NEC PD17062 Manual do Utilizador descarregar pdf (Página 226)

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PD17062

18.5.2 Functions of the Phase Comparator (

-DET)

As shown in Fig. 18-5, the phase comparator compares the phase of the output frequency “f

N” of the

programmable divider (PD) and the phase of the reference frequency “f

r”, and outputs the up request signal

(UP) or down request signal (DW).

If the divider output frequency fN is lower than the reference frequency fr, the phase comparator outputs

an up request. If f

N is higher than fr, the phase comparator outputs a down request.

Fig. 18-6 shows the relationship among the reference frequency f

r, divider output frequency fN, up request

UP, and down request DW.

In the PLL disable mode, neither up nor down request is output.

The up and down requests are directed to the charge pump and unlock detection block.

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