公开(公告)号：US20190173425A1

公开(公告)日：2019-06-06

申请号：US16158352

申请日：2018-10-12

Applicant: Electronics and Telecommunications Research Institute

Inventor： Seong Mo MOON ,  In Bok YOM

IPC: H03B5/12 ,  H03K3/03

Abstract: Disclosed is a wide band frequency oscillator circuit and oscillation method using a ring voltage-controlled oscillator (VCO). The frequency oscillator circuit includes a low drop-out (LDO) regulator configured to generate an input voltage of a ring VCO, and the ring VCO connected to the LDO regulator and configured to control an oscillation frequency based on the input voltage, wherein the LDO regulator includes a feedback adjustable resistor.

公开(公告)号：US20180108963A1

公开(公告)日：2018-04-19

申请号：US15462000

申请日：2017-03-17

Applicant: Electronics and Telecommunications Research Institute

Inventor： Seong Mo MOON ,  In Bok YOM ,  Moon-Que LEE

IPC: H01P1/201 ,  H01P5/12 ,  H01P1/18 ,  H01P1/22

CPC classification number: H01P1/201 ,  H01P1/00 ,  H01P1/18 ,  H01P1/22 ,  H01P5/12 ,  H03H7/00

Abstract: Provided is a microwave filter system having a feedback structure. The microwave filter system may include an input hybrid coupler configured to output first output signals having a phase difference with respect to an input signal; filters disposed to be in parallel with an output end of the input hybrid coupler, and configured to filter the first output signals; and an output hybrid coupler configured to output second output signals having a phase difference with respect to each of signals filtered through the filters. An output signal of the output hybrid coupler is applied to an input end of the input hybrid coupler along a feedback path.

公开(公告)号：US20170141763A1

公开(公告)日：2017-05-18

申请号：US15298538

申请日：2016-10-20

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Seong Mo MOON ,  In Bok YOM

IPC: H03K3/013 ,  H03G1/00 ,  H03K5/00

CPC classification number: H03K3/013 ,  H03G1/0029 ,  H03G3/3052 ,  H03K5/00006

Abstract: Disclosed is a frequency doubler which controls a magnitude of a signal supplied to a virtual ground by adjusting a gain of one-side transistor among transistors receiving differential input signals when outputting a frequency multiplied LO signal through the virtual ground by amplifying the input differential signals by using a differential circuit structure to minimize undesired harmonics characteristics in a frequency doubled signal output by making the magnitudes of two differential signals be the same as each other.

公开(公告)号：US20170093384A1

公开(公告)日：2017-03-30

申请号：US15214738

申请日：2016-07-20

Applicant: Electronics and Telecommunications Research Institute

Inventor： Dong Hwan SHIN ,  Seong Mo MOON ,  In Bok YOM ,  Dong Pil CHANG ,  Jin Cheol JEONG

IPC: H03K5/134

CPC classification number: H03K5/134 ,  H03K2005/00195

Abstract: Provided is an active true time delay apparatus for delaying a time and producing a gain in a superhigh frequency band using a field effect transistor (FET) and a similar semiconductor device. The active true time delay apparatus may include a delayer configured to delay an input signal for a predetermined length of time using at least one FET element connected in a distributed amplifier structure and an outputter configured to output the delayed input signal, and the delayer is disposed on a transmission line between an inputter and the outputter.