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CMOS operational amplifier performance at cryogenic temperatures.

Author(s) : SWENSON J. A., BAKER K. D.

Type of article: Article

Summary

The performance of three different two-stage CMOS operational amplifiers (op-amps) at temperatures below 100 K was investigated. The open-loop gain and unity-gain frequency increased by at least a factor of 2 and 1.3, respectively, when cooled from room temperature to 50 K. However, because of current kinks in the n-channel output transistors, all of the op-amps developed severe non-linearities in their output characteristics at temperatures below 50 K with more or less 5 V supplies. Reducing the supply voltages extended the op-amps useful cold temperature operating range. One op-amp was found to operate quite well down to 30 K with the supplies reduced to more or less 2.5 V. Methods of improving the cold temperature operation of CMOS op-amps are discussed.

Details

  • Original title: CMOS operational amplifier performance at cryogenic temperatures.
  • Record ID : 1993-2465
  • Languages: English
  • Source: Cryogenics - vol. 33 - n. 2
  • Publication date: 1993

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