Rectify 500MHz Small Signal
in [Design]
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From: Jim Thompson on 25 Sep 2009 12:13 Anyone have clever ideas for rectifying a 500MHz sine wave, amplitude say 50mV to 500mV peak-to-peak? Half wave is OK. 1mV accuracy is needed :-( Process is X-Fab XB06. Thanks! ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
From: langwadt on 25 Sep 2009 12:37 On 25 Sep., 18:13, Jim Thompson <To-Email-Use-The-Envelope-I...(a)My-Web- Site.com> wrote: > Anyone have clever ideas for rectifying a 500MHz sine wave, amplitude > say 50mV to 500mV peak-to-peak? > > Half wave is OK. > > 1mV accuracy is needed :-( > > Process is X-Fab XB06. > > Thanks! > how is it normally done? input squared with muliplier and then a squareroot ? muliplier with input and input amplified+limited? -Lasse
From: Jean-Christophe on 25 Sep 2009 13:29 On 25 sep, 17:13, Jim Thompson : > Anyone have clever ideas for rectifying a 500MHz sine wave, > amplitude say 50mV to 500mV peak-to-peak? > Half wave is OK. 1mV accuracy is needed :-( If you need accuracy you may use a large bandwidth AOP for this. I guess that a diode would introduce more than 1 mV error here.
From: Tim Williams on 25 Sep 2009 13:30 On Sep 25, 11:13 am, Jim Thompson <To-Email-Use-The-Envelope-I...(a)My- Web-Site.com> wrote: > Anyone have clever ideas for rectifying a 500MHz sine wave, amplitude > say 50mV to 500mV peak-to-peak? > > Half wave is OK. > > 1mV accuracy is needed :-( > > Process is X-Fab XB06. Can you fab a 6AL5 on that process? ;-) Tim
From: Joerg on 25 Sep 2009 16:41
Jim Thompson wrote: > Anyone have clever ideas for rectifying a 500MHz sine wave, amplitude > say 50mV to 500mV peak-to-peak? > Only 40dB dynamic range, that's easy. 500MHz is going to be the not so easy part. > Half wave is OK. > > 1mV accuracy is needed :-( > > Process is X-Fab XB06. > It's been almost 20 years since I did this (in hardware though) and I don't know the X-Fab process, but have you thought about successive detectors similar to what you'd find in a log amp chip? Basically a bunch of gain stages that each cover a small sliver of the dynamic range and then saturate, with the grand total being the summed outputs. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM. |