Ratio meter of a thermal sensor

A thermal sensor comprising:

• a temperature detector configured to detect a temperature;
• a generator circuit coupled with the temperature detector and configured to generate a temperature-independent signal and a temperature-dependent signal;
• and
• a ratio meter comprising:
• a converter circuit configured to receive the temperature-independent signal and to convert the received temperature-independent signal into a first frequency signal during a first phase and to receive the temperature-dependent signal and convert the temperature-dependent signal into a second frequency signal during a second phase;
• a first counter configured to receive the first frequency signal and to generate a control signal by counting a predetermined number of pulses of the first frequency signal count;
• a delay circuit configured to delay the control signal for a predetermined time delay, the delayed control signal being usable to define the first phase when the delayed control signal is at a first logic level and the second phase when the delayed control signal is at a second logic level;
• and
• a second counter configured to receive the second frequency signal and to generate a count value by counting the second frequency signal.

A method of a ratio meter of a thermal sensor, the method comprising:

• receiving a temperature-independent signal by a converter circuit during a first phase, and converting the temperature-independent signal into a first frequency signal;
• generating a control signal representing a reference time period for counting a predetermined number of pulses relating to the first frequency signal;
• delaying the control signal for a predetermined delay to generate a delayed control signal, the delayed control signal defining a second phase having a time period equal to the reference time period;
• receiving a temperature-dependent signal by the converter circuit during the second phase in response to the delayed control signal, and converting the temperature-dependent signal into a second frequency signal;
• and
• generating a count value relating to the second frequency signal during the second phase.