Carlos Sánchez-Azqueta

Gigabit Receiver Over 1 mm SI-POF For Home Area Networks

A novel receiver front-end is proposed for short-range optical communications over low-cost polymer optical fiber and, in particular, for home area networks. This paper focuses on the experimental verification of the IC prototype POFchip-II, implemented in a standard 0.18-

A Low-Power CMOS Receiver for 1.25 Gb/s Over 1- mm SI-POF Links

\mu

1-V continuous-time equalizers for multi-gigabit short-haul optical fiber communications

m CMOS technology plus a commercial Si-PIN photodetector and a 1 mm step-index plastic optical fiber (POF) transmission channel. A 1.25 Gb/s data transmission rate is attained for POF lengths ranging from 10 to 50 m thanks to a continuous-time adaptive equalizer included in the receiver chain that compensates the limited and length-dependent speed of POF. The measured sensitivity of the receiver leads to an eye-safety approach up to almost 30 m reach.

A 1-V 1.25-Gbps CMOS analog front-end for short reach optical links

This paper presents an optical receiver for short-reach applications through low-cost plastic optical fiber. The limited bandwidth caused by the fiber and the external photodiode is compensated by a new adaptive equalizer based on the spectrum balancing technique. A clock and data recovery circuit is included that minimizes jitter and metastability using a new multilevel bang-bang architecture. The prototype, implemented in a standard 0.18-μm CMOS process, achieves 1.25 Gb/s with a power of 107 mW at only 1 V.

CMOS transimpedance amplifier with controllable gain for RF overlay

Two new CMOS analog continuous-time equalizers for high-speed short-haul optical fiber communications are presented in this paper. The proposed structures compensate the limited bandwidth-length product of 1-mm step-index polymer optical fiber channels (45 MHz, 100 m) and have been designed in a standard 0.18-µm CMOS process. The equalizers are aimed for multi-gigabit short-range applications, targeting up to 2 Gb/s through a 50-m step-index polymer optical fiber. The prototypes operate with a single supply voltage of only 1 V and overcome the severe limitations suffered by the widely used degenerated differential pair caused by the low supply voltage. Copyright

A 1.7-GHz wide-band CMOS LC-VCO with 7-Bit coarse control

This paper presents a new adaptive equalizer for short reach applications through low-cost plastic optical fiber. The adaptive equalizer uses the spectrum balancing technique to compensate the limited bandwidth caused by the fiber and the external photodiode. The prototype has been implemented in a standard 0.18-μm CMOS process fed at 1 V. It consumes 38.6 mW at 1.25 Gb/s.

A 2.5-Gb/s multi-rate continuous-time adaptive equalizer for short reach optical links

In this paper, a fully-differential transimpedance amplifier (TIA) with controllable transimpedance for use in RF overlay downstream communication systems is presented. It consists of a shunt-shunt feedback transimpedance amplifier with transimpedance and open loop gain control. The transimpedance amplifier is intended for 47 MHz to 870 MHz subcarrier multiplexed RF signals with a 18 dBΩ transimpedance gain control range. The TIA, designed in a CMOS 180 nm technology, dissipates 27 mW from a supply voltage of 1.8 V. The input-referred noise current is lower than 6 pA/√Hz to allow an optical input power from -6 to +2 dBm.

Nanoscale constrictions in superconducting coplanar waveguide resonators

This paper presents an LC-tank-based voltage-controlled oscillator, fabricated in a standard 0.18 μm CMOS technology, with a 44 % tuning range around a center frequency of 1.7 GHz. To minimize the impact of the proposed oscillator on phase noise in phase-locked-loops, it has a coarse control of 27-1 levels, driven by a 7-bit digital word, achieving a tuning sensitivity below 35 MHz/V along the whole tuning range. The oscillator has -123.4 dBc/Hz phase noise at 1 MHz offset and draws 10 mA from a 1.8 V supply, yielding a total power/tuning/frequency-normalized figure of merit equal to -5.5 dB.

Application of a MEMS-Based TRNG in a Chaotic Stream Cipher

This paper presents a new multi-rate continuous-time adaptive equalizer for short-haul gigabit optical communications. It is designed to compensate the attenuation of a 50-m 1-mm core step-index plastic optical fiber (SI-POF) for input data ranges from 400 Mb/s up to 2.5 Gb/s. It includes three adaptation loops to compensate the possible variations in level and spectrum of the input signal. The prototype has been implemented in a cost-effective 0.18-μm CMOS process. The system is fed with only 1 V and has a total power consumption of 60 mW.

Continuous-Time Linear Equalizer for Multigigabit Transmission Through SI-POF in Factory Area Networks

We report on the design, fabrication, and characterization of superconducting coplanar waveguide resonators with nanoscopic constrictions. By reducing the size of the center line down to 50 nm, the radio frequency currents are concentrated and the magnetic field in its vicinity is increased. The device characteristics are only slightly modified by the constrictions, with changes in resonance frequency lower than 1% and internal quality factors of the same order of magnitude as the original ones. These devices could enable the achievement of higher couplings to small magnetic samples or even to single molecular spins and have applications in circuit quantum electrodynamics, quantum computing, and electron paramagnetic resonance.