Intermodulation distortion detection in a power shared amplifier

Amplifiers – With plural amplifier channels – Redundant amplifier circuits

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Details

330124D, 330149, H03F 368, H03F 326

Patent

active

056044623

ABSTRACT:
An intermodulation distortion (IMD) detection system improves IMD reduction capability of power shared linear amplifier networks. In one embodiment, first and second power sharing networks, preferably Butler Matrices, are provided with a plurality of linear amplifier circuits coupled therebetween. A plurality of input signals are applied to respective input ports of the first power sharing network, with a portion of each input signal amplified by each amplifier circuit and then recombined in the second power sharing network so that each amplified input signal appears at only one output port of the second power sharing network. An antenna coupled to each of these output ports then radiates the amplified signal energy associated with one of the input signals. A test signal, which may be a dual tone signal, is applied to another input port of the first power sharing network, where it is split and amplified by each amplifier circuit. Each amplifier circuit includes detection circuitry for detecting IMD energy of the test signal produced in the amplifier, which is also indicative of the IMD energy generated due to the amplification of the input signals. The amplified test signal is then recombined by the second power sharing network so that it appears only at one output port, where it is terminated.

REFERENCES:
patent: 3480885 (1969-11-01), Schrank
patent: 3731217 (1973-05-01), Gerst et al.
patent: 3917998 (1975-11-01), Welti
patent: 4618831 (1986-10-01), Egani et al.
patent: 4907004 (1990-03-01), Zacharatos
patent: 4965587 (1990-10-01), Lenormand et al.
patent: 5093668 (1992-03-01), Sreenivas
patent: 5105170 (1992-04-01), Joshi
patent: 5115248 (1992-05-01), Roederer
patent: 5119042 (1992-06-01), Crampton et al.
patent: 5414433 (1995-05-01), Chang
W. A. Sandrin, "The Butler Matrix Transponder", Comsat Technical Review, vol. 4, No. 2, Fall 1974.
B. Widrow et al., "Adaptive Antenna Systems", Proceedings of the IEEE, vol. 55, No. 12, Dec. 1967, pp. 2143-2159.
H. Foster et al., Butler Network Extension To Any Number of Antenna Ports, IEEE Transactions on Antennas and Propagations, Nov. 1970, pp. 818-820.
R. Johnson, Antenna Engineering Handbook, McGraw Hill Publishing Co., 3rd edition, 1993, pp. 20-59 to 20-60.

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