Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1997-12-22
2000-07-18
Kim, Jung Ho
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
307 60, G05F 302
Patent
active
060912847
ABSTRACT:
A current control circuit is provided which is capable of maintaining a constant DC current flowing in a load resistor irrespective of the resistance value of a load resistor connected to a connection terminal. To this end, a constant current circuit (21) is connected to a RING terminal (2), which acts as the connection terminal. The constant current circuit (21) controls a current drive circuit (6) in response to a voltage at the RING terminal (2) to ensure that a DC current flowing in a power feed resistor (4) is kept constant. Due to the fact that DC current flowing in the load resistor irrespective of the resistance value of the load resistor is kept constant, the burden placed on a power supply of a subscriber line interface in a telecommunications network is no longer increased. Also, there no longer arises a need for increasing a power feed resistance and the rating of a power feed transistor, which, in turn, leads to a reduction in manufacturing cost.
REFERENCES:
patent: 4008418 (1977-02-01), Murphy
patent: 5079497 (1992-01-01), Barbu et al.
patent: 5442277 (1995-08-01), Mori et al.
patent: 5578960 (1996-11-01), Matsumura et al.
patent: 5808458 (1998-09-01), Fujisawa et al.
patent: 5861771 (1999-01-01), Matsuda et al.
Kim Jung Ho
Murata Manufacturing Co. Ltd.
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