Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1991-12-06
1993-01-05
Howell, Janice A.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328145, 330 54, 330277, G06G 724
Patent
active
051773813
ABSTRACT:
A logarithmic amplifier includes amplifier stages having an input transmission line and first and second output transmission lines. The input and output transmission line are coupled by multiple amplifier elements distributed along the transmission lines. One output transmission line forms a high gain low compression path and the other a low gain high compression path. The output transmission lines of each stage are coupled to a combiner from whence the logarithmically amplified output signal is obtained. The logarithmic amplifier stages are readily constructed in MMIC form and multiple stages may be easily cascaded to provide a very large dynamic range.
REFERENCES:
patent: 4668920 (1987-05-01), Jones
patent: 4788509 (1988-11-01), Bahl et al.
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patent: 4885483 (1989-12-01), Aitchison
patent: 4908529 (1990-03-01), Aitchison
patent: 4973918 (1990-11-01), Schindler
patent: 5025234 (1991-06-01), De Luca
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An article entitled "A Logarithmic Distributed Amplifier" by N. Nazoa-Ruiz and C. S. Aitchison, 1990 IEEE MTT-S Digest, pp. 753-756.
An article entitled "A 0.5 to 4 GHz True Logarithmic Amplifier Utilizing Monolithic GaAs MESFET Technology" by Mark A. Smith, IEEE Transactions on Microwave Theory and Techniques, vol. 36, No. 12, Dec. 1988, pp. 1986-1989.
An article entitled "High-Performance GaAs Heterojunction Bipolar Transistor Monolithic Logarithmic IF Amplifiers" by A. K. Oki, M. E. Kim, G. M. Gorman, and J. B. Camou, IEEE Transactions on Microwave Theory and Techniques, vol. 36, No. 12, Dec. 1988, pp. 1958-1965.
Friesen Michael J.
Seely Warren L.
Handy Robert M.
Howell Janice A.
Motorola Inc.
Tran Toan
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