Fully differential reference driver for pipeline analog to digital converter
August 23, 2022. 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 ReferencesDelta sigma analog-to-digital converter having programmable resolution/bias current circuitry and method Mask programmable low power voltage/current-mode ADC Switched-capacitor sigma-delta analog-to-digital converter with input voltage overload protection Sigma delta modulator with automatic saturation detection and recovery Programmable analog arithmetic circuit for imaging sensor Programmable configuration, level and output voltage range circuits and methods for signal processors Reference voltage stabilization in CMOS sensors Switched-capacitor summer circuits and methods and systems using the same Patent #: 6570519 InventorApplicationNo. 10226018 filed on 08/23/2002US Classes:341/161, Acting sequentially341/172Using charge transfer devices (e.g., charge coupled devices, charge transfer by switched capacitances)ExaminersPrimary: JeanPierre, PeguyAttorney, Agent or FirmInternational ClassH03M 138AbstractAn analog to digital conversion (ADC) circuit is disclosed including a fully differential reference voltage source. The reference voltage source includes a programmable current supply adapted to drive a programmed current through a resistor so as to establish an initial reference voltage. The initial reference voltage is sampled onto a capacitive network during a first sampling time interval. The capacitive network is coupled to a differential input of a fully differential amplifier, and maintained at a differential output of the differential amplifier during a second output time interval. An output coupling between the differential output and differential input of the differential amplifier acts to maintain stability of the output voltage during the output time interval. | |
