Patent ID: 11962331
Assignee: NXP B.V.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A sigma-delta analog to digital converter (ADC) comprising:
an input;
an output;
a passive filter having a filter output, and a filter input coupled to the input;
a gain stage having a gain stage output, and a gain stage input coupled to the filter output;
a quantiser having a quantiser input coupled to the gain stage output, and a quantiser output coupled to the output; and
a feedback resistor having a feedback resistor first terminal coupled to the filter output, and a feedback resistor second terminal configured to receive a negative of a value of the output; and, wherein
the passive filter comprises a first filter resistor coupled between the filter input and the filter output, and a filter capacitor having a filter capacitor second terminal, and a filter capacitor first terminal coupled to the filter output;
the gain stage comprises: a gain element having a gain element input coupled to the gain stage input, and a gain element output coupled to the gain stage output; a first gain stage capacitor having a first gain stage capacitor first terminal coupled to the gain element output; and a first gain stage resistor having a first gain stage resistor first terminal coupled to a first gain stage capacitor second terminal and a first gain stage resistor second terminal; and wherein the gain element comprises one of a transconductance amplifier and a series arrangement of an operational amplifier and a second gain stage resistor.