Analog-to-digital conversion apparatus

Details Analog-to-digital conversion apparatus Analog-to-digital conversion apparatus

H - Electricity

03

M

354/80

H03M 1/00 (2006.01)

Patent

CA 1049148

ANALOG-TO-DIGITAL CONVERSION APPARATUS ABSTRACT OF THE DISCLOSURE An analog-to-digital conversion apparatus wherein, in one embodiment, an input analog current is applied to an input of an integrating circuit, while a switching circuit allows a precision reference current to be summed with the input analog current at the input of the integrating circuit during a first mode of operation of the switching circuit and prevents the precision reference current from being applied to the input of the integrating circuit during a second mode of operation of the switching circuit. The integrating circuit generates a first signal proportional to the integral of the sum of any currents applied to its input. In response to the first signal and to clock pulses, generator means develops an incremental pulse width modulated signal to precisely control the first and second modes of operation of the switching circuit. The incremental pulse width modulated signal and clock pulses are then utilized by an output circuit to generate a digital representation of the amplitude of the input analog current.

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