Design and development of module management controller for MicroTCA.4 standard

Objective The MicroTCA.4(MTCA.4)standard systems have been widely used in large-scale scientific facilities such as synchrotron radiation light sources and FELs over the world,covering RF control,beam instrumentation,timing,machine protection,and so on.The MTCA.4 module management controller(MMC)realizes intelligent management of the boards in the chassis through bus protocol and system interaction.It is an important functional module in MTCA.4 standard system.Methods In order to meet the requirements of the large scientific facilities,an MMC module was designed and developed.This design can realize power management of Advanced Mezzanine Card(AMC)and Rear Transition Module(RTM)boards,as well as monitoring the temperature,voltage,and current during operation.The core part of this module is limited into an area of 3 cm 3 cm on the AMC board,leaving large space for subsequent development of functional circuit.Results An AMC board was developed to verify functions of the MMC.Test results indicate that this board is compatible with existing MTCA.4 standard system.Conclusions This MMC solution can be directly and modularly applied to the design of MTCA.4 standard hardware.

A Compact Dual-Port Multi-Band Rectifier Circuit for RF Energy Harvesting

This paper presents a compact multi-band rectifier with an improved impedance matching bandwidth.It uses a combination of–matching network(MN)at Port-1,with a parallel connection of three cell branch MN at Port-2.The proposed impedance matching network(IMN)is adopted to reduce circuit complexity,to improve circuit performance,and power conversion efficiency(PCE)of the rectifier at low input power.The fabricated rectifier prototype operates at 0.92,1.82,2.1,2.46 and 2.65 GHz covering GSM/900,GSM/1800,UMTS2100,and Wi-Fi/2.45–LTE2600.The size of the compact rectifier on the PCB board is 0.13λ_(g)×0.1λ_(g).The fabricated rectifier achieved an RF-to DC(radio frequency direct current)PCE of 31.8%,24%,22.7%,and 15%,and 14.1%for−20 dBm at the five respective measured operating frequencies.The circuit attains a peak RF-to-DC PCE of 82.3%for an input power of 3 dBm at 0.92 GHz.The proposed rectifier realizes an ambient output dc voltage of 454 mV for multi-tone input signals from the two ports.The rectifier drives a bq25504-674 power management module(PMM)to achieve 1.21 V from the two-port connection.The rectifier has the ability to exploit both frequency domain through the multi-band operation with good impedance bandwidth and a spatial domain using dual-port configuration.Hence,it is a potential candidate for various applications in radio frequency energy harvesting(RFEH)system.

OOMMS:A Module Management System Based on an Object-Oriented Model

This paper describes the design rationale of OOMMS,a module management system based on an object-oriented model.The concepts of object and module are defined.Modules refer to the software products in general which have interface parts and body parts.Related concepts of a cluster of modules,versions of a module,and revisions of a version are also defined.The tools for checking in C program modules into OOMMS are discussed.