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

Claim 16:
17. A differential sigma-delta analog to digital converter (ADC) comprising
a negative signal input and a positive signal input;
a negative signal output and a positive signal output;
a passive filter having a pair of filter inputs and a pair of filter outputs, each filter input coupled to a respective one of the negative signal input and the positive signal input;
a gain stage having a pair of gain stage inputs and a pair of gain stage outputs, the pair of gain stage inputs being coupled to a respective one of the pair of filter outputs;
a quantiser having a pair of quantiser inputs coupled to a respective one of the pair of gain stage outputs and a pair of quantiser outputs coupled to a respective one of the negative signal output and the positive signal output; wherein
the passive filter comprises a filter resistor coupled between each respective filter input and filter output and a filter capacitor coupled between the pair of filter outputs;
the sigma-delta ADC further comprises: a first feedback resistor coupled between the negative signal output and the filter output corresponding to the positive signal input; and a second feedback resistor coupled between the positive signal output and the filter output corresponding to the negative signal input; and
the gain stage comprises a gain element having a pair of gain element inputs coupled to the pair of gain stage inputs and a pair of gain element outputs coupled to the pair of gain stage outputs and a series arrangement of a first gain stage capacitor, a first gain stage resistor, and a second gain stage capacitor coupled between the pair of gain element outputs.