Dual channel analog to digital converter
AssigneeAnalog Devices, Inc.
InventorsGary R. Carreau, Bruce E. Amazeen, Michael C. W. Coln
Life of this patent
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Abstract
A dual channel ADC uses two digital to analog converters (DACs) and a single comparator to convert two analog input channels. One DAC is used for successive approximation, while the other DAC is used for calibration. The dual channel ADC allows for sampling and conversion of single-ended, pseudo-differential, and fully differential analog input signals while maintaining layout symmetry and reducing crosstalk without substantially increasing circuit area. The single comparator is used for converting both analog input channels. Additional logic (such as switches or digital logic) is used to connect the input sampling capacitors and DACs to the appropriate inputs of the comparator for converting the analog input channels.
Claims23
A dual channel analog to digital converter comprising:
- a first sampling capacitor for sampling a first analog input signal;
- a second sampling capacitor for sampling a second analog input signal;
- a comparator having a first comparator input and a second comparator input;
- input sampling logic operably coupled to cause the first sampling capacitor to sample the first analog input signal and to cause the second sampling capacitor to sample the second analog input signal;
- and
- conversion logic operably coupled to connect the first sampling capacitor to the first comparator input and disconnect the second sampling capacitor from the second comparator input for converting a first analog input signal sample and to connect the second sampling capacitor to the second comparator input and disconnect the first sampling capacitor from the first comparator input for converting a second analog input signal sample.
Dependencies are inferred from the claim text.