Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Low Frequency PLL Multiplier

For a video genlocking application I need to multiply an incoming ~15KHZ clock by ~2000 to produce ~30MHZ. The input frequency is too low for the PLLs in my Cyclone III and I've been straining my br...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Depends on your requirements for the 30 MHz clock. If you can accept larger jitter for it, a regular all-digital PLL can be solution. Alternatively, a quasi-continuous digital PLL (jitter < 0.5 ns) can be build using the PLL dynamic phase shift feature, but the lock range will be limited.