公开(公告)号：GB2541782B

公开(公告)日：2018-08-22

申请号：GB201611127

申请日：2016-06-27

Applicant: SUNRISE MICRO DEVICES INC

Inventor： ANTHONY KRESIMIR STAMPALIA

IPC: H03F1/14 ,  H03F1/56 ,  H03F3/191 ,  H03F3/193

公开(公告)号：GB2541782A

公开(公告)日：2017-03-01

申请号：GB201611127

申请日：2016-06-27

Applicant: SUNRISE MICRO DEVICES INC

Inventor： ANTHONY KRESIMIR STAMPALIA

IPC: H03F1/14 ,  H03F1/56 ,  H03F3/191 ,  H03F3/193

Abstract: A power-efficient neutralized signal amplifier 100 for use in ultra-low power narrowband receiver applications comprises a transformer 120 having a primary winding 122 and a differential secondary winding 124, coupled to an amplifier input 110; a gain cell 140, having a differential input 142 and a differential output 144, the differential input coupled to the transformer differential secondary winding and the differential output coupled to the amplifier output 160; and a neutralization element 150 coupled to the gain cell differential output and cross-coupled to the transformer differential secondary winding, where the coupling of the neutralization element to the differential secondary winding provides that the input impedance of the neutralized signal amplifier is substantially determined by reflected resistive parasitics of the transformer. The neutralization element may comprise neutralization capacitors (figure 2) or an output transformer coupled to the gain cell differential output (figures 3 and 4).