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Re: Stablizing Ldmos with K <1
Resistor inductor and Capacitor (from gate to gnd) generally i used with this as band stop filter to reject low freq, for example 100MHz
Believe me I do designed also a lot of this, mostly for amplifiers, dummy loads and so on. I used to work with : FR4; Rogers 6010, 5880, 4350; Taconic CER10, etc
First I saw this affect at R6010 (by mistake)...
Not correct
If u looking at simulators like: ADS, AWR etc, so u right
BUT in real live take and perform measurements (before and after removing the resistor) with network and u will see that RL at output side will be practically the same , with small degradation
1. u can use resistors for high temp for example:
www.ims-resistors.com/resistors.html
2. if u can't use with resistor because of your layout, than the only problem that u will have not isolation... IL, RL at all ports will be the same.
Looking at the diagram I dont see something that change except to the gain of amplifiers...
And like tony said above u can just to change to newer components like he suggest...
I really dont understand what is your question...
Hi
According to u schematic
U inject from two different modems to two different upconvetrers...
and then u taking it to amp thru combiner...
Once again I am pretty sure that u problem that fundamental of both modems are not syncronized...
David
Try to take fundamental freq from one of the upconverters and inject it to the other as fundamental (disable the internal one and the second unit)
and than retest...
David
Hi
Lets do example take u Power combiner and 2 different Signal generator
Define both of them (Signal gen) same freq and same power 0 dBm for example and 1GHz
Connect both signal to input of the combiner and sum port to Spectrum analyzer...
The results that u will see that signal will jump...
Did the both upconverters using with same freq oscillator (TCXO etc)
if not please syncrosize them...
If I understand your problem correctly u connect two "different" signals into the combiner by different I mean they dont have same phase...
David
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