Circuit for generating a plurality of reference voltages for controlling feedback within the circuit

A circuit comprising:

• an input terminal configured to receive an input-signal;
• an output terminal configured to provide an output-signal;
• a reference circuit comprising:
• a first output terminal configured to provide a first-reference-signal;
• a second output terminal configured to provide a second-reference-signal;
• and
• a third output terminal configured to provide a third-reference-signal,
• wherein:
• the first-reference-signal varies between a high-value and a low-value;
• the second-reference-signal is generated to demarcate signal levels below the low-value;
• the third-reference-signal is generated to demarcate signal levels above the high-value,
• a comparator-block configured to compare a comparator-input-voltage-signal representative of the input-signal received at the input terminal with:
• (i) the first-reference-signal,
• (ii) the second-reference-signal and
• (iii) the third-reference-signal in order to generate a comparison-signal;
• a control-block configured to set the output-signal as one of at least two voltage levels based on the comparison-signal;
• and
• an input-control-circuit configured to apply a feedback-control-signal to the input-terminal based on the comparison-signal.