Patent ID: 8711020
Filing Date: 2014-04-29
Classification: H03M

Abstract:
1. 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.