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Radiolocman.com - All about electronics
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: Measurement Signal Processing, Filters Supply Analogue Design Automation Oscillators Amplifiers Interfaces Audio Light High Voltage Microcontrollers Usage ADC, DAC Digital Power Games Wind Energy Beginners

Publications on RadioLocman by the author W. Stephen Woodward:

  1. 15-bit voltage-to-time ADC for "Proper Function" anemometer linearization
    04-04-2024
  2. Charge pump halves voltage to double current "efficiency"
    27-03-2024
  3. Efficient voltage doubler is made from generic CMOS inverters
    14-03-2024
  4. Voltage inverter uses gate's output pins as inputs and its ground pin as output
    13-03-2024
  5. ∆Vbe differential thermometer needs no calibration
    06-03-2024
  6. Hotwire thermostat: Using fine copper wire as integrated sensor and heater for temperature control
    04-03-2024
  7. "Sub-zero" op-amp regulates charge pump inverter
    09-02-2024
  8. More gated 555 astable multivibrators hit the ground running
    23-01-2024
  9. Gated 555 astable hits the ground running
    18-01-2024
  10. A simple, accurate, and efficient charge pump voltage inverter for $1 (in singles)
    10-01-2024
  11. Adding one resistor improves anemometer analog linearity to better than ±0.5%
    29-12-2023
  12. New full-wave precision rectifier has versatile current mode outputs
    22-12-2023
  13. Single supply function generator outputs buffered squares, triangles, and sines
    13-12-2023
  14. Force/sense connection eliminates multiplexer on-resistance error
    08-12-2023
  15. Circuit transmits ARINC 429 data
    04-12-2023
  16. Simultaneously control gain on two independent channels with a single element pot
    23-11-2023
  17. Op-amp wipes out DPOT wiper resistance
    16-11-2023
  18. The DAC buddy
    09-11-2023
  19. 3-leg regulator in shunt mode makes variable power supply symmetrical
    30-10-2023
  20. Temperature controller has "take-back-half" convergence algorithm
    26-10-2023
  21. Adjust op-amp gain from -30 dB to +60 dB with one linear pot
    24-10-2023
  22. Low-cost precision adjustable current reference and application
    19-10-2023
  23. A 50 MHz 50:50-square wave output frequency doubler/quadrupler
    10-10-2023
  24. Minimizing passive PWM ripple filter output impedance: How low can you go?
    05-10-2023
  25. Make gain-control multiplexer RON and ROFF errors (mostly) disappear
    28-09-2023
  26. 1 kHz per degree Kelvin temperature sensor
    08-09-2023
  27. Flip-flop plus choke comprise simple and cheap inductive sensor
    06-09-2023
  28. Dual RRIO op amp makes buffered and adjustable triangles and square waves
    17-08-2023
  29. Light powers isolation amplifier
    27-07-2023
  30. Classic 3-leg adjustable regulators have a shunt mode? Who knew?
    24-07-2023
  31. 300 volt, 4 second, self-calibrating Shannon decoder DAC
    06-07-2023
  32. Self-heated ∆Vbe transistor thermostat needs no calibration
    04-07-2023
  33. Shannon decoder DAC meets UART
    29-06-2023
  34. Nonlinearities of Darlington airflow sensor and VFC compensate each other
    21-06-2023
  35. A "free" ADC
    22-05-2023
  36. Set DC input-stage gain/attenuation over a 96 dB range with PWM
    28-04-2023
  37. Squeeze extra resolution from an 8-bit DAC with Shannon decoder idea
    26-04-2023
  38. DAC (PWM) Controlled Triangle/Sawtooth Generator
    20-04-2023
  39. Adjustable regulator trimmer simple failsafe circuit
    18-04-2023
  40. 555 triangle generator with adjustable frequency, waveshape, and amplitude; and more!
    09-02-2023
  41. Transistor ∆VBE-based oscillator measures absolute temperature
    10-01-2023
  42. The Shannon decoder: A (much) faster alternative to the PWM DAC
    22-12-2022
  43. Cancel PWM DAC ripple and power supply noise
    24-11-2022
  44. CMOS flip-flop used "off label" implements precision capacitance sensor
    28-10-2022
  45. Precision DC motor speed control via pot or DAC
    12-10-2022
  46. Cancel PWM DAC ripple with analog subtraction
    11-10-2022
  47. Linearized portable anemometer with thermostated Darlington pair
    21-09-2022
  48. FemtoAmp offers extreme gain range & isolation
    13-09-2022
  49. Self-heated Darlington transistor pair comprises new air flow sensor
    23-08-2022
  50. New VFC uses flip-flops as high speed, precision analog switches
    02-08-2022
  51. Multiplexed, programmable-gain, track-and-hold amplifier has instrumentation inputs
    21-07-2022
  52. Flying capacitor and negative time constant make digitally programmable-gain instrumentation amplifier
    21-07-2022
  53. Inverted MOSFET helps 555 oscillator ignore power supply and temp variations
    19-05-2022
  54. Add One Resistor to Give Bipolar LM555 Oscillator a 50:50 Duty Cycle
    25-03-2022
  55. Input buffer and attenuator for sound card oscilloscopes extends low-end frequency response
    15-02-2022
  56. Circuit cancels interconnection resistance to enhance load regulation
    26-12-2021
  57. Series vs shunt linear voltage regulation for small solar-photovoltaic power supplies
    14-12-2021
  58. Series-Connected Transistors Use Differential Heating To Sense Airflow
    01-12-2021
  59. Quickly discharge power-supply capacitors
    08-05-2021
  60. Circuit for optical reflex sight adds automatic power-off
    10-03-2021
  61. Circuit controls intensity of reflex optical sights
    03-03-2021
  62. DPPs make nonvolatile microvolt DAC
    21-12-2020
  63. Digital potentiometer simulates log taper to accurately set gain
    12-02-2020
  64. Achieve precision temperature control with TEC Seebeck-voltage sampling
    03-12-2019
  65. Thermoelectric-cooler unipolar drive achieves stable temperatures
    03-12-2019
  66. Diodes derive logarithms and exponentials to optically sense AC/DC current
    20-10-2019
  67. Combine two 8-bit outputs to make one 16-bit DAC
    19-06-2019
  68. Synthesize variable in-circuit Rs, Ls, and Cs
    12-05-2019
  69. Pseudologarithmic thermistor signal conditioning spans wide temperature range
    20-11-2018
  70. Fast PWM DAC has no ripple
    09-10-2018
  71. Isolated Receiver/Converter Uses Multichannel Opto-Isolator
    18-07-2018
  72. Optically Isolated 4- To 20-mA Current-Loop Transmitter Is Accurate, Inexpensive
    05-07-2018
  73. Inverted dual-slope ADC boosts dynamic range
    28-03-2018
  74. Actively driven ferrite core inductively cancels common-mode voltage
    22-02-2018
  75. Linear wind-power meter compensates for temperature
    29-01-2018
  76. Circuit limits dV/dt and capacitor inrush at regulator turn-on
    23-01-2018
  77. Turn negative regulator «upside-down» to create bipolar supply from single source
    05-10-2017
  78. Square-root function improves thermostat
    26-04-2017
  79. Transistor linearly digitizes airflow
    31-01-2017
  80. Amplifier cancels common-mode voltage
    11-01-2017
  81. Fast-settling synchronous-PWM-DAC filter has almost no ripple
    09-11-2016
  82. Battery-powered amplifier has optical isolation
    03-11-2016
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