Re: Pulse Multiplier

--- In CAD_CAM_EDM_DRO@egroups.com, Alan Marconett KM6VV <KM6VV@a...>
wrote:

> Mariss,
>
> That sounds like a lot of work! PLL's (Phase Locked Loop) are used

in

> RF work quite a lot, I wonder if a VCO, PLL and programmable divider
> could work in this application? Perhaps the PLL would not have

enough

> range?

Alan,

You are right. A generic PLL phase detector has a pull-in range of +/-
90 deg. A 4-bit counter/summer extends this to +/- 8 X 360 deg or
2,880 degrees.

Second, the VCO in PLLs is linear. Even if its range is 1:10,000
(unlikely) the noise (phase jitter) at low frequencies would make it
unacceptable.

Finally if a PLL outputs a few pulses too few or too many, nobody
cares. That's not the case with motion control.

Mariss