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In phase-locked loop (PLL), the loop parameters such as loop bandwidth, phase margin and damping factor must be adjusted to minimize jitter and to guarantee stability. According to the restrictions of the PLL, this paper employs formula derives to find the relationship between the loop parameters. Therefore, the PLL uses time-to-digital converter (TDC) and programmable current mirror (PCM) to adjust...
An adaptive bandwidth phase-locked loop (PLL) uses a switched-capacitor equivalent resistor circuit in the loop filter and a multistage inverse-linear programmable current mirror to bias of the charge pump for not only the proper loop bandwidth but also constant phase margin and are independent of multiplication factor, reference frequency, output frequency, process, voltage and temperature. The charge...
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