Boots – shoes – and leggings
Patent
1991-02-27
1993-03-16
Trans, Vincent N.
Boots, shoes, and leggings
333 173, 333 32, 331 36R, 31511151, H03H 740
Patent
active
051950456
ABSTRACT:
An automatic impedance matching apparatus for matching an RF-signal generator to a load, such as a plasma etching chamber, is disclosed. The matching apparatus comprises a matching network having two variable impedance devices, a tune detector for detecting the condition of the impedance match between the RF-signal and the load, and a controller for modifying the values of the variable impedance components in response to the measured tune condition. The present invention disclosed improve reset and convergence unit and eliminates the need for the "dead-band" provided around the matching point found in prior art impedance matching controllers. Also disclosed is an improved adjustment unit for adjusting the variable impedance components which is faster and more stable than found in prior art controllers. Also disclosed is a normalization unit for normalizing the input detection siganls such that variations in turning performance due to variations in input power level from the source are substantially reduced.
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Hauer Steven E.
Keane Anthony R. A.
ASTEC America, Inc.
Trans Vincent N.
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