Linearizer for microwave amplifier
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United States of America Patent
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Oct 31, 1989
Grant Date -
N/A
app pub date -
Oct 23, 1987
filing date -
Oct 23, 1987
priority date (Note) -
Expired
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Abstract
A microwave signal linearizer for a travelling wave tube amplifier (TWTA) provides for simple and flexible adjustment of a predistortion network suitable for independently compensating for a wide range of travelling wave tube amplifier-induced distortions. The linearizer or predistortion network is formed by three divided parallel passive microwave signal channels, the first channel having a coaxial microwave limiter diode network, the second channel having a variable attenuator for adjusting amplitude modulation (AM/AM) non-linearity, and a third channel for adjusting amplitude modulation to phase modulation (AM/PM) non-linearity. Signals directed to the first and second channels are combined in a 180.degree. hybrid network to produce a difference signal which is directed through a difference channel to a 90.degree. hybrid network. The signals through the third channel are directed to the 90.degree. hybrid network where the difference channel and the third channel are combined and directed to an output channel for providing drive signal to a power amplifier, i.e., a travelling wave tube.
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