----- 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 ------------------------ Yahoo! Groups Sponsor --------------------~--> Everything you need is one click away. Make Yahoo! your home page now. http://us.click.yahoo.com/AHchtC/4FxNAA/yQLSAA/ELTolB/TM --------------------------------------------------------------------~-> Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/soft_radio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
