A/D converter
Patent 5225837 Issued on July 6, 1993. Estimated Expiration Date: 
May 29, 2011. 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 29, 2011. 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 References 3242348 Analog/digital converter C-R type D/A converter Digital-to-analog converter Flash analog-to-digital converter with logarithmic/linear threshold voltages Pipelined analog to digital converter with summing and comparator functions occurring in parallel for each bit Patent #: 4994808 InventorsApplicationNo. 706834 filed on 05/29/1991US Classes:341/159, Parallel type341/158Analog input compared with static referenceExaminersPrimary: Logan, Sharon D.Attorney, Agent or FirmForeign Patent References
International ClassH03M 001/36Foreign Application Priority Data1990-06-26 JPAbstractAn A/D converter includes a resistor network generating a reference voltage, a level detector for detecting the level of an input analogue signal with a reference voltage from the resistor network as a reference, and an encoder for providing a digital signal by encoding the output of the level detector. The level detector includes a plurality of comparators for bilevel-processing the input analogue signal with a preselected voltage from the resistor connection nodes of the resistor network as a reference voltage. The resistor network comprises a plurality of resistor elements between a first node receiving a first reference voltage and a second node receiving a second reference voltage, which are interconnected to provide a voltage from an associated connection node that is 1/2j times the difference between said first reference voltage and said second reference voltage. The comparator includes capacitors for providing the difference between the input analogue signal and the reference voltage by a capacitor coupling, and an inverter amplifier for determining the positive or negative of the voltage change generated by the capacitors. This structure implements an A/D converter of high precision with less elements.Other References
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