Boots – shoes – and leggings
Patent
1984-02-23
1986-08-26
Harkcom, Gary V.
Boots, shoes, and leggings
367 25, 367911, 324351, G06F 1520, G01V 100
Patent
active
046086366
ABSTRACT:
A signal amplifier system for use in a downhole logging system wherein a signal transmitter is mounted in a sonde suspended on a logging cable thousands of feet into a borehole. Variable slew rate amplifiers connected to a differential amplifier are set forth. Preferably, programmable amplifiers having a gain determined by a driving current are used. Two such amplifiers are connected to the input signal, and they are driven by different current sources. The output signals are summed at a differential amplifier. Through the use of different slew rates, the incoming signal is amplified by the two programmable amplifiers and the outputs of the two amplifiers are then subtracted from one another. Signals which pass equally through both programmable amplifiers (due to slew rates which do not cause limiting) thus are subtracted from each other. Faster rise time signal pulses are amplified by different gains; the differential of the two amplified signals (having differing gain rates) enables noise reduction at the differential amplifier output. The differential output signal is reduced in noise amplitude.
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Beard W. J.
Halliburton Company
Harkcom Gary V.
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