公开(公告)号：US10199987B2

公开(公告)日：2019-02-05

申请号：US15776780

申请日：2016-01-29

Applicant: SOUTHEAST UNIVERSITY

Inventor： Chao Chen ,  Jianhui Wu ,  Hong Li ,  Cheng Huang ,  Meng Zhang

IPC: H03D7/14 ,  H03D7/16

Abstract: A self-reconfigurable returnable mixer includes a self-reconfigurable transconductance stage. The input RF voltage signal is converted into RF current through the self-reconfigurable transconductance stage. The RF current is converted into an IF signal through down-conversion and low-pass filtering. The IF signal is fed back to the reconfigurable transconductance stage; the self-reconfigurable transconductance stage presents an open-loop structure to the input RF voltage signal, and the self-reconfigurable transconductance stage presents the topology structure of the negative feedback amplifier to the fed-back IF signal. The self-reconfigurable transconductance stage circuit achieves a high-linearity IF gain while providing a high bandwidth for the RF signal, effectively alleviating the contradiction between the conversion gain and the IF linearity in the conventional returnable structure.

公开(公告)号：US10097223B2

公开(公告)日：2018-10-09

申请号：US15509202

申请日：2016-01-29

Applicant: Southeast University

Inventor： Chao Chen ,  Jianhui Wu ,  Hong Li

IPC: H04B1/26 ,  H04B1/16 ,  H03F3/45

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.