Line driver circuit with reduced power consumption

Details Line driver circuit with reduced power consumption Line driver circuit with reduced power consumption

1998-10-16

2000-08-08

Tokar, Michael

Electronic digital logic circuitry

Interface

Current driving

326 30, H03K 190175

Patent

active

06100717&

ABSTRACT:
A differential line driver circuit has a first operational amplifier (202) and a second operational amplifier (204). The operational amplifiers use resistors (214a, 214b, 218a, and 218b) to translate to the input voltages (206 and 208) to output voltages and VOP and VON. Feedback paths containing resistors (216a and 216b) are used to monitor output conditions whereby impedance may be actively synthesized within the operational amplifiers (202 and 204). The combination of the synthesized impedance within the operation amplifiers (202 and 204) and the physical resistance of the elements (220a and 220b) are sufficient to match the line resistance (222) of a communication line. While obtaining impedance matching in accordance with required specifications, the synthesized impedance will allow for the line driver (200) to operate with significantly reduced power consumption.

REFERENCES:
patent: 5509078 (1996-04-01), Hiraoka et al.
Linear Technology Application, Note 16, AN16-19 (1 page).
National Semiconductor Application, Note AN-29, pp. 60-61 (2 pages.).
Sedra, et al., "Microelectronic Circuits", Second Edition, Chpt. 3, pp. 86-149, (1987).

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