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This work proposes a stabilization and noise suppression method for the angle velocity sensor integrated readout circuit using additional adaptive feedback. This feedback circuit senses corner frequency of the input signal and adjusts readout bandwidth and output noise in accordance with this corner frequency. Model of sensor and readout circuit was developed in order to estimate dynamic and noise...
We propose a digital modulation scheme, based on the generalization of the chirp signal, that allows to improve the performance of Global Navigation Satellite System receivers in scenarios affected by channel additive white Gaussian noise, narrowband interference and multipath. Different signaling schemes, characterized by autocorrelation functions with small secondary peaks, can be obtained by adjusting...
Measuring distance in short-range radio devices greatly enhances the user experience. The distance information gives the user the opportunity to make intelligent decisions to which device in range he may want to connect. Previous efforts using radio signal strength or ultra-wideband technologies have not shown to be successful. In this paper, a narrowband RF technique is presented that is based on...
A possible approach to address spectrum congestion is to develop signaling schemes that allow for spectrum sharing with minimum system interference. In this paper, we consider the problem of co-existence between radar and communications systems by designing a common signaling scheme to jointly optimize the performance of both systems. In particular, we derive constraints on the parameters of linear...
This paper presents the robust characterization of nonlinear microwave devices driven by broadband modulated multi-sine stimuli by using a refined multi-tone waveform measurement system. The substantial contribution comes from the capability of the measurement system to measure and average the time domain waveforms of adjacently modulated signals on a similar time scale for different modulation frequencies...
Passive coherent location (PCL) systems can employ a variety of terrestrial broadcast signals for target detection and ranging. Through analysis of the ambiguity function, one can determine a signal's suitability for this application. The main parameters of concern are amplitude, range resolution, Doppler resolution and sidelobe ratios. This paper presents an analysis of several recorded signals in...
In the delivery of end-to-end services, Network Functions (NFs) are frequently utilized. Traditionally, these NFs are implemented on middle-boxes. Since physical middle-boxes are hardware-based, expensive and hard to maintain and upgrade, they are replaced by Virtual Network Functions (VNFs) following the trend of Network Function Virtualization (NFV). Nowadays services are implemented by the ordered...
Resonant segmented Mach-Zehnder modulators which enable DAC functionalities without the use of dedicated components are here presented. The modulators are shown to broaden the bandwidth of an EO transmitter. Error-free modulation of a 56 GBd OOK signal is demonstrated employing electronics with 22 GHz bandwidth only. The modulators are also used to shape the spectrum of an optical signal for Nyquist-space...
This paper creatively presents a sigma-delta digital to analog converter (ΣΔDAC) which achieves 88.5 dB signal to noise and distortion ratio (SNDR) in the 200 KHz bandwidth. The proposed modulator with a high pass dither block can eliminate harmonic spurs without increasing the noise floor in band. In addition, a 2nd-order vector feedback dynamic element match (VFBDEM) provides a good harmonic suppression...
In this paper, the process of generating a signal frequency modulated continuous wave (FMCW) using direct digital synthesizer (DDS) will be presented starting from the design process simulation using the software on the computer until the realization and measurement of the generation of such signals on a module DDS, the kits from Analog Devices. Generation conducted a baseband signal with a bandwidth...
The work addresses classification of EEG signals into seizure and non-seizure by applying EMD and SVM with proposal of new feature Root Mean Square (RMS) frequency and feature using Hilbert marginal spectrum which overcomes the drawback of feature instantaneous bandwidth. We have success in achieving the consistency with the new features which shows classification average accuracy of 97.72% and highest...
We introduce a new concept for broadband invisibility, enabling the first experimental demonstration of phase-preserving cloaking, undetectable by coherent spectral and temporal measurements. The concept is demonstrated by concealing a filter in a fiber-optics system.
This paper presents a low power, low-g and low noise accelerometer. By using chopper topology, an integrated low pass filter and zero and hold (ZOH) low pass filter, the low noise and low power are achieved. The integrated low-pass filter eliminates the chopping ripple voltage caused by the demodulation. The ZOH low pass filter provides a nulling function at chopping frequency to notch the residual...
In this paper, a 1.8-V 3-bit quadruple-sampling delta-sigma modulator for audio application is presented. To performance high-resolution and low-cost modulator, a single opamp is used to complete the integration with four phases. Since the phase difference between any two succeeding clocks is 90 degrees, the sampling rate will be four times of clock frequency. The effective integration time can also...
In this paper an optimization process to obtain the optimal code rate, SNR and modulation order for energy efficient underwater communications is presented. It was seen that it is possible to further decrease the consumption when compared to the binary case considering code rate optimization in conjunction with the selection of the optimum modulation order, while achieving higher data transmission...
Although there are various researches for the sonar processing gain of replica correlation under noise dominant environments, it seems no reports have been published for the reverberation limited region researches. In this paper a theoretical approach under reverberation dominant environments is presented using a reverberation modeling with large frequency modulation LFM transmissions. The result...
Slow rate, in-band signalling embedded into audio content of digital or analog radio broadcast network is common but demanding design challenge. In this paper a solution based on complementary pair of notch-peak filters for audio in-band signalling system is proposed. The concept is illustrated with a series of examples, verifying the basics of the idea and indicating possible traps and challenges...
The sense path design for new MEMS applications requires up to 20-Bit dynamic range in small low-frequency bandwidth removing the offset and 1/f noise. In this paper a new sense chain design, aimed to reach 19-Bit dynamic range in 150Hz bandwidth has been presented implementing a new full-chopper system using chopped integrators. The proposed sense path has been successfully inserted into a new gyroscope...
A noise-efficient readout interface designed in a 150nm standard CMOS technology for a FET based THz radiation detector is presented. The interface is able to detect μV-range rectified signal from the FET detector, amplifying it by 70 dB gain. A multistage switched-capacitor (SC) readout channel employing chopper modulation is exploited so as to remove 1/ƒ noise and obtain repeatable gain and frequency...
In this study a new frequency hopping scheme which relies on digital up-conversion of baseband data is proposed. Since the frequency of the local oscillator is kept constant and hopping is achieved in the baseband, the time required for the frequency jump is independent of the frequency step, allowing a narrow loop bandwidth and low noise performance for conventional phase locked loops (PLLs). Moreover...
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