Patent ID: 8692617
Filing Date: 2014-04-08
Classification: H03F

Abstract:
1. 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 such that a current flowing through said at least one output terminal of the first current mirror is substantially linearly proportional to a current flowing through said input terminal of the first current mirror, 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 such that a current flowing through said at least one output terminal of the second current mirror is substantially linearly proportional to a current flowing through said input terminal of the second current mirror, the second current mirror being of the given polarity; and a third current mirror having an input terminal, a common terminal and at least one output terminal, said at least one output terminal 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 such that a current flowing through said at least one output terminal of the third current mirror is substantially linearly proportional to a current flowing through said input terminal of the third current mirror, the third current mirror being of the given polarity.