balanced output line driver and cmrr??

matthias · Nov 14, 2005

just found a great output-stage schematic,
but I don't know how to deal with the cmrr trimmer and the TBD resistor..

http://www.forsselltech.com/schematics/BalOut1.pdf

how can I measure cmrr..?? and what resistor/trimmer values would you suggest...

thank you...

mat

moamps · Nov 14, 2005

[quote author="matthias"].....
how can I measure cmrr..?? [/quote]
Connect both inputs together and apply sine signal.
Measure signal on each output and set them to minimum (zero).
Check and measure CMRR on few frequencies (for example 100Hz, 1k, 10k)

and what resistor/trimmer values would you suggest..

Combination 1k + 10k trimmer looks good to me.

Regards,
Milan

martingriffith · Nov 14, 2005

I think this is a better BalOP stage, done/designed by Barry Porter when he was at Drakes.
Sorry if its not a neat diagram, did it in a hurry, long time ago, never got around to tarting it up

martingriffith · Nov 14, 2005

Damn

http://uk.geocities.com/martingriffith/BALOP.PDF

PRR · Nov 14, 2005

> how to deal with the cmrr trimmer

Why do you even care about high CMRR on a driver?

clintrubber · Mar 22, 2006

[quote author="martingriffith"]I think this is a better BalOP stage, done/designed by Barry Porter when he was at Drakes.

http://uk.geocities.com/martingriffith/BALOP.PDF
[/quote]
Just curious, better in which respect ?

Sorry if its not a neat diagram, did it in a hurry, long time ago, never got around to tarting it up

Never mind :wink: :
http://www.wavefront.mcmail.com/balop.pdf

balanced output line driver and cmrr??

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balanced output line driver and cmrr??

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