公开(公告)号：EP2951923A4

公开(公告)日：2017-01-25

申请号：EP14767828

申请日：2014-03-13

Applicant: INNOPHASE INC

Inventor： TESTI NICOLO ,  LI XI ,  ZHANG XUEJUN ,  XU YANG

IPC: H03F1/26 ,  H03G3/00 ,  H03G3/30 ,  H03G5/14

CPC classification number: H03G3/008 ,  H03G1/0029 ,  H03G1/0088 ,  H03G5/14 ,  H03G5/24

Abstract: A low noise amplifier including a variable gain amplifier stage configured to accept an input signal and to provide a load driving signal; a tunable bandpass filter connected as a load to the variable gain amplifier stage, wherein the bandpass filter includes a cross-coupled transistor pair, and at least one cross-coupled compensation transistor pair biased in a subthreshold region configured to add a transconductance component when the load driving signal is of a magnitude large enough to decreases a transconductance of the cross-coupled transistor pair; and, a controller circuit configured to tune the bandpass filter. The filter can be tuned in respect to the frequency and the quality factor Q.