Method and apparatus for correcting signal dependent duty cycle errors in amplitude shift keying receivers

A method comprising:

• detecting a peak voltage;
• generating a first threshold voltage that is proportional to the peak voltage;
• comparing the peak voltage to a second threshold to generate a comparison result;
• delaying the comparison result;
• and
• comparing the delayed comparison result to the first threshold voltage.

An Amplitude Shift Keying (ASK) receiver comprising:

• a filter;
• a demodulator having:
• a peak detector that is coupled to the filter so as to detect a peak voltage, wherein the peak detector has a first capacitor and a first current source;
• a first comparator that is coupled to the peak detector and that receives a threshold voltage;
• a delay line that is coupled to the first comparator;
• an inverter having an input terminal, a first supply terminal, a second supply terminal, and an output terminal, wherein the input terminal of the inverter is coupled to the delay line;
• a second current source that is coupled to the second supply terminal of the inverter;
• a second capacitor that is coupled to the output terminal of the inverter;
• a second comparator that is coupled to the delay circuit;
• an RC circuit that is coupled to the second comparator;
• and
• a V2I converter that is coupled between the peak detector and the second comparator;
• and
• an ADC that is coupled to the demodulator.