The design of high-performance Phase Frequency Detector and Charge Pump based on SMIC 28 nm CMOS process has been achieved in this paper. By using D flip-flop PFD and optimizing structure of the gate
a PFD has been accomplished
which two output had a good matching performance. To obtain a CP with low mismatch current under the larger range of output voltage
source-switch CP structure and an operational amplifier with a rail-to-rail input stage were used.
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references
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