Pulse width modulation technique with time-ratio duty cycle computation

A converter, comprising:

• a ramp generator having a ramp control input, a ramp output;
• a first circuit having a maximum voltage input, a minimum voltage input, an analog signal input adapted to receive an analog signal, a ramp input coupled to the ramp output, and a compare output;
• a digital core coupled to the first circuit, in which the digital core is configured to:
• generate a first control signal to the ramp control input to cause the ramp generator to generate the ramp signal;
• based on signals from the first circuit, to determine a ratio of a first time it takes for the ramp signal to exceed the analog input signal from when the ramp signal exceeds the minimum voltage to a second time it takes for the ramp signal to exceed the maximum voltage from when the ramp signal exceeds the minimum voltage;
• and
• generate a pulse width modulation output signal on a pulse width modulation output based, at least in part, on the ratio.