Economic analog-to-digital converter

Details Economic analog-to-digital converter Economic analog-to-digital converter

H - Electricity

03

M

354/82

H03M 1/12 (2006.01) H03M 1/34 (2006.01) H03M 1/42 (2006.01)

Patent

CA 1287405

ECONOMIC ANALOG-TO-DIGITAL CONVERTER Abstract Currently available flash-type analog-to-digital converters (ADCs) use large quantities of voltage comparators, resistors and logic gates. An 8-bit flash ADC uses 255 comparators, 256 resistors, and a large number of logic gates in the priority encoder which is connected at the comparator outputs. This invention results in an 8-bit ADC that produces the digital output right at the output terminals of 8 voltage comparators. No priority encoder is needed, and therefore no logic gates are required. As well as the 8 voltage comparators, 8 operational amplifiers and 53 resistors are required for an 8-bit version this new type of ADC. The circuit operates by setting the bias voltage levels for the comparatators by means of digital-to-analog converters (DACs). The inputs to each DAC are a reference voltage level and the higher order digital outputs. Substantial component savings are effected for ADCs with any number of outputs bits.

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