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Journal of the Korea Institute of Military Science and Technology 2010;13(6):1058-1063.
Implementation of Self-frequency Synchronizing Circuit using Single-sideband Up-converter and Image Rejection Mixer
Seong-Hyeon Yeom, Tae-Young Kim, Tae-Hyun Kim, Boem-June Park
1LICT
2SamsungThales
3
단측파대 상향변환기와 이미지제거 혼합기를 이용한 자기동조회로의 구현
염성현, 김태영, 김태현, 박범준
1엘아이씨티
2삼성탈레스
3국방과학연구소
Abstract
In this paper, we designed self-frequency synchronizing circuit using image rejection mixer(IRM) and single-sideband(SSB) up-converter which can effectively eliminate the image frequencies occurred in multi-channel super-heterodyne receivers and help us to match inter-channel phase. Also the self-frequency synchronizing circuit simplifies system because there need no extra devices for making intermediate frequency(IF) by creating the local signal within several nanoseconds by means of generating the same frequency of IF signal and modulating radio frequency(RF) signal. We adopt the limiting amplifier for the purpose of protecting the circuit from spurious signals which come from the front end side having wide instantaneous bandwidth characteristics and constantly injecting same level into the input local signal of IRM. The IRM we fabricated has image rejection ratio of 27dB, which is good over 7dB for foreign company's. Also, the SSB up-converter we fabricated has 1dB compression point of 18dBm, which is good over 16dB for foreign company's. And the size is compact about one-forth.
Key Words: Self-frequency Synchronizing, Image Rejection, Single-sideband
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