Pulse or digital communications – Repeaters – Testing
Patent
1983-12-27
1986-08-12
Olms, Douglas W.
Pulse or digital communications
Repeaters
Testing
375 36, 330195, 330276, 307264, H03H 730, H03H 740
Patent
active
046060464
ABSTRACT:
A converter circuit receives N-rail logic signals and converts them into a precision N-level signal. A pair of line drivers is connected in a balanced output arrangement with the primary winding of an output transformer. In response to the N-rail logic signals, weighted currents are conducted through an input impedance, connected with the line drivers, to a ground reference. As a result the line drivers conduct various levels and polarities of current through the entire primary winding of the output transformer. Thereby a precision N-level signal is produced in a secondary winding of the output transformer and at the converter output terminals.
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AT&T Bell Laboratories
Chin Wellington
Havill Richard B.
Olms Douglas W.
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