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This paper proposes a novel charge pump (CP) circuit and a gated-offset linearization technique to improve the performance of a delta-sigma (????) fractional-N PLL. The proposed CP circuit achieves good up/down current matching, while the proposed linearization method enables the PFD/CP system to operate at an improved linear region. The proposed techniques are demonstrated in the design of a 2.4-GHz...
This paper reports a PFD/CP linearization technique and a new charge pump circuit to enhance the performance of a delta-sigma (DeltaSigma) fractional-N PLL. The proposed method improves the PLL linearity by forcing the PFD/CP to operate in a linear part of its transfer characteristic; while the CP circuit minimizes the current mismatch between the up and down currents by feedback. These circuit techniques...
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