Variable duty cycle window detecting analog to digital...

Details Variable duty cycle window detecting analog to digital... Variable duty cycle window detecting analog to digital...

H - Electricity

03

M

354/88

H03M 1/40 (2006.01)

Patent

CA 1307348

Abstract A high resolution analog to digital (A/D) converter amplifies and filters a magnitude difference between a pulse width modulated offset voltage and an input voltage to produce an ampli- fied filtered difference voltage, the duty cycle of offset voltage modulation being adjusted such that the magnitude of the difference voltage is within a narrow input voltage range of a recirculating remainder A/D converter. The amplified, filtered difference voltage is converted to representative digital data by the recirculating remainder A/D converter. A microprocessor, which controls the offset voltage, combines the result with the magni- tude of the offset voltage to produce a compara- tively high resolution digital representation of the input voltage.

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