Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1975-03-19
1976-11-09
Miller, Jr., Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307230, 307255, 307297, H03K 504, H03K 112
Patent
active
039913236
ABSTRACT:
A pulse duration to current converter wherein the output current is proportional to the duty cycle, or duration, of the input pulse. A first current source is modulated by an input signal while a second current source is held constant by an input reference signal level. The sum of the currents from the first and second current sources are averaged by a filter network to produce an output signal that is subsequently applied to the noninverting input of an amplifier to be amplified thereby. An output signal from the amplifier is converted to a current output by an output circuit driven by the amplifier. The output circuit will operate with maximum load impedances by using a level shifter at the input of the amplifier to shift the level of operation of the inverting input of the amplifier away from a power source level supplied to the amplifier. The level shifter includes a third current source wherein the gain of the amplifier is unaffected by the ratio of load impedance of the output transistor and the impedance of the third current source.
REFERENCES:
patent: 3435252 (1969-03-01), Eubanks
patent: 3564444 (1971-02-01), Walsh
patent: 3600527 (1971-08-01), Blashfield
Burton Lockwood D.
Davis B. P.
Halista Mitchell J.
Honeywell Inc.
Marhoefer Laurence J.
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