Apparatus and method for generating temperature-indicating signal using correlated-oscillators

A method comprising:

• generating a first oscillating signal with a first frequency that varies with a sensed temperature and a reference parameter, wherein generating the first oscillating signal comprises applying complementary bias voltages to a set of transmission gates coupled between a set of inverters, respectively, wherein the complementary bias voltages vary with the sensed temperature and the reference parameter;
• generating a second oscillating signal with a second frequency that varies with the reference parameter;
• and
• generating a signal indicative of the sensed temperature based on a ratio of the first frequency to the second frequency.

An apparatus comprising:

• means for generating a first oscillating signal with a first frequency that varies with a sensed temperature and a reference parameter, wherein the means for generating the first oscillating signal comprises:
• a ring oscillator comprising:
• a set of inverters;
• a set of transmission gates situated between the set of inverters, respectively;
• and
• means for applying complementary bias voltages to the set of transmission gates, wherein the complementary bias voltages vary with the sensed temperature and the reference parameter;
• means for generating a second oscillating signal with a second frequency that varies with the reference parameter;
• and
• means for generating a signal indicative of the sensed temperature based on a ratio of the first frequency to the second frequency.