Line driver with adaptive output impedance

Details Line driver with adaptive output impedance Line driver with adaptive output impedance

1998-02-23

1999-10-26

Sterrett, Jeffrey

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

H04L 2502

Patent

active

059734906

ABSTRACT:
A line driver comprising a first transistor (M1), a first amplifier (A1) and a reference resistor (10) for converting an input voltage (Vin) to a first current (i1) through the first transistor (M1). A second current i2=n*i1 flows through a second transistor (M2) which forms a 1:n current mirror with the first transistor (M1). The current i2 flows to a load (6), if so required via a transmission line (TL). The impedance of the load (6) is equal to the characteristic impedance RL of the transmission line (TL). Thus the impedance seen by the line driver is equal to RL. A second transconductance amplifier (A2) counteracts reflected signals in the output signal (Vout) caused by mismatch between the output impedance of the current mirror (M1, M2) and the impedance seen by the line driver.

REFERENCES:
patent: 4853609 (1989-08-01), Numata et al.
patent: 5021730 (1991-06-01), Smith
patent: 5266887 (1993-11-01), Smith
patent: 5510751 (1996-04-01), Nauta
patent: 5519309 (1996-05-01), Smith
patent: 5585763 (1996-12-01), Navabi et al.
patent: 5694033 (1997-12-01), Wei et al.

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