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5. UNIQUE SLEW PHASE LOCK LOOP (S-PLL) A unique feature of the GS1522 is the innovative slew phase lock loop (S-PLL). When a step phase change is applied to the PLL, the output phase gains constant rate of change with respect to time. This behavior is termed slew. Figure 14 shows an example of input and output phase variation over time for slew and linear (conventional) PLLs. Since the slewing is a non-linear behavior, the small signal analysis cannot be done in the same way as it is done for the standard PLL. However, it is still possible to plot input jitter transfer characteristics at a constant input jitter modulation.