Telegraphy – Systems – Line-clearing and circuit maintenance
Patent
1993-05-05
1995-03-07
Chin, Stephen
Telegraphy
Systems
Line-clearing and circuit maintenance
379394, H04L 2502, H04M 900
Patent
active
053960289
ABSTRACT:
A method and apparatus for transmission line termination is provided in which a transmission line (12 and 14) is terminated by transmission gates (20 and 22) at a transmitter (24) and a receiver (26). The resistances of the transmission gates (20 and 22) are controlled by precision resistance control circuits (30 and 31), respectively. Precision resistance control circuit (30) uses a reference resistor (32) to control the resistance of the transmission gate (20).
REFERENCES:
patent: 4661978 (1987-04-01), Hirata
patent: 4713827 (1987-12-01), Lauffer et al.
patent: 5271059 (1993-12-01), Dielacher et al.
Brady, II Wade James
Chin Stephen
Donaldson Richard L.
Holland Robby T.
Kim Kevin
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