Wave transmission lines and networks – Automatically controlled systems – Impedance matching
Patent
1981-11-09
1983-11-01
Gensler, Paul L.
Wave transmission lines and networks
Automatically controlled systems
Impedance matching
178 45, 179 16F, 307521, 333 28R, H03H 1106
Patent
active
044132409
ABSTRACT:
There is disclosed an automatic line buildout circuit which includes in its signal path two variable filters, each implemented by a transconductance operational amplifier circuit. Each filter exhibits a transfer function pole with a frequency which is directly related to a control current applied to that filter. At a point in the signal path after the two variable filters, there is a peak detector which provides an output level proportional to the peak amplitude of the signal in the path, and therefore proportional to the cable length. From the peak detector output level, there is derived for each of the variable filters a control current, related to the output level by a preselected function. For each variable filter, the associated function expresses the relation between cable length and the filter cutoff frequency which is required for proper equalization.
REFERENCES:
patent: 3528040 (1970-09-01), Galvin
patent: 3578914 (1971-05-01), Simonelli
patent: 3644847 (1972-02-01), Neuman
patent: 3667052 (1972-05-01), Effenberger
patent: 3924199 (1975-12-01), Pearlman
patent: 4007340 (1977-02-01), Russell
Gensler Paul L.
Greenberg Howard R.
Hamann H. Fredrick
Rockwell International Cororation
Sewell V. Lawrence
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