W. Stephen Woodward

Stephen Woodward

Steve Woodward has authored over 50 analog-centric circuit designs. A self-proclaimed "certified, card-carrying analog dinosaur", he is a freelance consultant on instrumentation, sensors, and metrology freelance to organizations such as Agilent Technologies, the Jet Propulsion Laboratory, the Woods Hole Oceanographic Institute, Catalyst Semiconductor, Oak Crest Science Institute, and several international universities. With seven patents to his credit, he has written more than 200 professional articles, and has also served as a member of technical staff at the University of North Carolina. He holds a BS (with honors) in engineering from Caltech, Pasadena, Calif., and an MS in computer science from the University of North Carolina, Chapel Hill.

Areas of interest of the author: Analogue Design Supply Oscillators Measurement Signal Processing, Filters Amplifiers Interfaces Audio Automation Light High Voltage Microcontrollers Usage ADC, DAC Digital Power Games

Publications on RadioLocman by the author W. Stephen Woodward:

  1. "Sub-zero" op-amp regulates charge pump inverter
    09-02-2024
  2. More gated 555 astable multivibrators hit the ground running
    23-01-2024
  3. Gated 555 astable hits the ground running
    18-01-2024
  4. A simple, accurate, and efficient charge pump voltage inverter for $1 (in singles)
    10-01-2024
  5. Adding one resistor improves anemometer analog linearity to better than ±0.5%
    29-12-2023
  6. New full-wave precision rectifier has versatile current mode outputs
    22-12-2023
  7. Single supply function generator outputs buffered squares, triangles, and sines
    13-12-2023
  8. Force/sense connection eliminates multiplexer on-resistance error
    08-12-2023
  9. Circuit transmits ARINC 429 data
    04-12-2023
  10. Simultaneously control gain on two independent channels with a single element pot
    23-11-2023
  11. Op-amp wipes out DPOT wiper resistance
    16-11-2023
  12. The DAC buddy
    09-11-2023
  13. 3-leg regulator in shunt mode makes variable power supply symmetrical
    30-10-2023
  14. Temperature controller has "take-back-half" convergence algorithm
    26-10-2023
  15. Adjust op-amp gain from -30 dB to +60 dB with one linear pot
    24-10-2023
  16. Low-cost precision adjustable current reference and application
    19-10-2023
  17. A 50 MHz 50:50-square wave output frequency doubler/quadrupler
    10-10-2023
  18. Minimizing passive PWM ripple filter output impedance: How low can you go?
    05-10-2023
  19. Make gain-control multiplexer RON and ROFF errors (mostly) disappear
    28-09-2023
  20. 1 kHz per degree Kelvin temperature sensor
    08-09-2023
  21. Flip-flop plus choke comprise simple and cheap inductive sensor
    06-09-2023
  22. Dual RRIO op amp makes buffered and adjustable triangles and square waves
    17-08-2023
  23. Light powers isolation amplifier
    27-07-2023
  24. Classic 3-leg adjustable regulators have a shunt mode? Who knew?
    24-07-2023
  25. 300 volt, 4 second, self-calibrating Shannon decoder DAC
    06-07-2023
  26. Self-heated ∆Vbe transistor thermostat needs no calibration
    04-07-2023
  27. Shannon decoder DAC meets UART
    29-06-2023
  28. Nonlinearities of Darlington airflow sensor and VFC compensate each other
    21-06-2023
  29. A "free" ADC
    22-05-2023
  30. Set DC input-stage gain/attenuation over a 96 dB range with PWM
    28-04-2023
  31. Squeeze extra resolution from an 8-bit DAC with Shannon decoder idea
    26-04-2023
  32. DAC (PWM) Controlled Triangle/Sawtooth Generator
    20-04-2023
  33. Adjustable regulator trimmer simple failsafe circuit
    18-04-2023
  34. 555 triangle generator with adjustable frequency, waveshape, and amplitude; and more!
    09-02-2023
  35. Transistor ∆VBE-based oscillator measures absolute temperature
    10-01-2023
  36. The Shannon decoder: A (much) faster alternative to the PWM DAC
    22-12-2022
  37. Cancel PWM DAC ripple and power supply noise
    24-11-2022
  38. CMOS flip-flop used "off label" implements precision capacitance sensor
    28-10-2022
  39. Precision DC motor speed control via pot or DAC
    12-10-2022
  40. Cancel PWM DAC ripple with analog subtraction
    11-10-2022
  41. Linearized portable anemometer with thermostated Darlington pair
    21-09-2022
  42. FemtoAmp offers extreme gain range & isolation
    13-09-2022
  43. Self-heated Darlington transistor pair comprises new air flow sensor
    23-08-2022
  44. New VFC uses flip-flops as high speed, precision analog switches
    02-08-2022
  45. Multiplexed, programmable-gain, track-and-hold amplifier has instrumentation inputs
    21-07-2022
  46. Flying capacitor and negative time constant make digitally programmable-gain instrumentation amplifier
    21-07-2022
  47. Inverted MOSFET helps 555 oscillator ignore power supply and temp variations
    19-05-2022
  48. Add One Resistor to Give Bipolar LM555 Oscillator a 50:50 Duty Cycle
    25-03-2022
  49. Input buffer and attenuator for sound card oscilloscopes extends low-end frequency response
    15-02-2022
  50. Circuit cancels interconnection resistance to enhance load regulation
    26-12-2021
  51. Series vs shunt linear voltage regulation for small solar-photovoltaic power supplies
    14-12-2021
  52. Series-Connected Transistors Use Differential Heating To Sense Airflow
    01-12-2021
  53. Circuit for optical reflex sight adds automatic power-off
    10-03-2021
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