Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1977-02-16
1978-05-23
Miller, Jr., Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307229, 307230, H03K 1700, G06G 724
Patent
active
040913295
ABSTRACT:
A circuit deriving an output voltage that is proportional to the logarithm of a DC input voltage susceptible to wide variations in amplitude includes a constant current source which forward biases a diode so that the diode operates in the exponential portion of its voltage versus current characteristic, above its saturation current. The constant current source includes first and second, cascaded feedback, DC operational amplifiers connected in a negative feedback circuit. An input terminal of the first amplifier is responsive to the input voltage. A circuit shunting the first amplifier output terminal includes a resistor in series with the diode. The voltage across the resistor is sensed at the input of the second DC operational feedback amplifier. The feedback voltage derived from the output of the second amplifier is subtracted by the first amplifier from the input voltage so that the current flowing through the resistor is proportional to the input voltage over the wide range of variations in amplitude of the input voltage.
REFERENCES:
patent: 3444362 (1969-05-01), Pearlman
patent: 3465168 (1969-09-01), Luhowy et al.
patent: 3569739 (1971-03-01), Stolman
Fletcher James C. Administrator of the National Aeronautics and Space
Manus Eugene A.
Wiley Paris H.
Davis B. P.
Manning John R.
Marchant Robert D.
Miller, Jr. Stanley D.
Tresansky John O.
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