Skills and Experience
The following is a description of some of InCircuits Inc. projects:
One of the most significant projects for ETS-Lindgren was to develop the new flagship probe of the Holaday line of probes, the HI-6105, as well as the laser control unit, for this probe is similar to the HI-6005, ( you can read the patent to see how the HI-6005 is designed ), except that is has no battery!! It is powered via a laser over the optical fiber interface. This was proposed this to ETS-Lindgren, and they were excited about the idea. Developing the laser controller was very interesting and there were many new obstacles to overcome, and we succeeded in making another excellent product. The laser is modulated in order to accommodate communication to the probe, and the laser power level is adjusted using a closed loop system, where the probe communicates the output voltage of the photovoltaic converter to the controller, and the controller adjusts the laser power for optimal performance. There is also a safety interlock system in order to shut down the laser in case the optical fiber is disconnected during operation, or prevent the laser from turning on if the optical fiber is not connected and the system is turned on.
Photonic Power Systems makes one of the components that was being used, and asked for the development of a proof of concept for them. They wanted to power a GPS unit using laser power over optical fiber in order to collect time stamping information from the GPS system. Much experience using GPS chip sets was gained during this project.
An application engineer for AMI Semiconductor asked if a demo board could be made that would be used to demonstrate the functionality of some of their industrial chips. This board demonstrated their I2C micro stepping motor driver chip, high power LED driver /relay Octal High Side Driver chip, EEPROM, 16-bit Sigma-Delta ADC, and a custom 8051 based micro controller.
Waterstrike, Inc. asked for a speedometer calibrator for S&S Cycle to be developed. S&S Cycle has been testing one of these continuously for several years, and it has still not failed. Instrumentation for the Naturevision AquaVu and WellVu lines of products, adding temperature, depth, and compassing measurement capability and using video overlay circuitry to display the data to the user has also been developed. The Motorized AquaVu product has a high current buck-boost switching power supply and motor controller circuitry. A proof of concept unit for another product that uses a wireless data link and operates using very low power, such that the battery life will be over ten years has also been developed.
A medical start up company, whose product would apply electronic signals to tissue, and the applied signal was required to maintain charge balance per a standard, needed development resources. A specialized interface circuit that provided synthetic tissue parameters and instrumentation circuitry to supply the measurement signal to a Linear Technology 24 bit Delta-Sigma ADC was designed to test the charge balance of the unit. With a noise floor of less than 4ppm, very accurate measurements were achieved.
Additional Work Experience
Digital Signal Processor, Micro-Controller, and FPGA Circuit Designs including NEC, ST Micro, Motorola, Atmel, Texas Instruments, PIC, Xilinx, and Altera
VHDL Design / Xilinx Vivado
Firmware Design in Assembly, C and C++
Low Power, Low Noise, High Precision Analog Sensor Instrumentation Circuitry
Instrumentation of sensors for Earth Field, ELF, VLF, VHF, UHF, Broadband - Induced Current, E-Field, H-Field
Transducer Interface Circuitry - Optical Encoder, NMEA , GPS, Pressure Sensor, Temperature Sensor, Gas Gauging
Battery Management System Design for battery powered portable devices
Low Noise Power Supply Regulation
Laser Power Over Optical Fiber System Design - Light Powered Sensors
Low Noise Printed Circuit Board Design
High Current Power Supply Regulation, Buck/Boost, Modulated Constant Current
High Current Motor Control Circuitry, DC Brushless, Stepper
Low Power Fiber Optic Processor to Processor Serial Communication Circuitry
Micropower RF transceiver wireless data link
Mathematical Linearization Techniques for High Precision Calibration of Sensors
Coordination and Specification of build and test for system hardware
Minnesota licensed Professional Engineer