Subscriber line interface circuit capable of realizing by a C-MO

Details Subscriber line interface circuit capable of realizing by a C-MO Subscriber line interface circuit capable of realizing by a C-MO

1996-09-19

1998-03-31

Zele, Krista

Telephonic communications

Subscriber line or transmission line interface

379390, 379394, 379398, 379413, H04M 100

Patent

active

057347140

ABSTRACT:
A balanced amplifier delivers a detection voltage in order to carry out power supply control. A level shift circuit shifts the level of the detection voltage to a level shift voltage for a +5 Volts system, namely, a low withstand voltage system. An adder adds a reference voltage V.sub.REF2 to the level shift voltage as a D.C bias voltage and produces an added voltage. A variable attenuator attenuates the added voltage and produces an attenuated voltage. A subtracter subtracts the reference voltage V.sub.REF2 from the attenuated voltage and produces a subtracted voltage. The subtracted voltage is converted into a current by a voltage-current converting circuit and turns back to the balanced amplifier as a signal for a high withstand voltage system. Thus, a signal process can be carried out by a circuit of a low withstand voltage.

REFERENCES:
patent: 4147900 (1979-04-01), Gaetano et al.
patent: 4484032 (1984-11-01), Rosenbaum
patent: 4760595 (1988-07-01), Arai
patent: 5227732 (1993-07-01), Hong
patent: 5406631 (1995-04-01), Takeda et al.

Affiliated with

Also associated with

Rating

Subscriber line interface circuit capable of realizing by a C-MO does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Subscriber line interface circuit capable of realizing by a C-MO, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Subscriber line interface circuit capable of realizing by a C-MO will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-58057