Converter for analog inputs

A method comprising:

• generating, by a first oscillator circuit, a first signal with a first frequency based on an analog input and external characteristics;
• generating, by a second oscillator circuit, a second signal with a second frequency based on a reference voltage and the external characteristics;
• generating, by a converter, a third signal from the first signal, the third signal having a third frequency;
• generating, by the converter, a fourth signal from the second signal, the fourth signal having a fourth frequency, the fourth frequency being different than the third frequency;
• and
• generating, by the converter, a digital composite signal based on the third signal and the fourth signal, wherein a number of transitions in the digital composite signal over a period of time are indicative of the analog input, and wherein the period of time is based on one of the third frequency of the third signal or the fourth frequency of the fourth signal.

A system comprising:

• a first oscillator circuit configured to generate a first signal with a first frequency based on an analog input and external characteristics;
• a second oscillator circuit configured to generate a second signal with a second frequency based on a reference voltage and the external characteristics;
• a converter configured to:
• generate a third signal from the first signal, the third signal having a third frequency,
• generate a fourth signal from the second signal, the fourth signal having a fourth frequency, the fourth frequency being different than the third frequency, and
• generate a digital composite signal based on the third signal and the fourth signal, wherein a number of transitions in the digital composite signal over a period of time are indicative of the analog input, and wherein the period of time is based on one of the third frequency of the third signal or the fourth frequency of the fourth signal;
• and
• a processor configured to determine the analog input based on the number of transitions in the digital composite signal.