Differential amplifier arrangement

A differential amplifier arrangement comprising:

• a differential amplifier pair configured as first and second amplifier branches with first and second input terminals respectively, said amplifier branches including first and second input transistors respectively, the first and second amplifier branches being connected at a junction point to a common branch which includes a current source connected to said first and second input transistors;
• and
• a control circuit for regulating the current of said current source to linearize an input/output characteristic of said differential amplifier pair;
• wherein said control circuit comprises a negative feedback circuit including a comparator, a first input of the comparator being connected to a reference voltage terminal to which an external reference voltage is applied, a second input of the comparator being connected to said junction point, and an output of said comparator connected for controlling said current source;
• and
• wherein said reference voltage terminal is coupled to said input terminals whereby said reference voltage follows a common mode voltage on said input terminals.

A differential amplifier arrangement comprising:

• a differential amplifier pair configured as first and second amplifier branches with first and second input terminals respectively, said amplifier branches including first and second input transistors respectively, the first and second amplifier branches being connected at a junction point to a common branch which includes a current source connected to said first and second input transistors;
• a control circuit for regulating the current of said current source to linearize an input/output characteristic of said differential amplifier pair;
• and
• current mirror circuitry controlled by said control circuit and having outputs coupled to said first and second amplifier branches for suppressing common mode output currents therein;
• wherein said control circuit comprises a negative feedback circuit including a comparator, a first input of the comparator being connected to a reference voltage terminal to which an external reference voltage is applied, a second input of the comparator being connected to said junction point, and an output of said comparator connected for controlling said current source.