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등록 루프필터 및 이를 포함하는 위상 고정 루프

루프필터 및 이를 포함하는 위상 고정 루프
이미지 확대
발명자
민병훈, 유현규, 이영재
출원번호
12860498 (2010.08.20)
공개번호
20110115535 (2011.05.19)
등록번호
8258832 (2012.09.04)
출원국
미국
협약과제
09MB2200, 차세대 무선 융합 단말용 Advanced Digital RF 기술 개발, 유현규
초록
Provided is a loop filter which receives first and second currents whose current ratio is n (where n is a natural number). The loop filter includes a first-order filter path, a second-order filter path, and a third-order filter path. The first-order filter path includes an operational amplifier generating an output impedance by increasing by as much as n times an impedance of a second input node to which the second current is applied. The first-order filter path performs a first-order filtering on the first current applied to a first input node by using the operational amplifier. The second-order filter path performs a second-order filtering on the first current applied to the first input node. The third-order filter path performs a third-order filtering on the first current applied to the first input node.
KSP 제안 키워드
Current ratio, First-order filter, Operational Amplifiers(Op-Amps), Order filter, Output impedance, Third-order, first-order, loop-filter(LF), phase locked, phase-locked loop(PLL), second-order, second-order filter