Alejandro Israel Bautista Castillo

National Institute of Astrophysics, Optics and Electronics | INAOE · Electronics Coordination

This work introduces the iSensMEX-POT platform, a potentiostat-based detection system for conducting cyclic voltammetry measurements. It consists of a mixed-mode application-specific integrated circuit (ASIC) and a user digital interface unit based on Raspberry/Python platform. The ASIC consists of three main building blocks: a potentiostat built b...

Recently Python has become relevant for many tasks in a variety of disciplines leading to the development of various open source libraries. Our contribution to that cluster of tools is 𝐸2SCAPy, a useful program for the symbolic computation of analog circuits. The most appealing feature of 𝐸2SCAPy lies in its ability to solve large circuits with sev...

This study rigorously investigates the effectiveness of nonlinear filters in CMOS for 2-D signal processing to enhance image quality. We comprehensively compare traditional linear filters’ performance, which operate on the principle of linearity, with nonlinear filters, such as the median-median (Med-Med) approach, designed to handle nonlinear data...

Abstract: Silicon Photomultipliers (SiPM) are currently an excellent option to replace the traditional photomultiplier tubes (PMT) due to the fact that they require much lower operational voltages than the PMTs with photon detection efficiencies (PDE) higher than 40% at peak wavelengths (in the blue-green visible part of the spectra), do not requir...

A design strategy for the synthesis of high-selectivity/low-order analog filters in Complementary Metal-Oxide-Semiconductor (CMOS) technology for very high frequency (VHF) applications is presented. The methodology for the reconstitution of a given transfer function by means of Signal Flow Graphs (SFG) manipulation in canonical form is proposed lea...

First performance evaluation of MexSiC - a readout ASIC for analog SiPM based Cherenkov Detectors

The design of a power upconverter with low power consumption in a six metal layers, 180nm CMOS technology from UMC foundry is presented. The proposed circuit is highly linear, exhibiting an IIP3 of 13.55dBm, a conversion factor of-5.6dB, a consumption of 45.48µW and a 3GHz bandwidth ranging from 3GHz to 6GHz. These features make the proposal suitab...

Designing a new Data Acquisition Circuit for SiPM-based Detection Systems - MexSiC

The design of a very compact four quadrant CMOS analog multiplier is presented. The circuit has a very simple design, consisting of only four transistors and ten resistors, enabling a very small silicon area consumption. Furthermore, the multiplier can work in both subthreshold and saturation region, allowing it to operate over a wide range of freq...

This work presents the modeling details of a power upconverter enabled to process base band signals from a ΣΔ modulator. The modulated sequence is encoded for Ultra Wide Band (UWB) transmission using the RF blockset in Mat-lab/Simulink. The system complies with the indoor emission mask for UWB and presents a simple design consisting only of a ΣΔ mo...

The present chapter is about the synthesis and design of a passive mixer in CMOS technology with output power managment, which satisfies the demands established by Bluetooth and Ultra Wideband (UWB). The simulation in Mentor Graphicsr ICstudio 2008.2b of the harmonic mixer for the Bluetooth and UWB standards with the UMC 0.18μm Mixed Mode and RF CM...

The design and characterization of a CMOS circuit for Morlet wavelet generation is introduced. With the proposed Morlet wavelet circuit, it is possible to reach a low power consumption, improve standard deviation (σ) control and also have a small form factor. A prototype in a double poly, three metal layers, 0.5µm CMOS process from MOSIS foundry wa...

The present chapter is about the synthesis and design of a passive mixer in CMOS technology with output power managment, which satisfies the demands established by Bluetooth and Ultra Wideband (UWB). The simulation in Mentor Graphics? ICstudio 2008.2b of the harmonic mixer for the Bluetooth and UWB standards with the UMC 0.18μm Mixed Mode and RF CM...

The design and simulation of a 2nd harmonic based upconverter is introduced. With the proposed upconverter, it is possible to reach a good noise figure with power and area reduction. The design of the circuit was made with the UMC \(0.18\,\upmu \hbox {m}\) Mixed Mode/RF CMOS technology. However, the design methodology can be extended to a different...