filtering (LS-FTF) self-adaptive denoising algorithm to improve the robustness, stability, and noise immunity performance of the sensor.
4 citations
TL;DR: Results reveal that the randomness factor extremely affects the probability of occurrence of each solution, justifying the application of such analyses in reliability-related studies and situations where sensitivity to randomness is acute.
4 citations
TL;DR: In this paper, a global calibration factor is used to minimize the effect of loudspeaker nonuniformity in mode generation, and the mode generation process of the calibrated system is mainly divided into two steps.
3 citations
TL;DR: In this article, the authors proposed a high frequency crosstalk noise sensor based on a differential amplifier input stage combined with CMOS inverters as analog amplifiers in a Cherry-Hooper topology.
Abstract: A substrate crosstalk sensor featuring high performance gain over a wide frequency range is proposed. The topology is used as high frequency crosstalk noise sensor in modern mobile communication SoC applications. The design is based on a differential amplifier input stage combined with CMOS inverters as analog amplifiers in a Cherry-Hooper topology. The sensor performance is demonstrated via simulation results in an RFCMOS 65 nm process with a gain of 5.7 dB in a frequency range from 24 MHz up to 15 GHz, and –1 dB compression point of 107 mV, appearing as the most advanced and high performance noise sensor in the literature.
1 citations
TL;DR: The quadrature decomposition combined with geometric complex representation are used to approach the spectral modeling of the influence of wide-sense stationary additive noise on IAS spectral estimate using the periodogram and a statistical approach is proposed in order to set thresholds on Ias spectral observation allowing a good separation of additive random perturbations from real information under a certain probability.
1 citations
TL;DR: In this article, a dual-channel displacement-sensing system is proposed and demonstrated based on the SMI effect and intracavity spectroscopy, and the displacement-reconstruction error is 110nm when the frequency is 30 Hz and the peak-to-peak amplitude is 4 μ m.
1 citations
TL;DR: In this paper, the authors explored the time-dependent quantum adiabatic switching (TDQAS) of impurity doped quantum dot (QD) under the aegis of Gaussian white noise (GWN).
Abstract: Current inquiry explores the time-dependent quantum adiabatic switching (TDQAS) of impurity doped quantum dot (QD) under the aegis of Gaussian white noise (GWN). The QAS has been performed among the impurity-modulated states of QD using several switching functions (SFs). The time-evolution of switching has been monitored with the help of overlap function and quantum information entropy (QIE). The SFs appear to recover the impurity-modulated eigenstates of QD corresponding to the final Hamiltonian starting from the analogous QD eigenstates corresponding to the initial Hamiltonian. The switching paths have been found to be comprising of important physical attributes of overlap function and QIE. These subtleties of the switching paths and the efficiency of switching/recovery depend on the nature of the SF itself and the characteristics of noise. The study deems importance since impurities have become inalienable part of QD systems for immense technological applications where presence of noise could invite additional delicacies.
TL;DR: In this article, the effects of non-Hermiticity on quantum coherence via a noisy quantum kicked rotor (NQKR) were studied, where the random noise comes from the fluctuations in kick amplitude at each time.
Abstract: We study the effects of non-Hermiticity on quantum coherence via a noisy quantum kicked rotor (NQKR). The random noise comes from the fluctuations in kick amplitude at each time. The non-Hermitian driving indicates the imaginary kicking potential, representing the environment-induced atom gain and loss. In the absence of gain and loss, the random noise destroys quantum coherence manifesting dynamical localization, which leads to classical diffusion. Interestingly, in the presence of non-Hermitian kicking potential, the occurrence of dynamical localization is highly sensitive to the gain and loss, manifesting the restoration of quantum coherence. Using the inverse participation ratio arguments, we numerically obtain a phase diagram of the classical diffusion and dynamical localization on the parameter plane of noise amplitude and non-Hermitian driving strength. With the help of analysis on the corresponding quasieigenstates, we achieve insight into dynamical localization, and uncover that the origin of the localization is interference between multiple quasi-eigenstates of the quantum kicked rotor. We further propose an experimental scheme to realize the NQKR in a dissipative cold atomic gas, which paves the way for future experimental investigation of an NQKR and its anomalous non-Hermitian properties.
TL;DR: In this paper, a time-domain model of terahertz signals is derived by taking multiple reflected pulses into consideration, using the Differential Evolution algorithm to calibrate parameters automatically.
TL;DR: In this article, the dynamical behavior of the one-dimensional FitzHugh-Nagumo (FN) neural model under the co-excitation of cross-correlation multiplicative non-Gaussian noise and additive colored noise is investigated.
Abstract: The dynamical behavior of the one-dimensional FitzHugh–Nagumo (FN) neural model under the co-excitation of cross-correlation multiplicative non-Gaussian noise and additive colored noise are investigated in this paper. Firstly, the one-dimensional Langevin equation of the FN model can be obtained by using the adiabatic elimination method. Then, the approximate Fokker–Planck equation (AFPE) is derived with functional methods, and the expressions of steady-state probability density function (PDF) and the mean first-passage time (MFPT) are obtained. Finally, the effects of different parameters on PDF and MFPT are discussed as a reflection of the properties of the FN neural model. Moreover, under certain conditions, noise enhanced stability (NES) effects can be induced by noise.
TL;DR: In this article, it was shown that probing a mechanical oscillator with a dichromatic field with frequencies separated by the oscillator frequency enables independent detection in two outputs and complete subtraction of the measurement noise associated with the quantum back action.
TL;DR: In this paper, a 3 sigma monitor with a novel detector circuitry that employs a feedback loop that works without an external reference and it is hardened against temperature and process variations was designed in the 40nm CMOS technology node, operating at 1.1 V.
01 Jan 2022
TL;DR: In this article, an optical XOR gate based on Terahertz Optical Asymmetric Demultiplexer (TOAD) using Quantum Dot Semiconductor Optical Amplifier (QDSOA) is presented.
Abstract: All Optical XOR gate based on Terahertz Optical Asymmetric Demultiplexer (TOAD) using Quantum Dot Semiconductor Optical Amplifier (QDSOA) is the subject matter of this chapter. The operating speed of the proposed gate is 1 Tb/s. QDSOA is a versatile gain medium and has advantages in terms of gain recovery, patterning effect, amplified spontaneous emission (ASE) noise, etc. The XOR gate is simulated using MATLAB and analyzed by calculating Extinction ratio (ER), Contrast ratio (CR), and quality factor (Q). The bit error rate (BER) is also calculated to show proper operation of the logic for optical communication applications. The XOR gate is characterized by pseudo eye diagram also. Relative eye opening of more than 90% is calculated shows clear transmission of the bits.