NPL has developed a Kalman-filter-based clock algorithm for combining measurements from its three active hydrogen masers. The algorithm is designed to produce a near optimal composite when the dominant noise process present is flicker frequency modulation (FFM). The FFM is modelled approximately by a linear combination of Markov noise processes. Each Markov process is included in the Kalman fil...

Vibration sensors are needed in a variety of applications, such as geophysical sensing, machinery vibration and failure prediction, tracking of vehicles, underwater pressure gradient detection, microphones, and in robotic applications. Low noise electronics is critical for creating a highsensitivity vibration sensor, especially in low proof mass MEMS designs. We have designed, fabricated, and t...

The mere presence of spatiotemporal distortions in digital videos does not have to imply quality degradation since distortion visibility can be strongly reduced by the perceptual phenomenon of visual masking. Flicker is a particularly annoying occurrence, which can arise from a variety of distortion processes. Yet flicker can also be suppressed by masking. We propose a perceptual flicker visibi...

This paper presents a new time domain Zener diode compact model for transient noise simulation. SPICE2 and SPIC3 use piece-wise linear dependent sources generating complex waveforms. approach is not practical when applied to randomly generated noise. Today, through on-going improvements freely available circuit simulation tools, SPICE generation has moved level. Ngspice, example, computes white...

Noises in the GPS vertical coordinate time series, mainly including white and flicker noise, have been proven to impair accuracy reliability of products. Various methods were adopted weaken noises such as complementary ensemble empirical mode decomposition (CEEMD), wavelet denoising (WD), variational (VMD). However, a single method only works at limited frequency band corresponding ability is i...

This article presents a wide-band suppression technique of flicker phase noise (PN) by means gate–drain shift in transformer-based complementary oscillator. We identify that after naturally canceling its second-harmonic voltage the operation itself, third-harmonic current entering capacitive path is now main cause asymmetry rising and falling edges, leading to <inline-formula xmlns:mml="http://...