Electric circuitry with differently oriented ring oscillators for strain measurement

An electric circuitry comprising:

• at least one first ring oscillator and at least one second ring oscillator being arranged on a substrate in different orientations;
• a first counter circuit;
• a second counter circuit;
• and
• a processing circuit,
• wherein the at least one first ring oscillator comprises at least one first delay chain and the at least one second ring oscillator comprises at least one second delay chain,
• wherein the at least one first delay chain of a plurality of delay elements and the at least one second delay chain of a plurality of delay elements are arranged on the substrate,
• wherein the respective delay elements of the at least one first and second delay chains are configured to provide a propagation delay time depending on strain applied to the substrate,
• wherein the delay elements of the at least one first delay chain have other orientations on the substrate than the delay elements of the at least one second delay chain,
• wherein the at least one first ring oscillator is configured to operate with a first oscillation frequency,
• wherein the at least one second ring oscillator is configured to operate with a second oscillation frequency,
• wherein the first counter circuit is arranged between at least one first ring oscillator and the processing circuit and configured to count a first number of complete signal runs through the at least one first ring oscillator between an application of a start signal to the at least one first ring oscillator to start the at least one first ring oscillator and an application of a stop signal to the at least one first ring oscillator to stop the at least one first ring oscillator,
• wherein the second counter circuit is arranged between at least one second ring oscillator and the processing circuit and configured to count a second number of complete signal runs through the at least one second ring oscillator between an application of the start signal to the at least one second ring oscillator to start the at least one second ring oscillator and an application of a stop signal to the at least one second ring oscillator to stop the at least one second ring oscillator, and
• wherein the processing circuit is configured to determine a magnitude of the strain applied on the substrate depending on the first and second oscillation frequencies.