Stephens Micro Systems Pty Ltd

Excellence in electronic design solutions

RI - Real Intelligence, no artificial stuff here...

I have been providing various industries with Electronic Design and related services for over 4 decades. I have worked with many technologies:

My knowledge extends over a broad range of wireless solutions including:

‣  WiFi (Nordic, ESP and other brands)
‣  Bluetooth and BLE (Bluetooth Low Energy)
‣  Radio Modems (including GSM and AT commanded)
‣  IR (Infrared): short range up to 1.1Mbs

My skills have enabled me to write many low-level drivers to circumvent various bugs within some higher-level modules.

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Wired solutions - My proficiencies include:

‣  Ethernet: TCP, UDP, IPv4, Ipv6, and custom Ethernet
‣  USB
‣  IEEE-488
‣  EISA
‣  PCI
‣  UART
‣  LPT
‣  SPI
‣  I²C
‣  I²S
‣  SCI
‣  LIN
‣  CAN
‣  Others

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Embedded microcontroller solutions:

I am experienced in:
‣  Programming a range of microcontrollers from 8 to 64-bit, with low to high pin count
‣  Complex algorithms
‣  Efficient real time coding
‣  From developing rolling code Garage Remote Control devices to specialised high-speed serial IO extenders
‣  Programming Language C, C++ plus many others
‣  Assembly Language (ARM, 6805, 6808, HC11, HC12, 8051, Z80 plus others)

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DSP solutions...

My extensive range of tools to assist DSP development consist of:
‣  Filters – FIR and IIR
‣  FFT, DFFT, Linear FT
‣  Correlation and Convolution

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Robust interfacing solutions...

Knowing what works and what doesn’t when it comes to IO interfacing allows me to be able to provide a solution to an industry’s nemesis e.g., lightning hitting a communications tower or static electricity generated by a plastic bag making machine. My ability to design for ECM Compliance streamlines this process.

Robustness is not limited to just hardware; all user interfaces need to be robust whether this be hardware or software.

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Logic solutions...

I have been using discrete logic devices and PLDs (Programmable Logic Device) in many of my designs, I know that it is imperative to find the correct balance, saving time and money. While PLDs have the potential to offer a shorter design cycle, this can often backfire causing increased power consumption, a greater complexity with EMC compliance, and lower reliability due to reduced ESD and Latchup immunity.

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Linear and Audio solutions...

Working with linear circuits can be tricky. Good grounding and shielding techniques are important.

Digitisation of linear signals requires a good understanding of Sampling Theorem, antialiasing and reconstruction, ADC (Analogue to Digital Conversion), and DAC (Digital to Analogue Conversion) techniques.

I have a excellent understanding of Compression and Expansion in both the Linear and Digital domains.

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Electric motor control

Having worked with electric motors for some time, I have an excellent understanding of motor control principles. This includes brushed, brushless, induction, synchronous, single phase, multiphase, stepper... and their various amplifiers and drives.

I also have an excellent understanding of position encoding.

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Low power and battery management

I have worked on several projects requiring low power operation, including remote control devices.

These projects are often battery operated and also require battery maintenance solutions.

I have also worked with technologies like solar, supercap, and induction.

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