公开(公告)号：US20230112914A1

公开(公告)日：2023-04-13

申请号：US17563257

申请日：2021-12-28

Applicant: Korea Electronics Technology Institute

Inventor： Ki Jin KIM ,  Kwang Ho AHN ,  Soo Chang CHAE

IPC: H01P1/38 ,  H04B1/40 ,  H03F3/19

Abstract: There is provided a quasi-circulator. The quasi-circulator includes: a first coupler having an input end connected to a transmission end; a first amplifier having an input end connected to an output end of the first coupler; a second amplifier having an input end connected to the output end of the first coupler; a second coupler having one end connected to an output end of the first amplifier and an output end of the second amplifier, and the other end connected to an antenna; and a third coupler having one end connected to the output end of the first amplifier and the output end of the second amplifier, and the other end connected to a reception end. Accordingly, a loss occurring at the quasi-circulator is minimized, and eventually, efficiency of an RF FEM employed in an ultrahigh frequency radar system is enhanced.

公开(公告)号：US20220271749A1

公开(公告)日：2022-08-25

申请号：US17623040

申请日：2019-12-12

Applicant: Korea Electronics Technology Institute

Inventor： Ki Jin KIM ,  Kwang Ho AHN ,  Soo Chang CHAE

IPC: H03K17/693 ,  H03K17/687

Abstract: Provided is a switch having a structure having an excellent isolation characteristic even without a limiter in an ultrahigh frequency hand used for a military component. A switch according to an embodiment of the present invention comprises: multiple transistors which are connected in parallel to a path from an input terminal toward an output terminal and perform switching; and a first transmission line provided between the input terminal and a node on a path to which a first transistor is connected. By the present invention, switching can be performed in an ultrahigh frequency such as W-band while a GaN transistor is used, an insertion loss is low, an isolation characteristic is excellent, and eventually efficiency of an ultrahigh frequency circuit can be further enhanced.

公开(公告)号：US20170237402A1

公开(公告)日：2017-08-17

申请号：US15391500

申请日：2016-12-27

Applicant: Korea Electronics Technology Institute

Inventor： Ki Jin KIM ,  Kwang Ho AHAN

IPC: H03F1/22 ,  H03F3/193

CPC classification number: H03F1/223 ,  H03F1/347 ,  H03F3/193 ,  H03F2200/405 ,  H03F2200/451 ,  H03F2200/537

Abstract: An RF amplifier to increase a gain using a transformer is provided. The amplifier includes: a first transistor configured to generate a current by amplifying and converting an input voltage; a second transistor configured to amplify the generated current; and a first transformer configured to feed an emitter current of the second transistor back to a gate. Accordingly, Gm of the transistor is boosted using the transformer, such that a high gain can be obtained with a low current. Therefore, a problem of a gain reduction caused by a parasitic capacitor at a high frequency can be solved.

公开(公告)号：US20140312933A1

公开(公告)日：2014-10-23

申请号：US14256356

申请日：2014-04-18

Applicant: KOREA ELECTRONICS TECHNOLOGY INSTITUTE

Inventor： Sang Hoon PARK ,  Kwang Ho AHN ,  Ki Jin KIM

IPC: H03K5/1252

CPC classification number: H03K5/249

Abstract: A low noise comparator for a high resolution ADC is provided. The comparator includes: an inputter configured to receive a signal and amplify the signal; and an outputter configured to output a result of comparing the signal output from the inputter, wherein an inductor is connected to an input terminal of an input element of at least one of the inputter and the outputter. Accordingly, the comparator can satisfy the gain value and the noise performance at the same time by using the inductor which has no voltage headroom problem.

Abstract translation: 提供了一个用于高分辨率ADC的低噪声比较器。 比较器包括：输入器，被配置为接收信号并放大信号; 以及输出器，被配置为输出比较从输入器输出的信号的结果，其中电感器连接到输入器和输出器中的至少一个的输入元件的输入端子。 因此，比较器可以通过使用没有电压余量问题的电感器同时满足增益值和噪声性能。