System and method of generating signals for analog-digital converter (ADC) calibration

Circuitry comprising:

• a first circuit coupled to an oscillator and configured to:
• receive a signal indicating a first frequency to be used for calibration of an analog-to-digital converter (ADC),
• calibrate a frequency of the oscillator, and
• generate, based at least on the signal and the frequency of the oscillator, one or more first signals;
• and
• a second circuit coupled to the oscillator and configured to:
• receive, from the first circuit, the one or more first signals, and
• control, based at least on the one or more first signals, the oscillator to generate a second signal having the first frequency,
• wherein the first circuit comprises:
• a first counter configured to receive a first clock signal outputted from the oscillator, and
• the frequency of the oscillator is calibrated using the first counter.

A method comprising:

• receiving, by a first circuit coupled to an oscillator, a signal indicating a first frequency to be used for calibration of an analog-to-digital converter (ADC);
• calibrating, by the first circuit, a frequency of the oscillator;
• generating, by the first circuit based at least on the signal and the frequency of the oscillator, one or more first signals;
• receiving, by a second circuit coupled to the oscillator, from the first circuit, the one or more first signals;
• and
• controlling, by the second circuit based at least on the one or more first signals, the oscillator to generate a second signal having the first frequency,
• wherein the oscillator is enabled during the calibration of the ADC and is disabled responsive to the ADC being calibrated.