Intersil ICL8038
ICL8038 operation (simplified; sine wave is derived from the triangular wave)

The ICL8038 waveform generator was an Integrated circuit by Intersil designed to generate sine, square and triangular waveforms,[1] based on bipolar monolithic technology involving Schottky barrier diodes.[2] ICL8038 was a voltage-controlled oscillator[3]: 434  capable of producing frequencies between a millihertz and 100 kHz.,[4]: 2  some specimens capable of reaching 300 kHz.[4]: 1  The device has been discontinued by Intersil in 2002.[1][4]: 1 

Triangular waves were produced by charging and discharging a capacitor with constant currents. The triangular waves were converted to sine waves involving a non-linear network.[4]: 4  The output frequency was set either by resistors or the external control voltage.[4]: 6  The temperature drift could be optimized to less than 250ppm/°C by combining it with a PLL.[4]: 1 

Maxim designed a copy of the ICL8038 and marketed it as the MAX038. Both devices have since been discontinued.

See also

References

  1. 1 2 Santo, Brian (1 May 2009). "25 Microchips That Shook the World". IEEE Spectrum: Technology, Engineering, and Science News. Institute of Electrical and Electronics Engineers. Retrieved 7 January 2019.
  2. ↑ "Precision Waveform Generator/Voltage Controlled Oscillator". Archived from the original on 12 April 2012. Retrieved 7 January 2019.
  3. ↑ Horowitz, Paul; Hill, Winfield (9 April 2015). The art of electronics (Third ed.). Cambridge University Press. ISBN 9780521809269.
  4. 1 2 3 4 5 6 "ICL8038 Datasheet" (PDF). 5 February 2012. Archived from the original (PDF) on 5 February 2012. Retrieved 7 January 2019.
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