Title:
【発明の名称】低相互変調歪増幅方法および装置
Document Type and Number:
Japanese Patent JP3081594
Kind Code:
B2
Abstract:
Amplifier-induced intermodulation distortion (IMD) is reduced by encoding (2) a multi-frequency input composite signal into multiple encoded signals that vary from each other in their power amplitudes as a function of frequency, amplifying (6) the encoded signals, and then decoding (4) them in a complementary fashion so as to differentiate between the amplified signal components and the IMD components. The amplified signal components are coherently combined (26) to separate them from the IMD components, which are incoherently combined. The input signal is preferably encoded by dividing it into multiple divided signals (8), introducing relative phase shifts between the divided signals that vary as a function of frequency, and combining the divided and phase shifted signals with each other in a Butler matrix (22) prior to amplification. The phase shifts are introduced by means of time delays (14a, 14b,14c,14N) that are preferably equal to integer multiples of 4 pi divided by the input signal bandwidth.
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Inventors:
James Dee Thompson
Application Number:
JP33435798A
Publication Date:
August 28, 2000
Filing Date:
November 25, 1998
Export Citation:
Assignee:
Hughes Electronics Corporation
International Classes:
H01Q3/40; H03F1/32; H03F3/60; H03F3/68; H04L5/06; (IPC1-7): H03F3/68; H01Q3/40; H03F1/32
Domestic Patent References:
| JP9148849A | ||||
| JP951235A | ||||
| JP8510611A |
Attorney, Agent or Firm:
Takehiko Suzue (4 outside)