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We investigate the dependence of maximum system reach on symbol rate. We identify a suitable modeling framework and derive a closed-form formula for the optimum rate, typically 2-to-10 GBaud. Maximum reach gains are between 5% and 20%.
We present a novel digital pre-emphasis algorithm based on the mean-square-error. We numerically demonstrate a significant increase of the maximum transmittable symbol rate for 4- up to 64QAM and experimentally, a ∼ 0.7dBQ-gain for 40GBaud-16QAM.
This paper will review recent advances in linear- and Geiger mode avalanche photodiodes (APDs). The focus for linear-mode devices will be materials and structural modifications to the conventional InP/InGaAs APD that have enabled reduced excess noise and enhanced gain-bandwidth products. The discussion of Geiger mode APDs will cover the basic operation and principal performance parameters with emphasis...
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 many radar applications, including marine, automotive and MIMO, there is a need for orthogonal transmission from different radar sets to mitigate mutual interference; the same applies to the different channels in a MIMO radar. New techniques, belonging to the cyclic algorithm family, might be used to generate orthogonal signals with, in addition, low sidelobes in their autocorrelation function...
This paper puts forward a discrete-time Markov chain algorithm in predicting a pair of active or dominant speakers in an ultra-high definition multi-user video conferencing system. The applied Markov chain minimizes false dominant speaker classification due to transient noise during a video conferencing session. This algorithm also includes a set of linear weights-based assignment for both the initial...
Active noise control (ANC) for in-ear headphones is challenging due to physical tiny volume constraint. According to the best of our survey, most of the previous papers provide only simulation results rather than physically measuring results. In this paper, the detailed experience on implementation and evaluation for ANC in-ear headphone design has been presented. Measurement results show that the...
A microwave radar system is a useful tool for terrain surface measurement even in adverse weather or darkness. Most important specification of a radar system is range resolution, which is strictly determined by the frequency bandwidth of transmitted signal. However, due to the legal regulation of radio wave emission, its frequency band is strictly limited. In the case that the maximum and minimum...
In this paper, the bandwidth enhancement of planar type electromagnetic bandgap (EBG) structure using dissipative edge termination technique is investigated. Two termination schemes are presented; first with the termination elements along edges of every single EBG patches and second with termination along edges of the whole power plane. In the first case, simulations show that, both lower and upper...
In this work, the mixed-signal differentiator technique for the compensation of excess loop delay has been extended to counteract the effect of the finite GBW of the amplifiers. A RZ DAC is utilized to realize a fast compensation path from the quantizer output to the input of the last integrator. After proper tuning of the scaling coefficients, the original NTF of the modulator can be restored, which...
This paper describes a low power optical receiver for discrete photodiodes. The receiver utilizes an input stage bandwidth of only 2GHz, affording high gain with low power consumption while limiting input-referred noise. The resulting ISI is eliminated and data recovered using an IIR DFE. The IIR DFE utilizes a local feedback to relax the timing criteria of the DFE loop. The 65-nm CMOS chip consumes...
MEG Experiment Upgrade proposes a major improvement [1] of the sensitivity in the μ →eγ decay [2]. In particular the positron tracking will be performed by means of an upgrade of MEG Drift Chamber that consists in a cylindrical wire drift chamber, with the axis parallel to the muon beam, inspired to the one used in the KLOE experiment [3]. The new tracker, currently under costruction, can achieve...
A distributed antenna system (DAS) architecture is considered to be a key enabler for further Network Virtualization where different network configurations are created as needed by a centralized decision making unit that is typically integrated into the Cloud Radio Access Networks (C-RAN) which offers a potential architecture for 5G wireless communication systems. Many schemes have been proposed for...
This paper presents a 12-channel, low-power, high efficiency neural signal acquisition front-end for local field potential and action potential signals recording. The proposed neural front-end integrates low noise instrumentation amplifiers, low-power filter stages with configurable gain and cut-off frequencies, a successive approximation register (SAR) ADC, and a realtime compressed sensing processing...
Perspective method for the monitoring and on-line modulation analysis in the HF band is presented in this paper. The workplace for the on-line analysis of analog and digital modulations consists from the digital receiver IZ225 and a PC with adequate SW. The original program for the on-line modulation signal analysis was designed in the programming environment CipherCAD. The type of modulation, its...
Noise coupling and time interleaving are effective methods for expanding the bandwidth of the low-power wideband delta-sigma modulators. In this paper, a discrete-time ΔΣ modulator topology with these two technologies, combined with shifted loop delays, is proposed. Noise coupling and time interleaving between the two channels enhance the effective order of the noise shaping function. Shifting the...
We1 present an analog front end for a PAM-4 clock and data recovery circuit designed in 65nm CMOS. The front end consists of an arrangement of 8 interleaved master and slave sample-and-hold circuits, to be followed by an array of dynamic comparators. Each interleaved channel contains two wideband buffers with accurate bias and common-mode control circuitry to drive the sample-and-hold circuits. The...
Ultra wideband radar implementations for millimeter-/microwave operation are emerging in CMOS requiring high bandwidth. A distributed amplifier (DA) topology for use as low-noise amplifier (LNA) in nanometer CMOS, is explored in this paper. Important modifications like direct termination is beneficial both in area and gain linearity. A 5-stage amplifier provides a −3dB bandwidth of 36.5GHz and a S...
Conventional active noise cancellation (ANC) applications often use high-speed digital signal processors (DSPs) to cancel annoying noise, which result in an expensive cost and high-power dissipation for modern portable devices. To achieve both high-performance and low-power consumption requirements, this paper proposes a dedicated feed-forward filtered-x least mean square (FxLMS) ANC VLSI design for...
This paper presents a low-noise single-ended open-loop switched-capacitor interface circuit in 0.35μm CMOS technology for a comb structure micro-accelerometer. Using correlated double sampling, the low-frequency noise of the charge sensitive amplifier and the gain stage is suppressed, whereas the noise of the sensor charging reference voltage and the sample-and-hold circuit which follows the gain...
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