[SI-LIST] Re: Loop filter
- From: Ray Anderson <ray.anderson@xxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Thu, 23 Jun 2011 15:07:40 -0700
Roy-
Since you're using Hittite parts why don't you try their online PLL
calculator app for assistance in designing the loop filter and analyzing
the loop dynamics:
http://www.hittite.com/tools/PLLCalc/PLLCalc.htm
-Ray Anderson
Xilinx Inc.
On 6/23/2011 1:25 PM, Roy M wrote:
> Hey experts,
> I'm desiging a synthesizer for RF mixer using Hittite components.
Although
> it's RF related, it's actually a filter question (maybe some RF guys
can
> help me too?).
> The loop filter is used to determine the Vtune for the synthesizer
(among
> other things).
> I've attached a pdf of the schematic of the loop filter. It's design
is
> given by Hittite.
> I need some help regarding on how to analyze this filter. The problem
is the
> filter output is 15v fix. I guess there's a problem with its feedback
(?)
> which causes the op amp filter to go to highest possible value - but
I'm not
> sure on that.
> I want to find its transfer function, and thru that - to find out what
is
> wrong.
> Anyway, Given the values of C and R how do I start anaylizing this
circuit?
> I have some knowledge regarding op amps, but not so much about filters
based
> op amps.
> Can anyone explain to me in short (or long ;o))) how do I anaylze it?
> Thanks,
> Roy
>
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