Window comparator with accurate levels for use in DC-DC converters

A method of windowing an input voltage, comprising:

• dividing an input voltage by a predetermined ratio;
• generating an error signal by subtracting a positive reference voltage from the divided input voltage;
• amplifying the error signal;
• adding the amplified error signal to the positive reference voltage as an offset;
• comparing the sum of the amplified error signal and the positive reference voltage with upper and lower limits of at least one error window;
• and
• outputting the results of the comparison as a quantized control signal.

A feedback circuit configured to generate signals representing the relation of a voltage to be controlled relative to predetermined limits of at least one error signal window, the feedback circuit comprising:

• a voltage divider configured to an input voltage by a predetermined ratio;
• an error amplifier coupled to the voltage divider and configured to generate an amplified error signal by amplifying a difference between the divided input voltage and a first positive reference voltage, the amplified error signal comprising the sum of the first positive reference voltage and the amplified voltage difference;
• and
• at least one window comparator, the at least one window comparator comprising a first comparator and a second comparator coupled to the error amplifier, each comparator configured to compare the amplified error signal with one of the upper limit and the lower limit of the at least one error signal window.