公开(公告)号：US20200230648A1

公开(公告)日：2020-07-23

申请号：US16747197

申请日：2020-01-20

Applicant: STMicroelectronics S.r.I.

Inventor： Andrea Barbieri ,  Aldo Vidoni

IPC: B06B1/02 ,  B06B1/06 ,  H03F3/45

Abstract: A negative impedance circuit includes: a differential circuit stage; a positive feedback path from an output of the differential circuit stage to a first input of the differential circuit stage; and a negative feedback path from the output of the differential circuit stage to a second input of the differential circuit stage. The negative feedback path includes a first transistor, and a unitary gain path from the output of the differential circuit stage to the second input of the differential circuit stage, the unitary gain path coupled to ground via a reference impedance. The positive feedback path includes a second transistor. The first and second transistors are coupled in a current mirror arrangement and have respective control electrodes configured to be driven by the output of the differential circuit stage, where the negative impedance circuit causes a negative impedance at the first input of the differential circuit stage.