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peter_scott · 22nd Apr 2004, 11:55 am

Hi Jeffrey,

Thanks for your help and encouragement.

I started with the intention of using the 4053 for the output video switching and then decided to try my luck at mopping up the clock switching in the same device. (Probably a bit too ambitious). In practice the CXLs need emitter follower buffering so I had virtually included half of Darius' discrete analogue switch anyway. Given the crosstalk problems I decided to continue using the 4053 for the clock switching and revert to Darius' video switch. The CXLs are quite sensitive to clock amplitude and offset so I had thought of using the third 4053 switch to supply dummy loads in the way you suggested
but I think Darius is getting better performance from his logic selection of CXL clocks so I may abandon my clock selection and try your approach for the video switch.

I am using the phase/frequency PSD (PC2) in the 4046. I hadn't given any thought to the crossover region but I might take a look at that. Thanks for the suggestion.

My schematic is not quite up to date but you will get an idea of it at http://www.scottpeter.pwp.blueyonder.../Schematic.jpg

This is equivalent to Darius' Blatt 4.5 and 10

Thanks again for the pointers. Any other suggestions are most welcome.

Peter.

p.s. Period picture http://www.scottpeter.pwp.blueyonder.co.uk/AP10.jpg

22nd Apr 2004, 11:55 am	#3
peter_scott Dekatron Join Date: May 2003 Location: Edinburgh, UK. Posts: 3,274	Re: Plug for Darius Standards Converter Hi Jeffrey, Thanks for your help and encouragement. I started with the intention of using the 4053 for the output video switching and then decided to try my luck at mopping up the clock switching in the same device. (Probably a bit too ambitious). In practice the CXLs need emitter follower buffering so I had virtually included half of Darius' discrete analogue switch anyway. Given the crosstalk problems I decided to continue using the 4053 for the clock switching and revert to Darius' video switch. The CXLs are quite sensitive to clock amplitude and offset so I had thought of using the third 4053 switch to supply dummy loads in the way you suggested but I think Darius is getting better performance from his logic selection of CXL clocks so I may abandon my clock selection and try your approach for the video switch. I am using the phase/frequency PSD (PC2) in the 4046. I hadn't given any thought to the crossover region but I might take a look at that. Thanks for the suggestion. My schematic is not quite up to date but you will get an idea of it at http://www.scottpeter.pwp.blueyonder.../Schematic.jpg This is equivalent to Darius' Blatt 4.5 and 10 Thanks again for the pointers. Any other suggestions are most welcome. Peter. p.s. Period picture http://www.scottpeter.pwp.blueyonder.co.uk/AP10.jpg Last edited by Paul Stenning; 27th Dec 2004 at 2:29 pm. Reason: Fix link or code for vBulletin