公开(公告)号：US20180115335A1

公开(公告)日：2018-04-26

申请号：US15509202

申请日：2016-01-24

Applicant: Southeast University

Inventor： CHAO CHEN ,  JIANHUI WU ,  HONG LI

IPC: H04B1/16 ,  H03F3/45

CPC classification number: H04B1/16 ,  H03D7/1441 ,  H03D7/1458 ,  H03D7/1466 ,  H03D7/165 ,  H03D2200/0084 ,  H03F3/195 ,  H03F3/45183 ,  H03F3/45475 ,  H03F2200/451 ,  H03F2203/45116 ,  H03F2203/45288 ,  H03F2203/45481

Abstract: The present invention discloses a low power supply voltage double-conversion radio frequency receiving front end, which can work at a lower power supply voltage in a passive frequency conversion mode; a first frequency conversion unit and a second frequency conversion unit of the front end are directly cascaded, and a second orthogonal passive frequency conversion shifts a low input impedance of a transimpedance amplifier to an intermediate frequency, so as to construct a band-pass filtering function for radio frequency current; and the radio frequency current which has undergone two frequency conversions is converted into an output intermediate frequency voltage via the transimpedance amplifier. Compared with the traditional active+active or active+passive double conversion mode, the present invention omits intermediate-stage active circuits and filtering circuits, thereby saving power consumption and layout area, and realizing sufficient rejection on an image signal while ensuring a high conversion gain.