Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1998-04-08
2000-11-07
Wamsley, Patrick
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341150, H03M 166, H03M 112
Patent
active
06144331&
ABSTRACT:
An improved successive-approximation type ADC that uses both charge-scaled and voltage scaled approximation. The present invention provides a high noise immunity, high speed ADC using a differential voltage scaled DAC. The differential voltage scaled output scheme of the present invention advantageously applies voltage scaling to a capacitor on both inputs to the comparator. The dual voltage scaling is preferably done by connecting two switches to each tap on the bottom half of a resistor string, and no switches to the top half of the resistor string, using one set of tap switches for adjusting a charge on capacitor on the first input of the comparator and the second set of tap switches for adjusting a charge on capacitor on the second input of the comparator.
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Petersen Bret J.
Telecky Jr. Frederick J.
Texas Instruments Incorporated
Wamsley Patrick
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