Ring voltage generation circuit and method for generating a...

Details Ring voltage generation circuit and method for generating a... Ring voltage generation circuit and method for generating a...

2007-08-14

2007-08-14

Harold, Jefferey F. (Department: 2614)

Telephonic communications

Subscriber line or transmission line interface

Power supply

C379S418000, C379S251000, C379S252000

Reexamination Certificate

active

10909743

ABSTRACT:
The present invention relates to a ring voltage generation circuit for generating a ring voltage (VTR) between a TIP lead (9) and a RING lead (10) with minimized power loss for electronic subscriber circuits, comprising:a) an amplifier circuit (2) which receives an input voltage (VI) for amplifying the input voltage (VI) to provide the ring voltage (VTR);b) an absolute value generator (3) which receives the input voltage (VI), measures an absolute value (|VI|) of the input voltage (VI) and outputs the measured absolute value (|VI|) of the input voltage (VI);c) a DC/DC converter (4) which receives the measured absolute value (|VI|) of the input voltage (VI) and converts the measured absolute value (|VI|) of the input voltage (VI) into a supply voltage (VSUPPLY) for the amplifier circuit (2); andd) a common mode feedback device (5) which receives the supply voltage (VSUPPLY), a TIP potential (VT) of the TIP lead (9) and a RING potential (VR) of the RING lead (10) and which generates thereof a control voltage (VC), whereas the common mode feedback device (5) controls the amplifier circuit (2) by means of the control voltage (VC)

REFERENCES:
patent: 4431868 (1984-02-01), Bolus et al.
patent: 6026159 (2000-02-01), Apfel
patent: 6310954 (2001-10-01), Vegter
patent: 32 21 693 (1984-01-01), None

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