Derek TamSouth Pasadena, CA
Derek Tam Phones & Addresses
South Pasadena, CA
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Us Patents
Reduced Line Driver Output Dependency On Process, Voltage, And Temperature Variations
US Patent:
7944251, May 17, 2011
Filed:
Mar 9, 2009
Appl. No.:
12/381227
Inventors:
Andrew Chen - Redondo Beach CA, US
Joseph Aziz - Irvine CA, US
Derek Tam - Irvine CA, US
Joseph Aziz - Irvine CA, US
Derek Tam - Irvine CA, US
Assignee:
Broadcom Corporation - Irvine CA
International Classification:
H03B 1/00
US Classification:
327108, 327109, 327512
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.
Line Driver With Reduced Dependency On Process, Voltage, And Temperature
US Patent:
8598917, Dec 3, 2013
Filed:
Apr 27, 2011
Appl. No.:
13/095688
Inventors:
Andrew Chen - Redondo Beach CA, US
Joseph Aziz - Irvine CA, US
Derek Tam - Irvine CA, US
Joseph Aziz - Irvine CA, US
Derek Tam - Irvine CA, US
Assignee:
Broadcom Corporation - Irvine CA
International Classification:
H03B 1/00
US Classification:
327108, 327109
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.
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