Capacitor ratio identification

A method comprising:

• receiving, by a first terminal of a first capacitor, an oscillating signal;
• receiving, by a first terminal of a second capacitor, the oscillating signal;
• receiving, by a delay buffer, a digital signal;
• providing, by the delay buffer, a delayed digital signal, a time delay after receiving the digital signal;
• receiving, by a second terminal of the first capacitor, the delayed digital signal, during a first phase;
• receiving, by the second terminal of the first capacitor, an inverse of the delayed digital signal, during a second phase;
• receiving, by a second terminal of the second capacitor, the delayed digital signal, during a third phase;
• and
• receiving, by the second terminal of the second capacitor, the inverse of the delayed digital signal, during a fourth phase.

A system, comprising:

• an oscillator;
• a digital controller;
• and
• a circuit coupled to the oscillator and to the digital controller, the circuit comprising:
• at least one delay buffer coupled to the oscillator;
• a first sub-circuit coupled to the at least one delay buffer and to the digital controller;
• a first capacitor having a first terminal and a second terminal, the first terminal of the first capacitor coupled to the first sub-circuit and the second terminal of the first capacitor coupled to the oscillator;
• a second sub-circuit coupled to the at least one delay buffer and to the digital controller;
• and
• a second capacitor having a first terminal and a second terminal, the first terminal of the second capacitor coupled to the first sub-circuit and the second terminal of the second capacitor coupled to the oscillator.