Boots – shoes – and leggings
Patent
1978-05-19
1980-04-15
Ruggiero, Joseph F.
Boots, shoes, and leggings
250205, 331 945S, 328144, 364573, 364814, G06G 720, G01J 132, H04B 900
Patent
active
041986750
ABSTRACT:
Linearization of a closed-loop acousto-optic modulation system is maintained over a uniform closed-loop bandwidth that is independent of the output light intensity level through the use of a compensating square-root function generator which employs the third quadrant characteristic of a MOSFET. The MOSFET may be connected as the feedback impedance of an operational amplifier which provides the square-root gain control function for complementing the non-linearity of the acousto-optic modulator. By utilizing the third quadrant characteristics of the source-to-drain voltage relative to the drain current of the MOSFET, the square-root function generator has a transfer function which insures that a linear relationship between modulator output light intensity and input signal current can be obtained irrespective of light intensity.
In accordance with a preferred embodiment of the present invention, the operational amplifier of the square-root function generator may be supplied with an offset voltage in order to insure that the desired square-root transfer function can be attained regardless of differences in the manufactured characteristics of the field effect transistors that may be used. Temperature compensation circuitry may also be adopted as part of the square-root gain control component of the system to counteract the temperature sensitivity of the MOSFET's square-root current-voltage characteristic.
REFERENCES:
patent: 3517179 (1970-06-01), Herndon
patent: 3585392 (1971-06-01), Korpel
patent: 3633124 (1972-01-01), Danielmeyer
patent: 3727062 (1973-04-01), Foster
patent: 3879687 (1975-04-01), Daehlin et al.
patent: 3898447 (1975-08-01), Bozarth, Jr.
patent: 4092530 (1978-05-01), Wise
Harris Corporation of Cleveland, Ohio
Ruggiero Joseph F.
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