Method and circuit for folded analog-to-digital converter (ADC) using frequency detectors and time detectors

A method for converting an analog input signal to a digital output signal, the method comprising:

• converting the analog input signal to at least one intermediate signal having a frequency dependent on the analog input signal;
• dividing a frequency of said at least one intermediate signal to generate a frequency divided signal;
• determining said frequency of said at least one intermediate signal and said frequency divided signal;
• and
• processing said determined frequency of said at least one intermediate signal and said frequency of said frequency divided signal to generate the digital output signal which is representative of the analog input signal;
• wherein said converting step further comprises converting a voltage of the analog input signal to said intermediate frequency dependent signal;
• wherein said determining step further comprises a step of determining said frequency of said at least one intermediate signal using a first frequency detector and determining said frequency of said frequency divided signal using a second frequency detector.