Amplifier circuit

A circuit comprising:

• a loop-filter comprising:
• a loop-filter-output-terminal configured to provide a loop-filter-output-signal;
• a first-integrator, wherein the first-integrator is an active-RC integrator, the first-integrator comprising:
• a first-integrator-input-terminal configured to receive:
• (i) an input-signal, and (ii) a feedback-signal;
• a first-integrator-first-output-terminal configured to provide a first-integrator-first-output-signal, which is proportional to an integral of the signals received at the first-integrator-input-terminal;
• and
• one or more first-integrator-further-output-terminals, which are each configured to provide a first-integrator-further-output-signal that is proportional to an integral of the signals received at the first-integrator-input-terminal;
• one or more further-integrators, wherein:
• each of the one or more further-integrators is a Gm-C integrator,
• the one or more further-integrators are connected in series between the first-integrator-first-output-terminal and the loop-filter-output-terminal,
• each of the further-integrators comprises a further-integrator-output-terminal and a further-integrator-input-terminal:
• each further-integrator-output-terminal is configured to provide a further-integrator-output-signal that is proportional to an integral of the signals received at its further-integrator-input-terminal;
• for a first further-integrator in the series, the further-integrator-input-terminal is configured to receive the first-integrator-first-output-signal;
• and
• for any subsequent further-integrators in the series, the further-integrator-input-terminal is configured to receive:
• (i) the further-integrator-output-signal from the preceding further-integrator in the series;
• and (ii) one of the first-integrator-further-output-signals.