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Design of Two Wien Bridge Oscillators

  • Valentijn De SmedtEmail author
  • Georges Gielen
  • Wim Dehaene
Chapter
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Part of the Analog Circuits and Signal Processing book series (ACSP, volume 128)

Abstract

In 1939, William Redington Hewlett, finished his master’s degree thesis entitled ‘A New Type Resistance-Capacity Oscillator’ at the Stanford University. The oscillator made use of the RC network originated by Max Wien in 1891 (Williams, J.: Max wien, mr. hewlett, and a rainy sunday afternoon. In: Jim, W (ed.) Analog Circuit Design: Art, Science, and Personalities. Butterworth-Heinemann, Boston, pp. 43–55 (1991)). One of the main problems to obtain a proper sine wave at the output was the amplitude control: if the gain is too low, no oscillations occur, if the gain is too high, a square wave appears at the output. Hewlett proposed the following solution: ‘For the variable resistance, a small tungsten lamp may be used. It is a well-known property of such lamps that as the current through them increases, the filament warms up, thereby increasing the lamp resistance.’ By putting a light bulb in the feedback network, the gain automatically drops when the amplitude increases. This very first Wien bridge oscillator was commercialized together with David Packard as the HP 200, the very first product HP ever built.

Keywords

Supply Voltage Phase Noise Output Resistance Feedback Network Input Transistor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Valentijn De Smedt
    • 1
    Email author
  • Georges Gielen
    • 1
  • Wim Dehaene
    • 1
  1. 1.ESAT-MICASUniversity of LeuvenHeverleeBelgium

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