Balanced-input current-sensing differential amplifier

A balanced-input current-sensing differential amplifier having a first signal input terminal and a second signal input terminal, the balanced-input current-sensing differential amplifier comprising:

• a first current mirror having an input terminal, a common terminal and at least one output terminal, the input terminal of the first current mirror being coupled to the first signal input terminal, the first current mirror being of a given polarity;
• a second current mirror having an input terminal, a common terminal and at least one output terminal, the input terminal of the second current mirror being coupled to the second signal input terminal, the second current mirror being of the given polarity;
• a third current mirror having an input terminal, a common terminal and at least one output terminal, one of the output terminals of the third current mirror being coupled to the common terminal of the first current mirror and to the common terminal of the second current mirror, the third current mirror being of the given polarity;
• a fourth current mirror having an input terminal, a common terminal and at least one output terminal, the input terminal of the fourth current mirror being coupled to the first signal input terminal, the fourth current mirror being of the polarity opposite to the given polarity;
• a fifth current mirror having an input terminal, a common terminal and at least one output terminal, the input terminal of the fifth current mirror being coupled to the second signal input terminal, the fifth current mirror being of the polarity opposite to the given polarity;
• and
• a sixth current mirror having an input terminal, a common terminal and at least one output terminal, one of the output terminals of the sixth current mirror being coupled to the common terminal of the fourth current mirror and to the common terminal of the fifth current mirror, the sixth current mirror being of the polarity opposite to the given polarity.