Signal-conditioning and analog-to-digital conversion circuit architecture
February 24, 2024. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesDigital isolation monitor for an electrical power system Switched-capacitor one-bit digital-to-analog converter with low sensitivity to op-amp offset voltage Advanced digital flux gate magnetometer Voltage-to-frequency converter Position detection device Four quadrant multiplying apparatus and method Switched capacitor circuit adapted to store charge on a sampling capacitor related to a sample for an analog signal voltage and to subsequently transfer such stored charge Self-calibrating position transducer system and method Multi-mode analog front-end Non-linear function generating circuit and method InventorsAssigneeApplicationNo. 10785831 filed on 02/24/2004US Classes:341/118, CONVERTER COMPENSATION341/111, PHASE OR TIME OF PHASE CHANGE341/120, CONVERTER CALIBRATION OR TESTING341/155Analog to digital conversionExaminersPrimary: Tokar, MichaelAssistant: Mai, Lam T. Attorney, Agent or FirmInternational ClassH03M001/06AbstractAn 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.Other References
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