Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1988-09-29
1990-06-26
Zazworsky, John
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307548, 307550, 330284, 333 81R, H03K 508, H01P 122
Patent
active
049374664
ABSTRACT:
The present disclosure provides a variable attenuator for attenuating alternating signals, preferably, in a frequency band extending from approximately 10 Hz to 30 MHz. The invention utilizes a junction field-effect transistor (JFET) as a variable impedance. The low drain-to-source capacitance exhibited by the JFET allows it to be modeled as a variable resistor or potentiometer. Further, the low drain-to-source capacitance of the JFET improves the bandwidth of the attenuator. A remote DC control signal defines the resistance provided by the JFET. A feedback loop, responsive to the resistance of the JFET and the remote control signal, controls the resistance provided by the JFET in a linear manner. The DC control signal is low-pass filtered at the feedback loop to reduce any high frequency noise acquired during transmission.
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Osterkamp Jeff B.
Paulsen Mark T.
Ball Corporation
Zazworsky John
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