Electronic device

An electronic device comprising:

• a digital circuit to be compensated, arranged to be operated at an operating speed, and comprising a critical path module, said critical path module comprising a first transistor and a second transistor of opposite polarity of said first transistor, the digital circuit comprising a first terminal and a second terminal allowing to modify a threshold voltage of said first transistor respectively of said second transistor, said critical path module being arranged to generate a first delay related to said operating speed,
• a compensation device for compensating PVT variations of said digital circuit and for controlling said operating speed, comprising:
• an oscillator, generating an oscillator signal having a predetermined frequency,
• a critical path replica module, arranged for generating a second delay equal or superior to a first delay of the critical path module of the digital circuit, and comprising a first critical path replica transistor, a second critical path replica transistor of opposite polarity of said first critical path replica transistor, a first critical path replica terminal and a second critical path replica terminal allowing to modify a threshold voltage of said first critical path replica transistor respectively of said second critical path replica transistor,
• a speed measurement module, connected to the oscillator and to the critical path replica module, and arranged to determine a relation between the predetermined frequency of the oscillator and the second delay of the critical path replica module,
• a first compensation terminal,
• a second compensation terminal,
• wherein the first terminal is arranged to be connected to the first critical path replica terminal and to the first compensation terminal, the second terminal is arranged to be connected to the second critical path replica terminal and to the second compensation terminal, and the compensation device further comprises:
• a control module arranged to be connected to the speed measurement module, to the first compensation terminal and to the second compensation terminal, so as to adjust the voltage at the first compensation terminal and at the second compensation terminal, in order to modify the second delay of the critical path replica module so as to operate the digital circuit at the operating speed,
• the electronic device being characterized in that said critical path replica module is a replica of said critical path module of the digital circuit.