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Authors
W. Stephen Woodward

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: Automation Analogue Design Measurement Signal Processing, Filters Interfaces Microcontrollers Usage Supply Amplifiers Solar Oscillators Audio Light High Voltage ADC, DAC Digital Power Games Wind Energy Beginners

Publications on RadioLocman by the author W. Stephen Woodward:

  1. ∆VBE bread dough incubator
    Dec 10, 2024
  2. 0 V to -10 V, 1.5 A LM337 PWM power DAC
    Dec 2, 2024
  3. RS-232 meets voltage-to-frequency converter
    Nov 19, 2024
  4. Negative time-constant and PWM program a versatile ADC front end
    Nov 18, 2024
  5. Half & Half piezo drive algorithm tames overshoot and ringing
    Nov 12, 2024
  6. 80 MHz VFC with prescaler and preaccumulator
    Oct 28, 2024
  7. Preaccumulator handles VFC outputs that are too fast for a naked CTP to swallow
    Oct 22, 2024
  8. DC-accurate, 32-bit DAC achieves 32-bit resolution
    Oct 21, 2024
  9. Improved PRTD circuit is product of EDN DI teamwork
    Oct 10, 2024
  10. The power of practical positive feedback to perfect PRTDs
    Oct 1, 2024
  11. 20MHz VFC with take-back-half charge pump
    Sep 30, 2024
  12. Take-Back-Half precision diode charge pump
    Sep 26, 2024
  13. Brute force mitigation of PWM VDD and ground "saturation" errors
    Sep 23, 2024
  14. Switch mode hotwire thermostat
    Sep 18, 2024
  15. Digital pot can control gain over a 90 dB span like an electromechanical
    Sep 3, 2024
  16. 8-bit PWM + 8-bit Dpot = 16-bit hybrid DAC
    Aug 29, 2024
  17. Dpot pseudolog + log lookup table = actual logarithmic gain
    Aug 28, 2024
  18. Keep Dpot pseudologarithmic gain control on a leash
    Aug 15, 2024
  19. Synthesize precision Dpot resistances that aren't in the catalog
    Aug 7, 2024
  20. Single supply 200kHz VFC with bipolar differential inputs
    Jul 24, 2024
  21. Voltage inverter design idea transmogrifies into a 1MHz VFC
    Jul 18, 2024
  22. The good, the bad, and the ugly of zero trims
    Jul 18, 2024
  23. Solar day-lamp with active MPPT and no ballast resistors
    Jul 2, 2024
  24. Portable thermal anemometer hot-transistor bias compensation nulls battery discharge droop
    Jun 27, 2024
  25. Getting positive results from NTC thermistors with a simple passive interface
    Jun 25, 2024
  26. I2C active pullup is power thrifty
    Jun 24, 2024
  27. Relay and solenoid driver circuit doubles supply voltage to conserve sustaining power
    May 30, 2024
  28. Improve thermal airflow sensor PSRR with just two resistors
    May 27, 2024
  29. Double and invert 5 V to generate ±10 V using two generic chips and two bootstraps
    May 23, 2024
  30. A groovy apparatus for calibrating miniature high sensitivity anemometers
    May 1, 2024
  31. Efficient digitally regulated bipolar voltage rail booster
    Apr 26, 2024
  32. Driving CMOS totem poles with logic signals, AC coupling, and grounded gates
    Apr 25, 2024
  33. 15-bit voltage-to-time ADC for "Proper Function" anemometer linearization
    Apr 4, 2024
  34. Charge pump halves voltage to double current "efficiency"
    Mar 27, 2024
  35. Efficient voltage doubler is made from generic CMOS inverters
    Mar 14, 2024
  36. Voltage inverter uses gate's output pins as inputs and its ground pin as output
    Mar 13, 2024
  37. ∆Vbe differential thermometer needs no calibration
    Mar 6, 2024
  38. Hotwire thermostat: Using fine copper wire as integrated sensor and heater for temperature control
    Mar 4, 2024
  39. "Sub-zero" op-amp regulates charge pump inverter
    Feb 9, 2024
  40. More gated 555 astable multivibrators hit the ground running
    Jan 23, 2024
  41. Gated 555 astable hits the ground running
    Jan 18, 2024
  42. A simple, accurate, and efficient charge pump voltage inverter for $1 (in singles)
    Jan 10, 2024
  43. Adding one resistor improves anemometer analog linearity to better than ±0.5%
    Dec 29, 2023
  44. New full-wave precision rectifier has versatile current mode outputs
    Dec 22, 2023
  45. Single supply function generator outputs buffered squares, triangles, and sines
    Dec 13, 2023
  46. Force/sense connection eliminates multiplexer on-resistance error
    Dec 8, 2023
  47. Circuit transmits ARINC 429 data
    Dec 4, 2023
  48. Simultaneously control gain on two independent channels with a single element pot
    Nov 23, 2023
  49. Op-amp wipes out DPOT wiper resistance
    Nov 16, 2023
  50. The DAC buddy
    Nov 9, 2023
  51. 3-leg regulator in shunt mode makes variable power supply symmetrical
    Oct 30, 2023
  52. Temperature controller has "take-back-half" convergence algorithm
    Oct 26, 2023
  53. Adjust op-amp gain from -30 dB to +60 dB with one linear pot
    Oct 24, 2023
  54. Low-cost precision adjustable current reference and application
    Oct 19, 2023
  55. A 50 MHz 50:50-square wave output frequency doubler/quadrupler
    Oct 10, 2023
  56. Minimizing passive PWM ripple filter output impedance: How low can you go?
    Oct 5, 2023
  57. Make gain-control multiplexer RON and ROFF errors (mostly) disappear
    Sep 28, 2023
  58. 1 kHz per degree Kelvin temperature sensor
    Sep 8, 2023
  59. Flip-flop plus choke comprise simple and cheap inductive sensor
    Sep 6, 2023
  60. Dual RRIO op amp makes buffered and adjustable triangles and square waves
    Aug 17, 2023
  61. Light powers isolation amplifier
    Jul 27, 2023
  62. Classic 3-leg adjustable regulators have a shunt mode? Who knew?
    Jul 24, 2023
  63. 300 volt, 4 second, self-calibrating Shannon decoder DAC
    Jul 6, 2023
  64. Self-heated ∆Vbe transistor thermostat needs no calibration
    Jul 4, 2023
  65. Shannon decoder DAC meets UART
    Jun 29, 2023
  66. Nonlinearities of Darlington airflow sensor and VFC compensate each other
    Jun 21, 2023
  67. A "free" ADC
    May 22, 2023
  68. Set DC input-stage gain/attenuation over a 96 dB range with PWM
    Apr 28, 2023
  69. Squeeze extra resolution from an 8-bit DAC with Shannon decoder idea
    Apr 26, 2023
  70. DAC (PWM) Controlled Triangle/Sawtooth Generator
    Apr 20, 2023
  71. Adjustable regulator trimmer simple failsafe circuit
    Apr 18, 2023
  72. 555 triangle generator with adjustable frequency, waveshape, and amplitude; and more!
    Feb 9, 2023
  73. Transistor ∆VBE-based oscillator measures absolute temperature
    Jan 10, 2023
  74. The Shannon decoder: A (much) faster alternative to the PWM DAC
    Dec 22, 2022
  75. Cancel PWM DAC ripple and power supply noise
    Nov 24, 2022
  76. CMOS flip-flop used "off label" implements precision capacitance sensor
    Oct 28, 2022
  77. Precision DC motor speed control via pot or DAC
    Oct 12, 2022
  78. Cancel PWM DAC ripple with analog subtraction
    Oct 11, 2022
  79. Linearized portable anemometer with thermostated Darlington pair
    Sep 21, 2022
  80. FemtoAmp offers extreme gain range & isolation
    Sep 13, 2022
  81. Self-heated Darlington transistor pair comprises new air flow sensor
    Aug 23, 2022
  82. New VFC uses flip-flops as high speed, precision analog switches
    Aug 2, 2022
  83. Multiplexed, programmable-gain, track-and-hold amplifier has instrumentation inputs
    Jul 21, 2022
  84. Flying capacitor and negative time constant make digitally programmable-gain instrumentation amplifier
    Jul 21, 2022
  85. Inverted MOSFET helps 555 oscillator ignore power supply and temp variations
    May 19, 2022
  86. Add One Resistor to Give Bipolar LM555 Oscillator a 50:50 Duty Cycle
    Mar 25, 2022
  87. Input buffer and attenuator for sound card oscilloscopes extends low-end frequency response
    Feb 15, 2022
  88. Circuit cancels interconnection resistance to enhance load regulation
    Dec 26, 2021
  89. Series vs shunt linear voltage regulation for small solar-photovoltaic power supplies
    Dec 14, 2021
  90. Series-Connected Transistors Use Differential Heating To Sense Airflow
    Dec 1, 2021
  91. Quickly discharge power-supply capacitors
    May 8, 2021
  92. Circuit for optical reflex sight adds automatic power-off
    Mar 10, 2021
  93. Circuit controls intensity of reflex optical sights
    Mar 3, 2021
  94. DPPs make nonvolatile microvolt DAC
    Dec 21, 2020
  95. Digital potentiometer simulates log taper to accurately set gain
    Feb 12, 2020
  96. Achieve precision temperature control with TEC Seebeck-voltage sampling
    Dec 3, 2019
  97. Thermoelectric-cooler unipolar drive achieves stable temperatures
    Dec 3, 2019
  98. Diodes derive logarithms and exponentials to optically sense AC/DC current
    Oct 20, 2019
  99. Combine two 8-bit outputs to make one 16-bit DAC
    Jun 19, 2019
  100. Synthesize variable in-circuit Rs, Ls, and Cs
    May 12, 2019
  101. Pseudologarithmic thermistor signal conditioning spans wide temperature range
    Nov 20, 2018
  102. Fast PWM DAC has no ripple
    Oct 9, 2018
  103. Isolated Receiver/Converter Uses Multichannel Opto-Isolator
    Jul 18, 2018
  104. Optically Isolated 4- To 20-mA Current-Loop Transmitter Is Accurate, Inexpensive
    Jul 5, 2018
  105. Inverted dual-slope ADC boosts dynamic range
    Mar 28, 2018
  106. Actively driven ferrite core inductively cancels common-mode voltage
    Feb 22, 2018
  107. Linear wind-power meter compensates for temperature
    Jan 29, 2018
  108. Circuit limits dV/dt and capacitor inrush at regulator turn-on
    Jan 23, 2018
  109. Turn negative regulator «upside-down» to create bipolar supply from single source
    Oct 5, 2017
  110. Square-root function improves thermostat
    Apr 26, 2017
  111. Transistor linearly digitizes airflow
    Jan 31, 2017
  112. Amplifier cancels common-mode voltage
    Jan 11, 2017
  113. Fast-settling synchronous-PWM-DAC filter has almost no ripple
    Nov 9, 2016
  114. Battery-powered amplifier has optical isolation
    Nov 3, 2016
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