Electricity: power supply or regulation systems – Input level responsive – Using a linearly acting final control device
Patent
1980-10-02
1982-05-25
Shoop, William M.
Electricity: power supply or regulation systems
Input level responsive
Using a linearly acting final control device
307296R, 324 62, 323315, G05F 500
Patent
active
043319130
ABSTRACT:
A negative impedance circuit comprising a level shifter and a current mirror, includes calibration circuitry for adjusting the negative impedance to provide the precise amount of current required to compensate for current drain caused by a known impedance at varying voltage levels. A divider/multiplier circuit is connected to the line which has the known impedance and provides a signal which is directly proportional to the voltage level on the line to the level shifter which, in turn, provides a corresponding control current to the current mirror. The current mirror provides a proportional current to the line current supplied by the current mirror and may be measured at a calibration resistor and the divider multiplier circuit may be adjusted to the appropriate ratio until the exact amount of current required to offset the drain to the precision resistor is provided by the current mirror.
REFERENCES:
patent: 3310737 (1967-03-01), Ripper
patent: 3835410 (1974-09-01), Wittlinger
patent: 3952257 (1976-04-01), Schade, Jr.
patent: 3969637 (1976-07-01), Minami et al.
patent: 3986152 (1976-10-01), Howell
patent: 4045746 (1977-08-01), Wheatley, Jr.
patent: 4065726 (1977-12-01), Senger
patent: 4186282 (1980-01-01), Ellson
Bell Telephone Laboratories Incorporated
Shoop William M.
Visserman P.
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