Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1989-10-02
1990-10-30
Mullins, James B.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307572, 307585, H03K 1716
Patent
active
049671049
ABSTRACT:
The present invention teaches an arrangement for increasing the output impedance of a power amplifier coupled to a capacitively loaded line during the switching of power levels by the amplifier on the line. The arrangement of the invention reduces undesired noise voltage during switching. The present invention achieves this end by using a control circuit composed of a differential amplifier which has one input fed from the junction of an impedance resistor and a transistor that simulate the power stage transistor in the power amplifier being switched. This control circuit provides control voltage outputs to power control transistors which are connected to and control the speed of the power stage transistors used to change and discharge the capcitively loaded line.
REFERENCES:
patent: 4340867 (1982-07-01), Sano
patent: 4504779 (1985-03-01), Haman
patent: 4622482 (1986-11-01), Ganger
patent: 4739193 (1988-04-01), Doty
patent: 4758743 (1988-07-01), Dehganpour et al.
IBM Technical Disclosure Bulletin, vol. 30, No. 9, pp. 174-176, "Low L di/dt Noise Off-Chip Driver".
IBM Technical Disclosure Bulletin, vol. 27, No. 1A, pp. 13-14, "Circuit To Control the Time Rate of Change of Current at the Output Node of an Off-Chip Driver".
Ludwig Thomas
Schettler Helmut
Wagner Otto M.
Zuhlke Rainer
International Business Machines - Corporation
Mullins James B.
Thornton Francis J.
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