An apparatus comprising: means for amplifying a MM wave input signal comprising a plurality of amplifier stages (1, 2, 3, 4, 5, 6) coupled together to produce an amplified MM wave output signal, the plurality of amplifier stages (1, 2, 3, 4, 5, 6) comprising more than three amplifier stages; two or more feedback elements (FB1, FB2) coupled across the amplifier stages (1, 2, 3, 4, 5, 6), to form two or more interleaved feedback paths, respectively, each interleaved feedback path connecting an output of a corresponding amplifier stage of said plurality of amplifier stages (1, 2, 3, 4, 5, 6) to an input of another corresponding amplifier stage of said plurality of amplifier stages (1, 2, 3, 4, 5, 6), said input and output being different from the respective inputs and outputs of the amplifier stages which are corresponding to the other interleaved feedback paths; each feedback element of the two or more feedback elements (FB1, FB2) coupled across an odd number of the amplifier stages (1, 2, 3, 4, 5, 6) to increase an operating bandwidth, with the exception of a selected feedback element of the two or more feedback elements (FB1, FB2) being coupled across an even number of amplifier stages (1, 2, 3, 4, 5, 6); and means for phase shifting coupled between the selected feedback element and a selected amplifier stage being connected by the respective interleaved feedback path of the selected feedback element, the means for phase shifting configured to introduce a selected amount of phase shift to cause the selected feedback element to act as if coupled around a selected odd number of amplifier stages (1, 2, 3, 4, 5, 6). means for amplifying a MM wave input signal comprising a plurality of amplifier stages (1, 2, 3, 4, 5, 6) coupled together to produce an amplified MM wave output signal, the plurality of amplifier stages (1, 2, 3, 4, 5, 6) comprising more than three amplifier stages; two or more feedback elements (FB1, FB2) coupled across the amplifier stages (1, 2, 3, 4, 5, 6), to form two or more interleaved feedback paths, respectively, each interleaved feedback path connecting an output of a corresponding amplifier stage of said plurality of amplifier stages (1, 2, 3, 4, 5, 6) to an input of another corresponding amplifier stage of said plurality of amplifier stages (1, 2, 3, 4, 5, 6), said input and output being different from the respective inputs and outputs of the amplifier stages which are corresponding to the other interleaved feedback paths; each feedback element of the two or more feedback elements (FB1, FB2) coupled across an odd number of the amplifier stages (1, 2, 3, 4, 5, 6) to increase an operating bandwidth, with the exception of a selected feedback element of the two or more feedback elements (FB1, FB2) being coupled across an even number of amplifier stages (1, 2, 3, 4, 5, 6); and means for phase shifting coupled between the selected feedback element and a selected amplifier stage being connected by the respective interleaved feedback path of the selected feedback element, the means for phase shifting configured to introduce a selected amount of phase shift to cause the selected feedback element to act as if coupled around a selected odd number of amplifier stages (1, 2, 3, 4, 5, 6).