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IEEE Transactions on Microwave Theory and Techniques
Volume 48 Number 2, February 2000

Table of Contents for this issue

Complete paper in PDF format

Reduction of Intermodulation Distortion in Microwave Active Bandpass Filters- Theory and Experiments

Kwok-Keung M. Cheng , Member, IEEE and Siu-Chung Chan

Page 221.

Abstract:

This paper examines, both theoretically and experimentally, the dependency of the third-order intermodulation (IM) distortion and power saturation upon circuit and device parameters of an active bandpass filter using negative-resistance compensation. Nonlinear analysis is performed by means of the Volterra series formulation. We show that the IM distortion can be reduced by several orders of magnitude with suitable choice of external gate-source and feedback capacitance values. Measured performances of some 900-MHz experimental MESFET bandpass filters are presented.

References

  1. U. Karacaoglu and I. D. Robertson, "MMIC active bandpass filters using varactor-tuned negative resistance elements", IEEE Trans. Microwave Theory Tech., vol. 43, pp.  2926-2932, Dec.  1995.
  2. B. P. Hopf, I. Wolff and M. Guglielmi, "Coplanar MMIC active bandpass filters using negative resistance circuits", IEEE Trans. Microwave Theory Tech., vol. 42, pp.  2598-2602, Dec.  1994.
  3. V. Aparin and P. Katzin, "Active GaAs MMIC bandpass filters with automatic frequency tuning and insertion loss control", IEEE J. Solid-State Circuits, vol. 30, pp.  1068-1073, Oct.  1995.
  4. I. C. Hunter and S. R. Chandler, "Intermodulation distortion in active microwave filters", Proc. Inst. Elect. Eng., vol. 145, no. 1, pp.  7-12, Feb.  1998.
  5. J. Bussgang, L. Ehrman and J. Craham, "Analysis of nonlinear systems with multiple inputs", Proc. IEEE, vol. 62, pp.  1089- 1119, Aug.  1974.
  6. G. L. Matthaei, L. Young and E. M. T. Jones, Microwave Filter Impedance Matching Networks and Coupling Structures, New York: McGraw-Hill, 1964.