US 11,079,881 B2 · Signal processing circuit and system

Abstract

A signal processing circuit for processing a sensing signal from a sensor includes an amplifier, an input capacitor group, a compensation capacitor group and first/second switch groups. The amplifier, coupled to a first floating node and a second floating node, is configured to amplify the sensing signal coupled from the first floating node and the second floating node. The first switch group is coupled between a first node group and the first and second floating nodes. The second switch group is coupled between a second node group and the first node group. The input capacitor group is coupled to the second node group and an input node group, and configured to receive the sensing signal coupled from the input node group. The compensation capacitor group is coupled between a compensation node group and the second node group, and configured to receive a compensation signal coupled from the compensation node group.

Claims22

Dependent claims

A signal processing circuit, for processing a sensing signal from a sensor, the signal processing circuit comprising:

an amplifier, coupled to a first floating node and a second floating node, for amplifying the sensing signal coupled from the first floating node and the second floating node, wherein the first floating node and the second floating node are coupled to two input terminals of the amplifier, respectively;
a first switch group, coupled between a first node group and the first floating node and the second floating node;
a second switch group, coupled between a second node group and the first node group;
an input capacitor group, coupled to the second node group and an input node group, and configured to receive the sensing signal coupled from the input node group;
and
a compensation capacitor group, coupled between a compensation node group and the second node group, and configured to receive a compensation signal coupled from the compensation node group.

3 more elements

A signal processing system, for processing a sensing signal from a sensor, the signal processing system comprising:

a signal processing circuit, comprising:
an amplifier, coupled to a first floating node and a second floating node, for amplifying the sensing signal coupled from the first floating node and the second floating node, wherein the first floating node and the second floating node are coupled to two input terminals of the amplifier, respectively;
a first switch group, coupled between a first node group and the first floating node and the second floating node;
a second switch group, coupled between a second node group and the first node group;
an input capacitor group, coupled to the second node group and an input node group, and configured to receive the sensing signal coupled from the input node group;
and
a compensation capacitor group, coupled between a compensation node group and the second node group, and configured to receive a compensation signal coupled from the compensation node group;
an analog to digital converter (ADC), coupled to the signal processing circuit;
and
a digital circuit, coupled to the ADC.

7 more elements

Dependencies are inferred from the claim text.

Signal processing circuit and system

Life of this patent

Signal processing circuit and system

Life of this patent

Abstract

Claims22