Accomplished Projects

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Adaptive Linear And Non-linear Pre-distortions Engine For High Power Amplifiers
Area of Applications: Adaptive Linear and Non-linear Pre-distortions Engine for High Power Amplifiers

Engineering Expertise Involved:

The main technological objective of this project was to develop an adaptive linear and non-linear pre-distortion (ALPD) engine for optimization of bandwidth used in digital broadcasting.

A number of pre-distortion principles and their impact on linearization of the specific PA based on the NXP’s BLF878 LDMOS transistors were experimentally investigated and analyzed. A novel pre-distortion linearization method was developed to take advantage of the parallel processing capabilities of the FPGA (Field Programmable Gate Array) based technology.

Controller Module For Diesel Particulate Filter Monitoring Operation

Area of Applications: Monitoring of exhaust back-pressure levels of vehicles equipped with a special filter for absorption of the vehicles’ soot and reducing air pollution while increasing efficiency of the diesel engines.

Engineering Expertise Involved:
Controller module, LCD display unit and operating software were developed to providing such functions as monitoring and calculating parameters, storing data, communication with the LCD unit and an external computer, and other. The main controller was to communicate remotely with the display module through 433MHz RF-Link.

An external portable unit for remote monitoring of the main controller (Data Logger) via bi-directional RF communication link and to displaying current data of the system performance was conceptualized and implemented.

The new system concept was experimentally developed and verified allowing to providing a remote control of the system performance thus preventing serious structural damages of the exhaust filter.
Numerous hardware and software design iterations were implemented for assuring reliable unit operation and increasing safety level, including circuitry protection, temperature control of the on-board motor drivers, and other.

To implement remote communication with the main control unit, the following engineering expertise approaches were provided:

  • Developing of special techniques for wireless communication;
  • Implementation of reliable communication protocols with low signal/noise ratio suitable for environment with strong electromagnetic interference;
  • Parameters of the RF signal were defined, calculated and simulated;
  • Redundant wire communication channel was conceptualized and implemented for assuring required system safety and reliability.

Technical Documentation Retained
Requirements and design documents, software and firmware codes, mechanical drawings, schematics, bill of materials, design requirements and specifications.

Computerized Electronic Darts Machine

Area of Applications: Sophisticated Programmable Electronic Darts Machine for commercial and home (consumer) use with capabilities of playing with a remote partner.

dartsEngineering Expertise Involved:
A set of electronic modules (Main FPGA-based Controller, Top Display Module, Motion Detector, Audio Amplifier) and operating software platform were developed for Electronic Dart Machines for commercial and home use with capabilities of using both soft and still tip darts while providing electronic game scoring and such beneficial features as conducting remote tournaments via the Internet, displaying game results on a built-in top display and external monitor, automatic player advance, motion detector, and other.

Special techniques and methods were conceptualized and implemented for high-speed and sophisticated data analysis to eliminate confusion of the system while defining and managing multiple hits when next dart hits a tail of a previous one causing double score (“Flightning issue”).
Unique methods and techniques were developed for a Smart Motion Detection algorithm: this method allowed to sensing just a player’s presence while ignoring other motion subjects such as moving and landed darts; the motion sensor was also suggested to be used for implementation of Automatic Player Advance feature.

Technical Documentation Retained
Requirements and design documents, software and firmware codes, mechanical drawings, schematics, bill of materials, design requirements and specifications.

Linearization Of High Power DVB-T Amplifier

Area of Applications: High efficiency processing device for OFDM (Orthogonal Frequency-Division Multiplexing) signals transmission, used in the Digital Terrestrial Television Broadcasting (DTTB) systems

Engineering Expertise Involved:
Developing advanced digital signal processing techniques to optimize interrelation of the transmitting spectral quality and receiver performance while eliminating or significantly lowering digital base-band distortion.
A special test bench platform was implemented allowing to applying the OFDM signal stress for lifetime test of the LDMOS transistor under high power conditions. Through conducting numerous experiments, a trade-off compromise was found between clipping level, shoulder performance, and LDMOS transistor degradation.

Aiming to achieving the highest possible efficiency in developing the HPA protection solutions, new techniques were conceptualized and realized to combat performance degradation while reducing deleterious effects of clippings.

The following design stages were performed throughout implementation of the project:

  • Review of the Design Requirements
  • Completion of the Design Specification
  • Statement of Work and Work Breakdown Structure
  • Preliminary Design Review
  • Design Verification and Validation
  • Building Prototypes
  • Prototype Tests and Debug
  • Pre-production Run
  • Technical Document Review

Technical Documentation Retained
Requirements and design documents, software and firmware codes, mechanical drawings, schematics, bill of materials, test reports, design requirements and specifications.

Portable Controller For Low Level Laser Therapy (LLLT)

Area of Applications: Medical device aimed to be used as a portable Low Intensity Laser Therapy (LILT) operating module allowing patients to treating their soft tissue injuries at home under a medical practitioner’s care.

Engineering Expertise Involved:
Portable Controller module with a graphical LCD display and operating Software (SW) and Firmware (FW) were developed to providing operating of treatment parameters via controlling Laser Head optical power, signal frequency, signal amplitude and shape, duty circle, treatment protocol duration, and other.

Flexible Printed Circuit Boards with on-board controllers were designed and produced as the Red (R) and Infra Red (IR) LED Treatment Heads communicating with the Main Controller Unit via sophisticated interface.
All designed electronic modules passed through regulatory approvals according to medical standards. While performing pre-approval tests, numerous HW and FW troubleshooting procedures were experimentally conducted to assuring the system will comply to safety and other related medical standard regulations and requirements.

The following design stages were performed throughout implementation of the project:

  • Review of the Design Requirements
  • Completion of the Design Specification
  • Statement of Work and Work Breakdown Structure
  • Preliminary Design Review
  • Design Verification and Validation
  • Final Design Review, Risk Analysis and Risk Management
  • Building Prototypes
  • Prototype Tests and Debug
  • Submitting the Unit to Official Standard Approvals
  • Pre-production Run
  • Technical Document Review

Technical Documentation Retained
Requirements and design documents, software and firmware codes, mechanical drawings, schematics, bill of materials, test reports, design requirements and specifications.

Controller For Tennis Ball Machine

Area of Applications: Tennis Ball Machine for commercial and home (consumer) use with capabilities of remote operation in open environment for players’ practicing.

Tennis-ball-2Engineering Expertise Involved:
Developing of a sophisticated Oscillator circuitry, electronic Hardware and Software for a Controller Module for the Tennis Ball Machine for commercial and home (consumer) use with capabilities of remote operation in open environment. A special logic and methodology were developed for efficient factory calibration including, but not limited to generating various forms of oscillation, defining a number of control parameters, their sequences, values, etc.

An efficient Software tool was developed to defining, monitoring, operating and calibrating a number of parameters to maintain maximum flexibility in setting the desired parameters of the Controller.

Series of architectural prototypes were designed to validate requirements, hardware and software architectures to significantly improving quality of the motor operating signals while enhancing the feedback algorithms and accuracy of maintaining the motors’ speed.

The software architecture was continuously tested and debugged to ensuring that all operating parameters have been set to the most efficient levels and ranges.
User interface and structural diagram of the software means were developed for controlling and setting up the oscillating parameters.

A few sets of prototype PCBs were built followed by their functional tests, debug and experimental analysis.

Optimization of GaN High Power Amplifiers
Area of Applications: High Power Amplifiers (HPA) based on Gallium Nitride (GaN) high power transistors for multicarrier Coded Orthogonal Frequency Division Multiplexing (COFDM) signals used in Digital Video and Audio Broadcasting transmitting systems.

Engineering Expertise Involved:

An experimental test platform was developed to be able to keep track of all operational frequencies, powers, voltages and the envelope curves, while measuring and estimating linearity and power added efficiency corresponding to stress operating conditions.

A special method of biasing circuits was empirically implemented based on providing specific power up and power down voltage sequences for preventing GaN transistors to fall into the instability regions.
The optimal and save operational parameters were experimentally estimated and tested for assuring the most efficient performance of a particular HPA module.

Using the GaN high power transistors allowed reduction of required physical space of the overall system due to their higher power density compared to previously used LDMOS transistors.
Several HPA prototypes were designed based on legacy development projects involving a variety of circuit approaches.

A number of experimental iterations were conducted to empirically modify the design to addressing and overcoming numerous technological obstacles and constrains.

Calibration Module for Low-Level Laser Therapy (LLLT)
Area of Applications: Low Level laser Therapy (LLLT) equipment for treatment of soft tissue insures.

Engineering Expertise Involved:laser-amplifier

The technological aim of this work was focused on experimental investigation and creation of a new method, apparatus and protocols to calibrating Red (R) and Infrared (IR) Light Emitting Diodes (LED) and systems used in Low Level laser Therapy (LLLT) equipment for treatment of soft tissue insures.

An experimental test platform was developed to be able to keep track of all operational parameters for monitoring and evaluating laser power dosage, LED optical power levels, signal shape, signal width, amplitude and duty circle, while measuring and estimating operating parameters required for the proper LED calibration.

An electronic circuitry was implemented to interface and operate the photo sensors and the Calibration Head with the main Processor Unit (CPU) so, that it would be able to calculate the received electrical data and convert them into optical measuring parameters.

A special method of a proper calibration and accurate quantifying the LLLT output power intensity was experimentally developed and validated.

A number of experimental iterations were conducted to empirically modify the design to addressing and overcoming numerous technological obstacles and constrains.

Advanced Module for S-Band Amplifier

Area of Applications: High Power Amplifiers (HPA) used in Digital Video and Audio Broadcasting transmitting

Engineering Expertise Involved:HPA

Experimental development of specific low cost High Power S-Band Transmitters for digital broadcasting was performed through extensive Hardware (HW) and Firmware (FW) design iterations. Lateral Diffused Metal Oxide Semiconductors (LDMOS) transistor technology was utilized where the high power output was achieved in a set of High Power Amplifiers (HPA) operating in the 2.3 to 2.5 GHz S-band frequency region.
Several HPA prototypes were designed based on legacy development projects involving a variety of circuit approaches.
A number of experimental iterations were conducted to empirically modify the design to addressing and overcoming numerous technological obstacles and constrains.