Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!pasteur!ucbvax!hplabs!hpl-opus!jewett
From: jewett@hpl-opus.HP.COM (Bob Jewett)
Newsgroups: sci.electronics
Subject: Re: frequency synthesizer
Message-ID: <65200006@hpl-opus.HP.COM>
Date: 22 Aug 89 18:23:15 GMT
References: <535@focsys.UUCP>
Organization: HP Labs, High Speed Electronics Dept., Palo Alto, CA
Lines: 19

> I want to put together a frequency synthesizer (square wave)
> that can adjust between 1 and 10 MHz with 255 steps (ie. 35k Hz
> per step).

Frequency synthesizers have lots of other specs that you don't mention,
such as jitter (phase noise), tuning speed, phase windup, ...

> The PLL's I've looked at don't have the range, synthesizers
> don't have the speed (500k Hz max.)

The PLL only needs an octave of tuning range.  Get the rest with a selectable
number of binary dividers on the output.

> Ideas???

For ideas, I'd go for maintenance manuals of commercial frequency
synthesizers.

Bob