Analog-to-digital converter

Details Analog-to-digital converter Analog-to-digital converter

H - Electricity

03

M

354/82

H03M 1/36 (2006.01) H03M 1/00 (2006.01)

Patent

CA 1194600

ANALOG-TO-DIGITAL CONVERTER ABSTRACT OF THE DISCLOSURE An analog-to-digital converter for converting an analog input voltage signal to a digital output voltage signal of m upper bits and n lower bits includes at least (2m+n-1) resistors connected in a series circuit to a voltage source for establishing respective reference voltages; at least (2m-1) upper bit voltage comparators for generating outputs indicative of the m upper bits, and having first and second inputs, the analog input voltage being applied to the first inputs and the second inputs being connected to the series circuit at respective intervals defining groups of the resistors; an upper bit encoder receiving the outputs of the upper bit voltage comparators and generating a switch control signal and a digital output voltage signal of m upper bits; at least (2n-1) lower bit voltage comparators for generating outputs indicative of the n lower bits, and having first and second inputs, the analog input voltage signal being applied also to the first inputs of the lower bit voltage comparators; switch elements associated with each of the groups and being responsive to the switch control signal for selectively connecting the second inputs of the lower bit comparators to respective resistors in the associated resistor groups; and a lower bit encoder receiving the outputs of the lower bit voltage comparators and generating a digital output voltage signal of n lower bits.

406882

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