Low power CMOS line driver with dynamic biasing

Details Low power CMOS line driver with dynamic biasing Low power CMOS line driver with dynamic biasing

1997-04-11

1999-07-20

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Slope control of leading or trailing edge of rectangular or...

327108, 327112, 326 82, 326 86, H03K 309

Patent

active

059260491

ABSTRACT:
A low power line driver uses a dynamic biasing scheme together with single ended architecture to achieve low power, fast speed and high return loss. The line driver includes a first and second operation amplifier each having an output port for generating an output pulse signal having a rising and falling edge. The load is coupled to the first and second output port by a transformer. A first and second digital control circuit is coupled to the first and second operational amplifiers to control the operational amplifiers. The first and second operational amplifiers further include a pulse circuit for generating the output pulse signal and a selectable current source having a first mode for injecting a high current to the pulse circuit to provide a high slew rate for the rising edge of the output pulse signal and a second mode for injecting a second current to the pulse circuit during the generation of the remaining portion of the output pulse signal. An output impedance control element is provided for providing a low output impedance during a second phase. A digital control circuit is provided for providing control signals to the pulse circuit and the selectable current source for controlling the timing and generation of the output pulse signal. Finally, a processes compensation circuit is provided for reducing dynamic current amplitude variation for the circuit elements.

REFERENCES:
patent: 5410262 (1995-04-01), Kang
patent: 5471171 (1995-11-01), Itakura et al.
patent: 5512859 (1996-04-01), Moraveji
patent: 5729178 (1998-03-01), Park et al.
patent: 5739715 (1998-04-01), Rawson

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