Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would
be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate
that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views.
It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if
you would like to post something on RF Cafe's
page, please do.
Below are all of the forum threads, including all
the responses to the original posts.
Post subject: Regarding AGC!! Posted: Tue Jul 26, 2005 6:19 am
Tue Jul 26, 2005 5:55 am
I am building a 822Mhz Transceiver, and with a receiver
IF = 90Mhz.
I use a pin variable attenuator provided by agilent after my first IF stage.
is the attenuation is logrithmatic and the control voltage is
linear, this leave me a non-linear output gain
even it is within some
Therefore, I wondering if there are any method can solve this
problem other than using a expensive log amplifier?
Thank you for helpping me out
Post subject: Posted: Tue Jul 26, 2005 6:33 am
Mon Jun 27, 2005 2:02 pm
If I understood correctly your
problem, then one possible solution would be to convert the linear voltage into its logarithmic value. This can be
done by means of a logarithmic amplifier - a simple circuit made of operational amplifier with diode in the
A more advanced version:
Posted: Tue Jul 26, 2005 7:29 am
Joined: Tue Jul 26, 2005 5:55 am
Thank you so much, these circuits are indeed quite nice.
All the best.