Reduced line driver output dependency on process, voltage,...

Details Reduced line driver output dependency on process, voltage,... Reduced line driver output dependency on process, voltage,...

2011-05-17

2011-05-17

Luu, An T (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

C327S109000, C327S512000

Reexamination Certificate

active

07944251

ABSTRACT:
According to one exemplary embodiment, a transmitter module includes a line drive including a current digital-to-analog converter, where the line driver provides an analog output waveform. The current digital-to-analog converter receives a digitally filtered input waveform including at least two voltage steps. The at least two voltage steps of the digitally filtered input waveform cause a rise time of the analog output waveform to have a reduced dependency on process, voltage, and temperature variations in the line driver, while meeting stringent rise time requirements. The digitally filtered input waveform has an initial voltage level and a final voltage level, where the final voltage level is substantially equal to a sum of the at least two voltage steps of the digitally filtered input waveform.

REFERENCES:
patent: 4656428 (1987-04-01), Ishikawa
patent: 4804863 (1989-02-01), Welland et al.
patent: 4959616 (1990-09-01), Matsumoto
patent: 5196732 (1993-03-01), Takahashi et al.
patent: 2006/0139193 (2006-06-01), Morrow et al.
patent: 2009/0195319 (2009-08-01), Yazicioglu et al.

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