Differential amplifier circuit

A differential amplifier circuit comprising:

• a differential input portion for amplifying a differential input signal to produce an amplified differential signal taken between a pair of terminals thereof;
• and
• first, second, third, and fourth main amplifiers, each having a first flow electrode, a second flow electrode, and a control electrode for controlling current transmission between the flow electrodes, the first and second amplifiers being of like polarity with their control electrodes connected together for receiving a substantially constant bias voltage, the third and fourth amplifiers being of like polarity with their control electrodes connected together for receiving a control voltage dependent on the voltage at the second electrode of the first amplifier, the third and fourth amplifiers being complementary to the first and second amplifiers, the first electrodes of the third and fourth amplifiers respectively coupled to the terminals, the second electrodes of the first and third amplifiers coupled together, and the second electrodes of the second and fourth amplifiers coupled together for supplying an output signal representative of the input signal.