Amplifiers – Signal feedback – Nonlinear impedance element in loop path
Patent
1989-06-16
1990-07-31
Mullins, James B.
Amplifiers
Signal feedback
Nonlinear impedance element in loop path
330 51, 307353, 328151, H03F 134
Patent
active
049453165
ABSTRACT:
A computer implemented control system which includes interface circuitry by which signal intelligence is taken in to the computer from external devices such as sensors and is fed out from the computer to external devices such as actuators which correctively adjust controlled parameters. An interface circuit for each of the several external devices is made "universal" in that either an analog input, bistate input, analog output, or bistate output device may be connected to any given one of the terminal points. A voltage follower amplifier sends the intelligence signal to an output device through a low-cost diode, with negative feedback taken from the downstream side of the diode. When an input device is elected for a given terminal point, simple program editing assures that the diode will be reverse biased to isolate the amplifier from the input signal path. In addition, inaccuracies in the analog output voltage fed to an output device--arising from contact resistances in a separable connector--are drastically reduced by a dual-path separable connector arrangement which provides two independent circuit connections for the output voltage and for negative feedback.
REFERENCES:
patent: 4410855 (1983-10-01), Underhill et al.
Neumeyer Richard E.
Sebald Mark D.
Barber-Colman Company
Mullins James B.
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