A simple method of removing receiver noise from microwave noise measurements

A simple method of removing receiver noise from microwave noise measurements

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A simple method is introduced by which, during measurements of noise figure and gain, the output reflection coefficient of the device under test can be adjusted to some constant value without the use of a network analyser, thereby keeping the noise figure of the noise measurement system constant. This removes an important source of error in noise figure and noise parameter measurements.A circulator and tuning network (e.g. a three-stub tuner) are used, but there is no need for the circulator to be tuned for perfect circulation. In an experimental test to verify the accuracy of the method, excess noise temperatures and available gains of a two-port were measured for a wide range of values of the complex reflection coefficient of the noise source and compared against values calculated from the measured scattering parameters of the same two-port.


    1. 1)
      • M. Schwartz . (1959) , Information Transmission, Modulation, and Noise.
    2. 2)
      • Y. Sawayama , K. Mishima . Evaluation method of device noise figure and gain through noise measurements. Proc. IEEE , 12 , 1578 - 1579
    3. 3)
      • J. Helszajn . The synthesis of quarter-wave coupled circulators with Chebyshev characteristics. IEEE Trans. on Microwave Theory and Techniques , 11 , 764 - 769
    4. 4)
      • E. Schwartz . Broadband matching of resonant circuits and circulators. IEEE Trans. on Microwave Theory and Techniques , 3 , 158 - 165
    5. 5)
      • H.L. Swain , R.M. Cox . Noise figure meter sets records for accuracy, repeatability, and convenience. Hewlett-Packard Journal , 5 , 23 - 34
    6. 6)
      • K. Mishima , Y. Sawayama . Comments on “Simultaneous determination of device noise and gain parameters through noise measurement only”. Proc. IEEE , 1 , 100 - 101
    7. 7)
      • G. Caruso , M. Sannino . Computer-aided determination of microwave two-port noise parameters. IEEE Trans. , 9 , 639 - 642
    8. 8)
      • V. Adamian , A. Uhlir . Simplified noise evaluation of microwave receivers. IEEE Trans. on Instrumentation and Measurement , 2 , 136 - 140
    9. 9)
      • E.F. Calandra , G. Martines , M. Sannino . Characterization of GaAs FETs in terms of noise, gain, and scattering parameters through a noise parameter test set. IEEE Trans. , 3 , 231 - 237
    10. 10)
      • G. Martines , M. Sannino . Simultaneous determination of transistor noise, gain, and scattering parameters for amplifier design through noise figure measurement only. IEEE Trans. , 1 , 89 - 91
    11. 11)
      • G. Gonzalez . (1984) , Microwave Transistor Amplifiers Analysis and Design.

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