Pulse metering architecture

Details Pulse metering architecture Pulse metering architecture

2007-10-09

2007-10-09

Young, Brian (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S145000

Reexamination Certificate

active

11240206

ABSTRACT:
In one embodiment, a subscriber line interface circuit includes circuitry to generate metering pulses for insertion onto a subscriber line. The circuitry includes a cascaded digital-to-analog converter (DAC) structure including a first DAC to convert a digital sine wave into an analog representation, a second DAC to multiply the analog representation with a ramp value to obtain an unscaled output, and a third DAC to multiply the unscaled output with a gain value to generate a metering pulse.

REFERENCES:
patent: 6829353 (2004-12-01), Enriquez
patent: 6895040 (2005-05-01), Zhou
patent: 6934384 (2005-08-01), Hein et al.
patent: 7167557 (2007-01-01), Youngblood
patent: 2005/0002517 (2005-01-01), Hein et al.
patent: 2005/0220293 (2005-10-01), Hein et al.
patent: PCT/AT98/00159 (1999-01-01), None
U.S. Appl. No. 11/240,272, filed Sep. 29, 2005, entitled “Method and Apparatus for Generating A Metering Pulse” by Michael Mills, Marius Goldenberg, Yan Zhou, Jeffrey Whaley.
Silicon Laboratories, “Si3220/Si3225, Dual ProSLIC Programmable CMOS SLIC/Codec”; Jun. 2004; pp. 1-108.

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