Leon,
Which Racal did you work for? I have a few RA6830s in the shack with the
RA019 fractional n lsi chip. Works well. 1 MHz. into the phase detector.
Frank WA1GFZ
Leon Heller <[EMAIL PROTECTED]> wrote:
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[email protected]>
Cc: <[EMAIL PROTECTED]>
Sent: Sunday, June 11, 2006 10:16 AM
Subject: Re: [soft_radio] Re: A/D Idea - New proposal for PLL to replace DDS
> Jean-Claude PJ2BVU
>
> The transformers may go either before the Op Amps or after.
>
> The vco of the Huff & Puff can be thermally corrected via a new circuit.
> Also there is a design said to be capable of 10 Hz steps so that is a very
> small step correction and it sounds good.
If a step-up transtormer before the op amps is used for impedance matching,
it can improve the noise performance a lot.
I used to work for Racal, they used fractional N synthesisers. It was a very
clever design, but I've forgotten the details. It could easily be
implemented in a CPLD these days. They put it into an ASIC.
Leon
Leon
[Non-text portions of this message have been removed]
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