Coded data generation or conversion – Converter compensation
Reexamination Certificate
2005-04-12
2005-04-12
Tokar, Michael (Department: 2819)
Coded data generation or conversion
Converter compensation
C341S111000, C341S120000, C341S155000
Reexamination Certificate
active
06879274
ABSTRACT:
An analog-to-digital metering circuit includes a first programmable gain amplifier to amplify a first voltage signal from a first channel before being received by a first analog-to-digital converter that converts the amplified first voltage signal to a first digital signal. A second programmable gain amplifier amplifies a second voltage signal from a second channel and feds the amplified signal to a second analog-to-digital converter that converts the amplified second voltage signal to a second digital signal. A first lowpass filter circuit receives the first and second digital signals, to generate therefrom, a multi-bit analog-to-digital value. A direct digital synthesizer generates a digital signal representing a predetermined waveform that is fed to a digital-to-analog converter. The second voltage signal and the digital signal representing the predetermined waveform are multiplied together to generate a digital value. Phase shifting circuitry provides a signal representing a 90-degree phase shift of the digital value and a signal representing a 0-degree phase shift of the digital value. RMS circuitry converts the 0-degree phase digital signal into an In-Phase signal and the 90-degree phase digital signal into a Quadrature signal.
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Ashburn, Jr. Michael A.
Daigle Paul
Nestler Eric
Analog Devices Inc.
Gauthier & Connors LLP
Mai Lam T.
Tokar Michael
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