Pran Kanai Saha

High-rate reactive deposition of indium oxide films on unheated substrate using ozone gas

Abstract The effectiveness of ozone incorporation in reactive gas of oxygen for producing indium oxide films by DC reactive magnetron sputtering employing a metal target has been investigated. It was found that 4% volume concentration of O 3 in addition to oxygen greatly enhanced the reactivity of the sputtered particles on the substrate of growing surface without substrate heating. The deposition rate of stoichiometric oxide film is found much greater in ozone added environment than that of growing in only oxygen environment.

Development of a neural network based integrated control system of 120 ton/h capacity boiler

Abstract An integrated control system based on artificial neural network (ANN) is presented in this paper to control a 120 ton/h capacity boiler of the Zia Fertilizer Company Limited (ZFCL), Ashuganj, Bangladesh. The process inverse dynamic modelling technique is applied to design the proposed controller. A multilayer feed-forward neural network is trained to identify the unknown inverse dynamic model of the boiler plant by a well known learning algorithm called backpropagation. The training data were collected from the history file of ZFCL. A new software controller is then developed for integrated control system of the ZFCL boiler using the weights of the trained network. Both the training mode and running mode of the developed controller are presented in this paper. The controller output is also converted into electrical signal using pulse width control technique. The generated signal is used for on-line regulation of the control valve through the parallel port of the computer. The developed controller is tested by using the boiler input–output data that are not used during the training. The output response and performance of the developed controller is compared with those of the existing PID controller of the plant.

QoS optimization and performance analysis of NGN

Next Generation Network (NGN) is a packet based network which can support the expansion of broadband and introduction of triple play (Voice +Data +Video) over fixed and mobile line. Before deployment of NGN, the capacity and Quality of Service (QoS) over NGN must be ensured. In this paper, the technologies proposed by Huawei have been applied to ensure the capacity and QoS over NGN. Then the optimized NGN is simulated to observe the effect of the quality factors on the voice performance. The simulation results are then analyzed and verified by theoretical analysis to determine the maximum capacity and QoS which is possible to achieve over the proposed NGN. The simulation results show a good agreement with that of the theoretical results.

Design and Development of an Y4 Copter Control System

The y4 copter is intended to be a UAV (Unmanned Aerial Vehicle) with autonomous subsystems. Automation is implemented in case of maintaining the desired roll, pitch and yaw. An improved algorithm that uses Quaternion is implemented to determine Euler angles avoiding Gimbal lock. It has a self-stabilization system achieved using Proportional Integral Derivative (PID) control system. A custom remote is built to communicate with the y4 copter using XBee modules which offer long range and security. Secured data transmission between the controller and the copter makes it suitable for military applications. Perhaps the most significant purpose of this y4 copter is to exercise a low cost and efficient engineering design with total automation considering all possible aerodynamics which is intended to be the first y4 copter built in the Indian subcontinent.

A new VLSI architecture for a reconfigurable, high-speed, digital Rank Order Filter

A new architecture to realize a moduler, high-speed, reconfigurable, digital rank order filter (ROF) is presented in this paper. A bit-level algorithm by Kar and Pradhan has been modified in this work to implement the proposed rank order filter. Using the proposed digital rank selection circuit it is possible to find the element of a certain rank in a given sequence of N elements in each window in M steps, where M is the number of bits used in binary representation for the elements of the sequence. To implement the algorithm N number of identical bit update circuit (BUC), a parallel counter circuit and a comparator circuit is required. Using parallel processing technique such as data pipelining and block processing the throughput of the circuit could be increased by M times. The performance of the filter was found better in terms of speed, power consumption and reliability.

A low power, high data rate ir-uwb pulse generator with BPSK modulation in 90nm CMOS technology for on-chip wireless interconnects

A CMOS IR-UWB pulse generator for ultra wide-band on-chip wireless communication using simple triangular pulse generation technique has been proposed. This architecture enables low power operation for generation of BPSK modulated ultra short Gaussian monocycle pulses of average duration of 125ps with amplitude of 800mV p-p. The generators pulse rate is 5 Gbps with an energy efficiency of .0455pJ/pulse and a -3dB Bandwidth of 10GHz with a center frequency at 10GHz. The circuit was implemented and simulated in HSPICE using IBM 90nm RF CMOS technology with a supply voltage of 1.2V. Monte Carlo and Corner simulations were performed to evaluate the performance under variation of different parameters.

Performance analysis of an Ultra Wideband Antenna for Wireless Capsule Endoscopy

This paper proposes an Ultra Wideband Microstrip Patch Antenna for Wireless Capsule Endoscopy. An approximate model of the human gastrointestinal environment is designed with CST Microwave Studio, and the antenna is placed in the center. The antenna is small and bent in a fashion so that it can easily be accommodated inside a capsule. Ultra Wideband technology facilitates higher data rate, resulting in faster communication and high-quality images. Reflection Coefficient (S11), SAR, radiation pattern and power consumption are studied

A versatile pulse rate and low power CMOS IR UWB transmitter for medical imaging

This paper presents a low power CMOS impulse radio (IR) ultra-wide-band (UWB) transmitter with wide pulse rate variability for medical imaging. The proposed circuit is based on all digital architecture which generates pulse during high to low transition of input data bits. The simulated results have shown that the circuit can generate Gaussian mono-cycle pulses having pulse width of 120ps and peak to peak voltage of 396mV with pulse repetition rate of ranging from few MHz to 9.1GHz. The -10dB bandwidth was found 11.9GHz (3.1-15 GHz). The UWB transmitter was designed using IBM 130nm CMOS RF technology and simulated in HSpice RF. The simulated results are compared with other reported results.

A high data rate 130nm CMOS IR-UWB transmitter for inter-chip wireless communication

This paper presents a simple CMOS impulse radio (IR) ultra-wide-band (UWB) transmitter designed in IBM 130nm technology for inter-chip wireless communication. The proposed architecture is composed of two Gaussian mono-cycle pulse generators which are capable of producing ultra short BPSK modulated pulses. The average pulse width is about 152ps and the peak-to-peak amplitude is 404 mV with -10 dB bandwidth of 5 GHz from 5 to 10 GHz. Post-layout simulations using 130nm IBM CMOS RF technology shows that the transmitter operates at 5 Gbps data rate and consumes 5mW under a 1.2V power supply.

DSSS IR UWB transceiver for intra/ inter chip wireless interconnect in future ULSI using reconfigurable monocycle pulse

Future intra and inter chip ULSI interconnect systems demand extremely high data rate. Traditional wired interconnection technology is band limited, therefore to meet the future demand of data rate we are reporting a new ultra wide band (UWB) monocycle pulse (MCP) which can be used as transmitting pulse in a single chip implementation of an UWB transceiver for intra and inter chip communication in future ULSI. The MCP power level is 2.7 mW at 1.8 V for an antenna input impedance of 50 Omega. Here DSSS is used only for multiple access. The proposed transceiver is based on double threshold level detector at receiver end and thus precise phase synchronization is not required. Transmission and reception of the proposed DSSS UWB transceiver for multi userspsila application has been confirmed by simulation and results are presented here.