Circuit and method for generating reference signals for hybrid analog-to-digital convertors

A circuit configured to generate a plurality of reference signals for an analog-to-digital convertor (ADC) comprising a first stage and a second stage, the circuit comprising:

• a first reference source comprising a first output terminal and a second output terminal coupled to respective terminals of the first stage of the ADC, the first reference source being configured to generate a first reference voltage between the first output terminal and the second output terminal of the first reference source, the first reference voltage being configured to be provided as a first reference signal to the first stage of the ADC, the first reference voltage comprising a first transient signal generated by the first stage of the ADC;
• a filter coupled to the first output terminal and the second output terminal of the first reference source and configured to filter the first transient signal from the first reference signal to produce a filtered first reference signal;
• and
• a second reference source having input terminals coupled to the filter, wherein the filter comprises at least one first capacitive element coupled between the input terminals of the second reference source, the second reference source comprising a first output terminal and a second output terminal coupled to respective terminals of the second stage of the ADC, the second reference source configured to generate a second reference signal between the first output terminal and the second output terminal of the second reference source based on the filtered first reference signal, the second reference signal being configured to be provided as a second reference signal to the second stage of the ADC.