Pulse or digital communications – Systems using alternating or pulsating current – Antinoise or distortion
Reexamination Certificate
2006-05-23
2006-05-23
Burd, Kevin (Department: 2631)
Pulse or digital communications
Systems using alternating or pulsating current
Antinoise or distortion
C375S219000
Reexamination Certificate
active
07050509
ABSTRACT:
An improved digital capacitive isolation barrier system is provided that is suitable for use in a telephone or modem where the locally powered circuits must be effectively isolated from the public telephone system, while permitting data transfer across the barrier. In particular, an automatic ADC offset calibration system is provided for determining the magnitude of the ADC offset signal required in the system during a calibration operation, and for providing the calibrated ADC offset signal during normal operation of the isolation barrier system. A modified hybrid circuit is provided for isolating the system input from the telephone line during calibration, and for completing the calibration loop. Fixed bias signals are also provided for the ADC and for a DAC in the system. In a preferred embodiment, the ADC is located on the isolated side of the isolation barrier, while the integrator and register that determine and hold the offset signal are located on the powered side of the isolation barrier.
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Dupuis Timothy J.
Krone Andrew W.
Scott Jeffrey W.
Sooch Navdeep S.
Welland David R.
Burd Kevin
O'Keefe Egan & Peterman, LLP
Silicon Laboratories Inc.
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