Balanced driver circuit for eliminating inductive noise

Details Balanced driver circuit for eliminating inductive noise Balanced driver circuit for eliminating inductive noise

1992-06-09

1996-05-21

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Signal transmission integrity or spurious noise override

327403, 327551, 327108, 326 21, 326 30, H03K 1716, H03K 100

Patent

active

055193536

ABSTRACT:
A balanced driver circuit which essentially eliminates inductive noise without a power dissipation penalty is disclosed. The balanced driver circuit is similar to a conventional balanced driver circuit however the circuit is impedance matched at both ends and has resistors connected in series with the outputs of the emitter followers in the chip. The resistors are equal in value to a termination resistor less the output impedance of the emitter followers. The impedance between the pair of signal leads, referred to as the primary and secondary leads is equal to the sum of the termination resistors. The current traversing the secondary lead has the same amplitude, but the opposite sign as the current traversing the primary lead. Thus, there is negligible current return through the common ground leads.

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Katopis, G. A. "Delta-1 Noise Specification for a High-Performance Computing machine", Pro. of the IEEE, vol. 73, No. 9, (1985) pp. 1405-1415.
Ghosh, J. et al. "Reduction of Simultaneous-Switching Noise in Large Crossbar Networks", IEEE Trans. on Circuits and Systems, vol. 38, No. 1 (1991) pp. 86-99.
Davidson, E. E. et al. "The Design of the ES/9000 Module" IEEE Trans. on Comp. Hybrids, and Manufacturing Tech., vol. 14, No. 4 (1991) pp. 744-748.

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