Post dividers (÷ P) are often used to divide a higher VCO frequency down to a useful frequency. Figure 1 – Fractional-N PLL Block Diagram This PLL arrangement is known as an integer PLL and allows a ...

It contains a 1-64 divider at the reference clock input, a 1-256 or larger integer divider and a 1-256 or larger fractional divider in the internal feedback path, with as many as 4 bits of precise ...