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To improve the PAE a power amplifier,
some paper indictate that for output matching
the second harmonic should be short
but some parper say it should be open.
Can anybody give a clue what make the difference?
Thanks
Dear,
I am planning to use Johanson technology's 0603 S-series caps for the power amplifier matching networks. So the phase of the caps is important to me.
According to the Johanson website, the S-parameter downloaded from the website has de-embedded the physical length of the caps, so in...
In ads mirocstrip option it contains MLEF and MLOC.
What are the difference. If I use open stub for the mathing network which one should i choose?
Thanks in advance.
microstrip line ground plane
I saw some Power amplifier design use microstip line with ground plane on the top, which look like a coplanar waveguide.
I am wonder how to difine the miminum distance between ground plane and line to make sure it is a microstrip line?
Thanks in advance
I did not use any design package.
I make my PA deisgn in ADS, and to stablize the device I need to sold the SMD like above.
The design I use is FR4 microstrip and want to sold this component on top.
Let me know if it is still unclear.
Thanks
how to make an smd pad
I want to make an 1.5pF Capacitor in series with a 4nH Inductor and then
the C+L in parallel with a Resistor.
I am wondering how to make the pad design for this three SMD compnent?
Thanks in advance.
I find a paper (please see attached) which describes a 200W power amplifier design.
The paper mentioned it use two-stages matching circuits consists of a quarter wavelength microstrip line impedance-transformer.
But I can not understand the matching network.
Why there is a slot at input...
The Power added efficiency (PAE) is defined as
PAE=(Pout-Pin)/Pdc.
Pout and Pin are at fundamental freuquency.
Pdc is the DC dissipated power.
The definition of power effiency (η) is
η = Pout/Pin.
That is really interesting and indeed ture, which I never think about it in detail. Thanks a lot.
Many text books mention for power amlifier design: the output is matched at optimized load from loadpull measurement and the input is designed to be conjugated matched. So I took it for granted...
Many thanks for the explainations.
In conclusion, does it mean there shall be no difference in case both two configurations can be used?
However, the paper I had (see attached) mentioned with internal matching the output power increased.
if the measurement plane are following:
without...
For power amplifer input matching, does it matter to put the bias network closer to the device or put the matching network closer to the device?.
I mean seen from the input the sequency is
INPUT+BIAS NETWORK+MATCHING NETWORK+DEVICE
or
INPUT+MATCHING NETWORK+BIAS NETWORK +DEVICE
I find...
I want to design a PA at 4 GHz and would like to know what should be the minimum ft and fmax of the device.
what will be the influence if a device has fmax low than ft.
Thanks in advance
I am little bit confused about the influence of CPW substrate thickness h on line loss.
I read from some paper that say the h should be larger thant W+2S to reduce the interactive between surface wave mode and CPW mode.
But on the other hand the h should be smaller than the 0.1 lambda (in...
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