Patent ID: 7952429
Filing Date: 2011-05-31
Classification: H03F

Abstract:
1. A multiple-input and multiple-output amplifier comprising: a common input terminal, n signal input terminals, n signal output terminals and a reference terminal, where n is an integer greater than or equal to 2; at least one common terminal amplifier, each of the common terminal amplifiers being an amplifier comprising an input terminal and an output terminal, the input terminal of each of the common terminal amplifiers being coupled to the common input terminal; a number n of active sub-circuits, each of the active sub-circuits having a sub-circuit input terminal, a sub-circuit output terminal and a sub-circuit common terminal, the sub-circuit input terminal being coupled to one of the signal input terminals, the sub-circuit output terminal being coupled to one of the signal output terminals, each of the active sub-circuits being such that the current flowing out of the sub-circuit common terminal and the current flowing into the sub-circuit output terminal depend on the voltage between the sub-circuit input terminal and the sub-circuit common terminal, each of the signal input terminals being coupled to only one sub-circuit input terminal, each of the signal output terminals being coupled to only one sub-circuit output terminal; a feedback network having a number n of C terminals and at least one R terminal, each of the C terminals being coupled to the sub-circuit common terminal of one of the active sub-circuits, the output terminal of each of the common terminal amplifiers being coupled to one of the R terminals, the feedback network being such that, in a known frequency band, the impedance matrix of the C terminals with respect to the R terminals connected the one to the other is a non-diagonal n×n matrix.