Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent
1998-03-04
2000-12-26
Smits, Talivaldis I.
Telephonic communications
Subscriber line or transmission line interface
Network interface device
379399, 379412, 379379, 379405, H04M 100
Patent
active
061671347
ABSTRACT:
A CMOS implementation for a DC holding circuit in direct access arrangement (DAA) circuitry is disclosed that provides desirable inductive behavior while minimizing power dissipation required by the CMOS integrated circuit, particularly at high loop currents. The DC holding circuitry disclosed may include MOS transistors located on a CMOS integrated circuit and an off-chip power dissipating resistor that acts to dissipate power external to the CMOS integrated circuit. The CMOS implementation disclosed also allows a path for drawing DC current to power other CMOS circuits (e.g., ADCs and DACs) in the CMOS integrated circuit.
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Scott Jeffrey W.
Sooch Navdeep S.
Welland David R.
Chawan Vijay B
Silicon Laboratories Inc.
Smits Talivaldis I.
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