Recycling A/D converter
Patent 6320530 Issued on November 20, 2001. Estimated Expiration Date: 
May 31, 2020. 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.
May 31, 2020. 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 ReferencesAnalog-to-digital conversion circuit with improved differential linearity Pipelined multi-stage analog-to-digital converter Digital to analog converter using capacitors and switches for charge distribution Recirculating A/D or D/A converter with single reference voltage Patent #: 6016115 InventorAssigneeApplicationNo. 583869 filed on 05/31/2000US Classes:341/163, Recirculating341/172Using charge transfer devices (e.g., charge coupled devices, charge transfer by switched capacitances)ExaminersPrimary: Lam, Tuan T.Attorney, Agent or FirmForeign Patent References
International ClassH03M 001/66Foreign Application Priority Data1999-06-01 JPAbstractAfter a second (i.e., 2nd -step) A/D conversion code n2 is produced from an A/D conversion circuit 1, a switch S10 is turned off and a switch S11 is turned on so that an operational amplifier 3 and a capacitor CF cooperate as a hold circuit. Arrayed capacitors C0 to C7 are charged based on an output voltage of the operational amplifier 3. Next, switches S11 and S12 are turned off and switches S13 to S15 are turned on to initialize the electric charge of the capacitor CF to 0 and to charge a capacitor CIN to a predetermined level (=V1+VOFF), wherein VOFF is an offset voltage of the operational amplifier 3. Subsequently, switches S13 to S15 are turned off and the switch S12 is turned on. Then, the switch S10 is turned on and switches S0 to S7 are shifted to a reference voltage terminal 2 or to a ground terminal GND, thereby implementing charge redistribution.Other References
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