Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Reexamination Certificate
2001-12-19
2003-04-08
Young, Brian (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
C341S120000, C341S150000, C341S172000
Reexamination Certificate
active
06545627
ABSTRACT:
BACKGROUND
Today, many electronic devices, such as computers and cell phones, use analog-to-digital converters (ADCs) to convert analog signals to digital signals. Many analog-to-digital conversion techniques use precise ratio-matching of passive or active components in order to achieve high accuracy. However, semiconductor processing technology may limit the ability to achieve precise matching of components.
Although the use of large components (e.g., large capacitors) may yield precisely matched components, this may not be desirable since it may increase the die area needed for placement of the components. Several conventional ADCs do not use precision ratio-matched components to achieve high accuracy. However, in order to attain ratio-independent operation, these ADCs may use a large number of clock cycles to complete a conversion, thereby increasing the conversion time of the converter.
Thus, there is a continuing need for better ways to perform an analog-to-digital conversion that use less die area and have faster conversion times.
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Onodera et al., “A Cyclic A/D Converter That Does Not Require Ratio-Matched Components”, IEEE Journal of Solid State Circuits, vol. 23, No. 1; Feb. 1988.
Li et al., A Ratio-Independent Algorithmic Analog-To-Digital Conversion Technique, IEEE Journal of Solid State Circuits, vol. SC-19, No. 5, Dec. 1984.
Zheng et al.,“Efficient Error-Canceling Algorithmic ADC”, IEEE International Symposium on Circuits and Systems, May 28-31, 2000, Geneva, Switzerland, pp. I-451-I-544.
Johns et al., “Analog Integrated Circuit Design”, Chapter 13, pp. 504-507, John Wiley & Sons, Canada, 1997.
He Yueming
McDaniel Bart R.
Blakely , Sokoloff, Taylor & Zafman LLP
Intel Corporation
Nguyen John
Young Brian
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