Patent ID: 8508301

Claim:
A three dimensional on-chip radio frequency amplifier comprising: a first on-chip transformer comprising a first on-chip inductor and a second on-chip inductor; a second on-chip transformer comprising a third on-chip inductor and a fourth on-chip inductor; and an on-chip transistor comprising a gate, a drain and a source; wherein each of the first, second, third and fourth on-chip inductors comprises a plurality of first segments in a first metal layer; a plurality of second segments in a second metal layer; a first inductor input and a second inductor input, the first and second inductor inputs being located in one of the first metal layer and the second metal layer; and a plurality of through vias coupling the plurality of first segments and the plurality of second segments to form a continuous, non-intersecting path between the first inductor input and the second inductor input; the first on-chip inductor being inductively coupled to the second on-chip inductor, the third on-chip inductor being inductively coupled to the fourth on-chip inductor, and the first, second, third and fourth on-chip inductors not being physically coupled to one another except through ground; the first inductor input of the first on-chip inductor being coupled to an input of the on-chip radio frequency amplifier; the first inductor input of the second on-chip inductor being coupled to the gate of the on-chip transistor; the first inductor input of the third on-chip inductor being coupled to the drain of the on-chip transistor, the first inductor input of the fourth on-chip inductor being coupled to an output of the on-chip radio frequency amplifier; the second inductor input of the first, second, third and fourth on-chip inductors being coupled to ground; and the source of the on-chip transistor being coupled to ground.