Dual voltage, self-monitoring line circuit

Details Dual voltage, self-monitoring line circuit Dual voltage, self-monitoring line circuit

1996-08-07

1998-12-29

Zele, Krista

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379377, 379382, H04M 1900

Patent

active

058548394

ABSTRACT:
A line circuit provides BORSCHT functions and supplies the customer loop through a feed resistor network and current limiter either from a high voltage battery to provide for maximum signaling range or from a lower voltage battery to conserve power. The current limiter operates under the control of a microprocessor/DSP which selectively applies or denies power to isolate or include components for testing and controls the switching in and out of transistors to control the scaling factor between the channel width-to-length ratios of the current mirror's input and output FET transistors according to the type of test or operating condition dictated by the microprocessor while the input reference current to the current mirror is maintained constant.

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Motorola Data Sheets for MC 33120 Subscriber Loop Interface Circuit (SLIC), pp. 2-215 through 2-224, Undated.

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