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Christian Enz

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Related publications (213)

Approximate FPGA Implementation of CORDIC for Tactile Data Processing using Speculative Adders

In most robotic and biomedical applications, the interest for real-time embedded systems with tactile ability has been growing. For example in prosthetics, a dedicated portable system is needed for developing wearable devices. The main challenges for such ...

2017

A 420 mu W, 4 GHz Approximate Zero IF FM-UWB Receiver for Short-Range Communications

Christian Enz, Vladimir Kopta

A low-power FM-UWB receiver intended for short range communications in wireless sensor networks is presented in this paper. It utilizes an "approximate zero IF" architecture which combines a free-running ring oscillator as the RF LO with a modified delay-l ...

Ieee2016

Experiment and Investigation of Two Types of Vibrotactile Devices

Christian Enz, Jörn Justiz, Huaiqi Huang, Tao Li

Tactile displays have a wide range of applications in assistive technology, prosthetics, and rehabilitation. Vibrotactile stimulation shows potential to be integrated into wearable devices because of its small size, low power consumption, and relative fast ...

Ieee2016

Avalanche Microwave Noise Sources in Commercial 90-nm CMOS Technology

Christian Enz, Pierre-André Farine, Cyril Botteron, Gabriele Tasselli

This paper presents a microwave noise source implemented in a commercial CMOS technology. The circuit is based on the avalanche noise generated by both the source-to-bulk and the drain-to-bulk junctions in reverse breakdown. Two sources of different juncti ...

Institute of Electrical and Electronics Engineers2016

A 51.4 Mb/s FSK Transmitter Employing a Phase Domain Digital Synthesizer with 1.5 mu s Start-up for Energy Efficient Duty Cycling

Christian Enz, Nicola Scolari, David Ruffieux, Raghavasimhan Thirunarayanan

This paper presents a low start-up latency Transmitter (TX) that can achieve FSK data rates of upto 51.4 Mb/s for deployment in duty cycled microsensor nodes. Utilizing a Phase Domain Digital Synthesizer with an FBAR frequency reference, this TX has a star ...

Ieee2016

Design of ultra low-power RF oscillators based on the inversion coefficient methodology using BSIM6 model

Christian Enz, Anurag Mangla, Maria-Anna Chalkiadaki, Gabrielle Guitton

This paper presents a fast and accurate way to design and optimize LC oscillators using the inversion coefficient (IC). This methodology consists of four steps: linear analysis, nonlinear analysis, phase noise analysis, and optimization using a figure of m ...

2016

Sub-electron CIS noise analysis in 65 nm process

Christian Enz, Assim Boukhayma, Raffaele Capoccia

For a 4T pixel-based CMOS image sensors (CIS) readout chain, with column-level amplification and CDS, we show that the input-referred total noise in a standard 65 nm process can be reduced to 0.37 e-rms. Based on transient noise simulation using Eldo, the ...

2016

A Sub-0.5 Electron Read Noise VGA Image Sensor in a Standard CMOS Process

Christian Enz, Assim Boukhayma, Arnaud Peizerat

A sub-0.5e−rms temporal read noise VGA (640H×480V) CMOS image sensor has been integrated in a standard 0.18μm 4PM CMOS process. The low noise performance is achieved exclusively through circuit optimization without any process refinements. The presented im ...

Ieee-Inst Electrical Electronics Engineers Inc2016

Design of Energy-Efficient Discrete Cosine Transform using Pruned Arithmetic Circuits

Christian Enz, Vincent Frédéric Camus, Jérémy Lucien Maurice Schlachter

Inexact circuits and approximate computing have been gaining a lot of interest in order to improve performances and energy efficiency beyond the boundaries of conventional digital circuits. Image and video processing is one of the best candidate for applyi ...

IEEE2016

A Low-power Carry Cut-Back Approximate Adder with Fixed-point Implementation and Floating-point Precision

Christian Enz, Vincent Frédéric Camus, Jérémy Lucien Maurice Schlachter

This paper introduces an approximate adder architecture based on a digital quasi-feedback technique called Carry Cut-Back in which high-significance stages can cut the carry propagation chain at lower-significance positions. This lightweight approach preve ...

Ieee2016

GigaRad total ionizing dose and post-irradiation effects on 28 nm bulk MOSFETs

Christian Enz, Claudio Bruschini, Federico Faccio, Farzan Jazaeri, Chunmin Zhang, Alessandro Pezzotta

The DC performance of both n- and pMOSFETs fabricated in a commercial-grade 28 nm bulk CMOS process has been studied up to 1 Grad of total ionizing dose and at post-irradiation annealing. The aim is to assess the potential use of such an advanced CMOS tech ...

IEEE2016

Approximate 32-Bit Floating-Point Unit Design with 53% Power-Area Product Reduction

Christian Enz, Vincent Frédéric Camus, Jérémy Lucien Maurice Schlachter

The floating-point unit is one of the most common building block in any computing system and is used for a huge number of applications. By combining two state-of-the-art techniques of imprecise hardware, namely Gate-Level Pruning and Inexact Speculative Ad ...

Ieee2016

A Low-Noise CMOS THz Imager Based on Source Modulation and an In-Pixel High-Q Passive Switched-Capacitor N-Path Filter

Christian Enz, Assim Boukhayma

This paper presents the first low noise complementary metal oxide semiconductor (CMOS) terahertz (THz) imager based on source modulation and in-pixel high-Q filtering. The 31 × 31 focal plane array has been fully integrated in a 0 . 13 μ m standard CMOS pr ...

Mdpi Ag2016

EMG Pattern Recognition Using Decomposition Techniques for Constructing Multiclass Classifiers

Christian Enz, Claudio Bruschini, Jörn Justiz, Huaiqi Huang, Tao Li

To improve the dexterity of multi-functional myoelectric prosthetic hand, more accurate hand gesture recognition based on surface electromyographic (sEMG) signal is needed. This paper evaluates two types of time-domain EMG features, one independent feature ...

IEEE2016

Impact of GigaRad Ionizing Dose on 28 nm bulk MOSFETs for future HL-LHC

Christian Enz, Claudio Bruschini, Federico Faccio, Farzan Jazaeri, Chunmin Zhang, Alessandro Pezzotta

The Large Hadron Collider (LHC) running at CERN will soon be upgraded to increase its luminosity giving rise to radiations reaching the level of GigaRad Total Ionizing Dose (TID). This paper investigates the impact of such high radiation on transistors fab ...

IEEE2016

Nanoscale MOSFET Modeling for the Design of Low-power Analog and RF Circuits

Christian Enz, Alessandro Pezzotta

This paper presents the simplified charge-based EKV MOSFET model and shows that it can be used for advanced CMOS processes despite its very few parameters. The concept of inversion coefficient is then presented as an essential design parameter that spans t ...

IEEE2016

Design methodology for low power RF LNA based on the figure of merit and the inversion coefficient

Christian Enz

The complexity of radiofrequency circuit design comes from the large number of parameters to be adjusted. Constant node shrink in CMOS process and variation of technology skills significantly contribute to this complexity. The paper reports on a reliable a ...

Springer2016

Noise Reduction Techniques and Scaling Effects towards Photon Counting CMOS Image Sensors

Christian Enz, Assim Boukhayma

This paper presents an overview of the read noise in CMOS image sensors (CISs) based on four-transistors (4T) pixels, column-level amplification and correlated multiple sampling. Starting from the input-referred noise analytical formula, process level opti ...

Mdpi Ag2016

Temporal Readout Noise Analysis and Reduction Techniques for Low-Light CMOS Image Sensors

Christian Enz, Assim Boukhayma, Arnaud Peizerat

In this paper, an analytical noise calculation is presented to derive the impact of process and design parameters on 1/f and thermal noise for a low-noise CMOS image sensor (CIS) readout chain. It is shown that dramatic noise reduction is obtained by using ...

Institute of Electrical and Electronics Engineers2016

RF Small-Signal and Noise Modeling Including Parameter Extraction of Nanoscale MOSFET From Weak to Strong Inversion

Christian Enz, Maria-Anna Chalkiadaki

The downscaling of CMOS processes has led to devices with an impressive RF performance. Advanced nanoscale RF MOSFETs present very high transit frequency, which can be traded off with lower power consumption, by shifting the operating point towards the wea ...

Institute of Electrical and Electronics Engineers2015

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