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좁은 채널밴드를 갖는 고성능 Phase-locked loops를 위한 새로운 구조의 Charge pump
정윤웅(Youn-woong Chung),범진욱(Jinwook Burm) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
A new charge pump was designed for narrow band phase-locked loop (PLL). The charge pump is a critical element in narrow channel band spacing PLL. The charge pump controlled by phase frequency detector output provides currents to the load capacitor in loop filter. The conventional charge pump has problems of current mismatch, charge sharing, clock feed through, the leakage current, and AC leakage. This problem is improved by the proposed charge pump. So, high performance narrow band PLL is designed by proposed charge pump.