Analogue-to-digital converter
AssigneeNordic Semiconductor ASA
InventorsCarsten Wulff, Ola Bruset, Werner Luzi
Life of this patent
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Abstract
An integrated-circuit, continuous-time, sigma-delta analogue-to-digital converter has a single-ended analogue input, a converter reference input, and a ground connection. The converter has a resistor-capacitor integrator arranged to receive the single-ended analogue input. The integrator comprises a differential amplifier. The converter also has a clocked comparator connected to an output from the integrator, and circuitry arranged so that reference inputs to the amplifier and to the comparator can be maintained at a common voltage derived from the converter reference input.
Claims9
An integrated-circuit, continuous-time, sigma-delta analogue-to-digital converter having a single-ended analogue input, a converter reference input, and a ground connection, wherein the converter comprises an input resistor having a first end connected to the single-ended analogue input, and an offset resistor having a first end connected to ground, wherein the second ends of the input and offset resistors are connected to an input to a differential amplifier in an RC integrator circuit, wherein the input to the differential amplifier is also selectably connectable through a reference resistor to either the converter reference input or to ground, and wherein the gain of the converter is determined as a function of the ratio of the input resistor value to the reference resistor value and of the ratio of the offset resistor value to the reference resistor value.
Dependencies are inferred from the claim text.