A low reference spur quadrature phase-locked loop for UWB systems |
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| Authors: | Fu Haipeng Cai Deyun Ren Junyan Li Wei Li Ning |
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| Institution: | 1. State Key Laboratory of ASIC & System, Fudan University, Shanghai 201203, China
2. State Key Laboratory of ASIC & System, Fudan University, Shanghai 201203, China;Micro-/Nano-Electronics Science and Technology Innovation Platform, Fudan University, Shanghai 201203, China |
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| Abstract: | This paper presents a low phase noise and low reference spur quadrature phase-locked loop(QPLL) circuit that is implemented as a part of a frequency synthesizer for China UWB standard systems.A glitch-suppressed charge pump(CP) is employed for reference spur reduction.By forcing the phase frequency detector and CP to operate in a linear region of its transfer function,the linearity of the QPLL is further improved.With the proposed series-quadrature voltage-controlled oscillator,the phase accuracy of the QPL... |
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| Keywords: | QPLL charge pump UWB glitch S-QVCO |
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