公开(公告)号：US20190165729A1

公开(公告)日：2019-05-30

申请号：US15825173

申请日：2017-11-29

Applicant: NATIONAL CHUNG SHAN INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： HSIAO-CHIN CHEN ,  YEN-TING CHIANG ,  CHIEN-TE YU

IPC: H03B5/12 ,  H03L7/093 ,  H03D7/14 ,  H04L27/00

CPC classification number: H03B5/1212 ,  H03B5/1218 ,  H03B5/1228 ,  H03B5/1265 ,  H03B5/1296 ,  H03B27/00 ,  H03B2200/0074 ,  H03B2200/0078 ,  H03B2200/009 ,  H03D7/1425 ,  H03L7/093 ,  H04L27/0014 ,  H04L2027/0016

Abstract: A transformer feed-back quadrature voltage controlled oscillator (QVCO) includes a first VCO; a second VCO; and a dynamic phase error correction circuit, having a plurality of coupling capacitors connected between the first and second VCOs, wherein the capacitances of the coupling capacitors are varied according to a digital control signal to correct a phase error of local oscillating (LO) signals of quadrature phases output by the first and second VCOs.