【Key words】 frequency synthesizer； loop stability； phase noise； parameter design； equivalent noise model； noise estimation； differential charge pump； differential VCO； frequency divider； stability optimization； stability compensation； noise optimization；
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全差分电荷泵 fully differential charge pump
提出了一种应用于频率综合器的全差分电荷泵电路。
A fully differential charge pump for a frequency synthesizer is proposed.
采用差分输入和差分输出方案，设计了一种新型的全差分电荷泵。
A new novel fully-differential charge pump was designed in this paper, differential input and differential output was used in this circuit.
简要讨论了电荷泵中的非线性问题及常用的一些结构，提出了一种改进的基于负反馈的全差分电荷泵结构。
The nonlinearities and some general structures of charge pump are briefly discussed in the paper. An improved differential charge pump based on negative feedback is then presented.
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