Page 211 - Phase-Locked Loops Design, Simulation, and Applications
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MIXED-SIGNAL PLL APPLICATIONS PART 1: INTEGER-N FREQUENCY
SYNTHESIZERS Ronald E. Best 129
Figure 6.9 Characteristic of the VCO for the CMOS IC type 74HC/HCT4046.
6
−1 −1
a few Hertz. From this characteristic, the VCO gain becomes K = 2.24 · 10 rad s V .
0
Following the rules indicated in the data sheet, resistors R , R , and capacitor C (Fig. 6.10)
1
2
1
are found from graphs. The resistors must be chosen to be in the range of 3 to 300 kΩ. The
parallel connection of R and R should furthermore yield an equivalent resistance of more
1 2
than 2.7 kΩ. We thus obtain
