Patent ID: 8419274

Claim:
A fully on-chip operating temperature, process, and voltage sensor system, which is configured in a chip, the system comprising: a voltage sensor for detecting an operating voltage of the chip so as to generate a voltage indication signal; a process sensor for detecting a process variation of the chip so as to generate a process indication signal; a temperature sensor for detecting an operating temperature of the chip, the temperature sensor including: a bias current generator for generating an output current related to temperature according to the operating voltage of the chip; a first ring oscillator connected to the bias current generator for being driven by the output current to generate a first oscillation signal; a first fixed pulse generator for generating a first pulse signal with a fixed pulse width; a first AND gate connected to the first ring oscillator and the first fixed pulse generator to perform a logic AND operation on the first oscillation signal and the first pulse signal so as to generate a temperature sensing signal; and a first counter connected to the first AND gate for counting the temperature sensing signal so as to generate the temperature indication signal; and a temperature compensation unit for receiving the voltage indication signal, the process indication signal, and the temperature indication signal to compensate the temperature indication signal.