Electronic device including an electronic module and a compensation circuit

An electronic device comprising:

• a power supply terminal configured to be connected to a power supply;
• at least one voltage regulator connected to the power supply terminal;
• at least one electronic module connected to the at least one voltage regulator and configured to consume an electronic module current coming from the power supply;
• and
• a compensation circuit connected to the at least one voltage regulator and configured to receive an auxiliary current generated by the at least one voltage regulator and being equal to a first fraction of the electronic module current consumed by the at least one electronic module, the compensation circuit including:
• a current source connected to the at least one voltage regulator so as to receive the auxiliary current and being configured to supply to a cold point a source current greater than a maximum value of the electronic module current consumed by the at least one electronic module, wherein the current source comprises:
• at least one current mirror configured to generate the source current from a reference current;
• a reference branch;
• and
• an auxiliary current generation branch for each current mirror;
• and
• a compensation stage including:
• a first resistor and a second resistor each having a first terminal connected to the power supply terminal, the first resistor having a first resistive value equal to a second resistive value of the second resistor multiplied by an inverse of a multiplication factor of the first fraction, the first resistor having a second terminal connected to the current source so as to be traversed by an intermediate current equal to a difference between the source current and the auxiliary current;
• a first transistor having a drain connected to a second terminal of the second resistor and a source connected to the cold point;
• and
• a first operational amplifier configured to control the first transistor and having an inverting input connected to the second terminal of the first resistor and a non-inverting input connected to the second terminal of the second resistor, so that the second resistor is traversed by a complementary current equal to the intermediate current multiplied by the multiplication factor.

An electronic device comprising:

• a power supply terminal configured to be connected to a power supply;
• at least one voltage regulator connected to the power supply terminal;
• at least one electronic module connected to the at least one voltage regulator;
• and
• a compensation circuit connected to the at least one voltage regulator, the compensation circuit including:
• a current source connected to the at least one voltage regulator;
• and
• a compensation stage including:
• a first resistor and a second resistor each having a first terminal connected to the power supply terminal, wherein the first resistor has a second terminal connected to the current source;
• a first transistor having a drain connected to a second terminal of the second resistor and a source connected to a cold point;
• a first operational amplifier having an inverting input connected to the second terminal of the first resistor, a non-inverting input connected to the second terminal of the second resistor, and an output connected to a gate of the first transistor;
• a second transistor connecting the current source and the compensation stage to the at least one voltage regulator;
• and
• a second operational amplifier having an output coupled to a gate of the second transistor, an inverting input connected to a source of the second transistor, and a non-inverting input configured to receive a voltage delivered by the at least one voltage regulator to the at least one electronic module.