High performance inductive sensing all digital phase locked loop

An apparatus comprising:

• a plurality of inductive elements;
• an inductive measurement circuit comprising:
• a multiplexer coupled to the plurality of inductive elements;
• a voltage bias circuit coupled to the plurality of inductive elements;
• and
• a capacitor coupled between the voltage bias circuit and an output of the multiplexer, wherein the multiplexer is to selectively couple an inductive element of the plurality of inductive elements to the capacitor, wherein the inductive measurement circuit is to output a first signal with a first frequency, and wherein the first signal is associated with an inductance change of the inductive element;
• and
• a feedback circuit comprising:
• a first transistor coupled to the output of the multiplexer, wherein the first transistor is to receive the first signal;
• a second transistor coupled between the first transistor and a third transistor;
• and
• the third transistor coupled to a ground potential, wherein the feedback circuit is to detect a first level of the first signal at the first transistor and reduce the first level to a second level responsive to detecting the first level at the first transistor;
• and
• a frequency divider circuit coupled to the inductive measurement circuit, wherein the frequency divider circuit is configured to generate a second signal with a second frequency that is lower than the first frequency.