Common mode compensation circuit for differential amplifiers, corresponding device and method

A circuit, comprising:

• a differential input stage including a first input transistor, a second input transistor and a tail transistor, wherein the first and second input transistors have control terminals configured to receive a differential input signal applied therebetween, wherein the first input transistor has a current flow path coupled between a current flow path of the tail transistor and a first node, while the second input transistor has a current flow path coupled between the current flow path of the tail transistor and a second node;
• a differential output stage including a first output transistor and a second output transistor, wherein the first output transistor has a current flow path between a supply line and a first output node, and wherein a control terminal of the first output transistor is coupled to the first node in the differential input stage;
• wherein the second output transistor has a current flow path between the supply line and a second output node;
• and wherein a control terminal of the second output transistor is coupled to the second node in the differential input stage;
• common-mode control circuitry comprising a first common-mode control transistor and a second common-mode control transistor having current flow paths jointly coupled to a ground current flow path through a common-mode tail transistor, wherein the first common-mode control transistor has a control terminal resistively coupled to both the first output node and the second output node in the differential output stage;
• and
• bias generation circuitry comprising a bias duplicate transistor having a current flow path arranged in a bias current flow line between the supply line and ground, the bias duplicate transistor coupled in a 1:N current mirror circuit arrangement with the tail transistor in the differential input stage.