Folded reference voltage flash ADC and method thereof
AssigneesElectronics and Telecommunications Research Institute, Korea Advanced Institute of Science and Technology
InventorsHyun-Min Bae, Soon-Won Kwon, Se-Jun Jeon
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Abstract
A folded reference voltage flash analog-to-digital (ADC) converter and a method thereof are provided. The flash ADC of the present invention determines the most significant bit (MSB) of an analog input signal, varies a reference voltage input to a plurality of comparators in accordance with the MSB determination result, and determines the remaining bits. Accordingly, input capacitance can be reduced while maintaining the size and power consumption of the ADC.
Claims10
A flash analog-to-digital converter (ADC), comprising:
- a first ADC unit that determines a most significant bit (MSB) of an analog input signal;
- a second ADC unit that includes a plurality of comparators that receive the analog input signal and a reference voltage and determine remaining bits of the analog input signal;
- and
- a reference voltage control unit that varies the reference voltage input to the second ADC unit in accordance with the MSB determination result of the first ADC unit.
A flash analog-to-digital conversion method, comprising:
- determining a MSB of an analog input signal;
- varying a reference voltage input to a plurality of comparators in accordance with the MSB determination result;
- and
- receiving the analog input signal and the varied reference voltage and determining remaining bits of the analog input signal using the plurality of comparators.
Dependencies are inferred from the claim text.