Low-power low-voltage multi-level variable-resistor line driver

Details Low-power low-voltage multi-level variable-resistor line driver Low-power low-voltage multi-level variable-resistor line driver

2007-05-22

2007-05-22

Nguyen, Linh My (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

C327S423000

Reexamination Certificate

active

10993107

ABSTRACT:
A low-power multi-level pulse amplitude modulation (PAM) line driver using variable resistors is disclosed for transmitting digital data over controlled-impedance transmission lines. This invention discloses the design of a multi-level PAM driver for high-speed wireline communication, with up to four times improvement in power efficiency over conventional drivers. Two key requirements for high-speed line drivers are first generating the target voltage level onto the controlled-impedance line, and second being impedance matched to the line itself to eliminate signal reflections from the transmitter back to the line. The driver in accordance with the present invention satisfies both of these requirements at very high power efficiency.

REFERENCES:
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Gabara et al., “Digitally Adjustable Resistors in CMOS for High Performance Applications” IEEE Journal of Solid State Circuits, vol. 27, No. 8, Aug. 1992, pp. 1176-1185.

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