great explanation ,,,, thank you so much for sharing and pouring your knowledge out for people like use to learn more,,,,, really appreciable ,,, like tiny details
really great depth knowledge , very time i watch it i decode more information ,,,, thank you so much for sharing your great knowledge,,, beautiful sir... i become a fan of u,,,,, if this video were not on youtube ,,,, i would be dumb on class f PA If you have time please make a video on """"DOHERTY POWER AMPLIFIER""""
Great videos, very instructional and useful.. But what is with the extreme compression/limiting used on the audio here? It makes it difficult to listen to.
I don't get at @11:00 when you say "open at third and fifth" when before you set up a finite (200Ohm ) resistance for those current harmonics. With an open how can you define voltage harmonic=current harmonic*R and thus building the square-wave? But at the same time with a finite resistance how are you not dissipating energy at odd harmonics?
Hi Matthew, great work with this tutorial. Can I use this amplifier for boosting digital set top box signal for my tv? It has a frequency range from 100 MHz to 300 MHz.
hello , very helful video thanks a million... dear mathew can you share video about implementing a (cmos)doherty power amp in ADS pleaseeee i search a lot and cant find anything best regards
I have Cree 10W transistor, we don't have access to the current generator plane and internal parasitics, so how can we terminate the harmonics in the packaged plane?
Good questions, Antra. Those lucky enough to have access to tools like ADS or MWO where they work can obtain vendor-supplied behavioral models for those tools which permit access, as it were, to the current & voltage waveforms prior to the intrinsic & package parasitics. For those without ADS access, however, there's still some hope where the CGH40010F is concerned since it has been one of the most used RFPA devices for students for their research and thesis work. There are endless papers & thesis, dissertations which employ this devices online without cost. One of the best, I've found, is King, J.B., & Brazil, T.J., "Nonlinear Electrothermal GaN HEMT Model Applied to High-Efficiency Power Amplifier Design," IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 61, NO. 1, JANUARY 2013. The authors model the CGH40010 quite thoroughly, breaking out all the Angelov model parameters, the nonlinear parameters, such as the all-important Cds, and even model the thermal and dispersion aspects (which account for the GaN charge trapping problem).
Hi. Mathew. I want to optimize my design for 5.8GhZ . How can I change the frequency from 10 GhZ to 5.8GhZ for running the optimization for output harmonic terminations?
You will need to adjust the frequency of the equation based load on the ADS schematic . To do that look for a Var block below the load in schematic and change the rf_freq variable to be 5800 (because this is in MHz). Also you will have to adjust the frequency of the signal source (Port 1) to be 5.8 GHz so that you are driving the device at this frequency (you could just set that to be rf_freq MHz too).
Hello, Thank you for the video. very Useful. I have following question: Class F amplifier uses 3rd and 5th harmonic. I have a non-Linear model of the transistor. Using Loadpull tutorial by Andy Howard I was able to set a load for a fundamental frequency. Can you please suggest how to set loads on 3rd and 5th harmonic? Thank you,
+Michael Adelman In the workspace that comes with this video www.keysight.com/find/eesof-how-to-classf, simply open the design named ‘classf’ and you’ll find an equation based load component which will allow you to specify or sweep the reactance of any of the first 15 harmonics. Type in whatever value of reactance you want.
+Michael Adelman Remember, for a real device, an opencircuit harmonic impedance which is provided externally to the transistor will very likely not be an open circuit inside the transistor due to the effects of the device parasitics. Even if you do see semi-square waveforms externally, you could be operating in some type of Class J mode instead of pure Class F - which could have reliability implications. For more information about Class J and continuous modes of operation, check out this video th-cam.com/video/N0dLVMoVQSI/w-d-xo.html
Thank you, this video that Andy posted is great and very helpful. But, it does not refer to higher harmonic loadpull. Please share much more relevant video, thank you.
+Adrien Azerty In many cases this Inverse F mode of operation is desirable-first for devices with larger on resistance and higher bias voltages, ICF tends to provide superior PAE. Second, open circuit harmonic terminations are easier to realize at lower frequencies so practically speaking, inverse F mode may be realizable higher in frequency. It’s pretty easy in the workspace provided to just flip the impedances to realize Inverse Class F - in other words simply put high impedances in the even harmonics and low impedances in the odd harmonics to square the current waveform and that should allow you play with all the tradeoffs involved.
+Tushar Sharma You will need to update the data display to reflect voltages and currents in whatever device you are using. The device shown in the workspace is meant to illustrate access to the intrinsic current source node - so the voltage (node name) “Vcs” and current probe “Ics” are inside of the device (you can see this by selecting the device named “ideal_device” and pushing the green down arrow in the toolbar - note the current source “Ics” and voltage name “Vcs”). All you need to do is name the output node (perhaps the drain) of your device to “Vcs” using the name button on the toolbar, and place a current source from “Probe Components” palette named “Ics” in series, and your data display will update accordingly.
+Tushar Sharma If you are new to using Keysight ADS, then I would recommend checking out some of our eLearning material here. It's a great place to start! www.keysight.com/main/editorial.jspx?ckey=1800357&id=1800357&lc=eng&cc=US
Hi Mathew, I've downloaded the project files. How do i open it in ADS. I've tried opening it but i keep getting an error "Not a project directory". Please help
rajeev khanna Sure! First you should download a free trial of ADS www.keysight.com/find/eesof-ads-info, then once you are inside the software, there are many examples and tutorials that can guide you through the design files.
F.A.W.K.E.S. The bias is referring to the quiescent DC operating point (DC Voltage and Current) of the transistor when an RF signal is applied. A transistor’s DC voltage is usually set by the power supply, while the DC current depends on the input (control). The RF signals are superimposed on this quiescent bias point. Class F is more of an advanced mode -- for more information on the basic theory behind PA design, check out this video th-cam.com/video/WAingaHfBMs/w-d-xo.html.
WHAT HAPPENS WHEN YOU DONT HAVE ACCESS TO ADS ( SEVERAL TENS OF THOUSANDS OF DOLLARS). I think I liked your dissertation but was disconcerted by your intensive use of ADS, For those of us who cannot afford this tool would you have a intuitive explanation using simpler tools like Excel?
You can always apply for a free trial of ADS here. www.keysight.com/find/mytrial.rfmw.vi Students at participating universities are also eligible for free one-year licenses. www.keysight.com/main/editorial.jspx?cc=US&lc=eng&ckey=1488740&nid=-34360.0.08&id=1488740
Thank you. I must remember my place here. This presentation had a dual purpose I think. One to present the technology and the other to sell the Keysight product. Forgive me for not realizing this earlier. Best regards
great explanation ,,,, thank you so much for sharing and pouring your knowledge out for people like use to learn more,,,,, really appreciable ,,, like tiny details
really very depth and good explanation ,,,, i never thought that much deeper ,,, ,i understood it 6:02 thank you so much
really great depth knowledge , very time i watch it i decode more information ,,,, thank you so much for sharing your great knowledge,,, beautiful sir... i become a fan of u,,,,,
if this video were not on youtube ,,,, i would be dumb on class f PA
If you have time please make a video on """"DOHERTY POWER AMPLIFIER""""
Great videos, very instructional and useful.. But what is with the extreme compression/limiting used on the audio here? It makes it difficult to listen to.
brendan_alw Thanks for the feedback!
I don't get at @11:00 when you say "open at third and fifth" when before you set up a finite (200Ohm ) resistance for those current harmonics. With an open how can you define voltage harmonic=current harmonic*R and thus building the square-wave? But at the same time with a finite resistance how are you not dissipating energy at odd harmonics?
Can you explain the situation of simulation efficiency more than theorical efficiency at 7.50?
Hi. Did you publish the paper that you refer in the video. Is your name Matthew T. Ozalas ?
Hi Matthew, great work with this tutorial. Can I use this amplifier for boosting digital set top box signal for my tv? It has a frequency range from 100 MHz to 300 MHz.
hello ,
very helful video thanks a million...
dear mathew can you share video about implementing a (cmos)doherty power amp in ADS pleaseeee
i search a lot and cant find anything
best regards
I have Cree 10W transistor, we don't have access to the current generator plane and internal parasitics, so how can we terminate the harmonics in the packaged plane?
Good questions, Antra. Those lucky enough to have access to tools like ADS or MWO where they work can obtain vendor-supplied behavioral models for those tools which permit access, as it were, to the current & voltage waveforms prior to the intrinsic & package parasitics. For those without ADS access, however, there's still some hope where the CGH40010F is concerned since it has been one of the most used RFPA devices for students for their research and thesis work. There are endless papers & thesis, dissertations which employ this devices online without cost. One of the best, I've found, is King, J.B., & Brazil, T.J., "Nonlinear Electrothermal GaN HEMT Model
Applied to High-Efficiency Power Amplifier Design," IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 61, NO. 1, JANUARY 2013. The authors model the CGH40010 quite thoroughly, breaking out all the Angelov model parameters, the nonlinear parameters, such as the all-important Cds, and even model the thermal and dispersion aspects (which account for the GaN charge trapping problem).
6:02 i did not get the point ,,,, how exactly the device turned off for large input
Thanks you sir.... i Learned it
Hi. Mathew. I want to optimize my design for 5.8GhZ . How can I change the frequency from 10 GhZ to 5.8GhZ for running the optimization for output harmonic terminations?
You will need to adjust the frequency of the equation based
load on the ADS schematic . To do that look for a Var block below the
load in schematic and change the rf_freq variable to be 5800 (because this is
in MHz). Also you will have to adjust the frequency of the signal source
(Port 1) to be 5.8 GHz so that you are driving the device at this frequency
(you could just set that to be rf_freq MHz too).
Hello,
Thank you for the video. very Useful.
I have following question:
Class F amplifier uses 3rd and 5th harmonic.
I have a non-Linear model of the transistor. Using Loadpull tutorial by Andy Howard I was able to set a load for a fundamental frequency.
Can you please suggest how to set loads on 3rd and 5th harmonic?
Thank you,
+Michael Adelman In the workspace that comes with this video www.keysight.com/find/eesof-how-to-classf, simply open the design named ‘classf’ and you’ll find an equation based load component which will allow you to specify or sweep the reactance of any of the first 15 harmonics. Type in whatever value of reactance you want.
+Michael Adelman Remember, for a real device, an opencircuit harmonic impedance which is provided externally to the transistor will very likely not be an open circuit inside the transistor due to the effects of the device parasitics. Even if you do see semi-square waveforms externally, you could be operating in some type of Class J mode instead of pure Class F - which could have reliability implications.
For more information about Class J and continuous modes of operation, check out this video th-cam.com/video/N0dLVMoVQSI/w-d-xo.html
+Michael Adelman By the way, Andy has posted an excellent video on How to Run a Loadpull Simulation here th-cam.com/video/34N-r5rPSzU/w-d-xo.html
Thank you, this video that Andy posted is great and very helpful. But, it does not refer to higher harmonic loadpull.
Please share much more relevant video, thank you.
Thank you for this great educational video ! Per chance, do you plan to do one for inverse class F ?
+Adrien Azerty In many cases this Inverse F mode of operation is desirable-first for devices with larger on resistance and higher bias voltages, ICF tends
to provide superior PAE. Second, open circuit harmonic terminations are
easier to realize at lower frequencies so practically speaking, inverse F mode
may be realizable higher in frequency. It’s pretty easy in the
workspace provided to just flip the impedances to realize Inverse Class F - in
other words simply put high impedances in the even harmonics and low impedances
in the odd harmonics to square the current waveform and that should allow you
play with all the tradeoffs involved.
When I replace my device with a real device the data display shows an error. Why is it so?
+Tushar Sharma
You will need to update the data display to reflect voltages and currents in whatever device you are using. The device shown in the workspace is meant to illustrate
access to the intrinsic current source node - so the voltage (node name) “Vcs”
and current probe “Ics” are inside of the device (you can see this by selecting
the device named “ideal_device” and pushing the green down arrow in the toolbar
- note the current source “Ics” and voltage name “Vcs”). All you need to
do is name the output node (perhaps the drain) of your device to “Vcs” using
the name button on the toolbar, and place a current source from “Probe
Components” palette named “Ics” in series, and your data display will update
accordingly.
+Tushar Sharma If you are new to using Keysight ADS, then I would recommend checking out some of our eLearning material here. It's a great place to start! www.keysight.com/main/editorial.jspx?ckey=1800357&id=1800357&lc=eng&cc=US
what is the frequency range? any one can explain
Hi Mathew,
I've downloaded the project files. How do i open it in ADS. I've tried opening it but i keep getting an error "Not a project directory". Please help
Hi need to unzip the downloaded file and then select open workplace
select that folder
Thank you for sharing this video. I downloaded the file but I am not sure how to use it. Can you help?
rajeev khanna Sure! First you should download a free trial of ADS www.keysight.com/find/eesof-ads-info, then once you are inside the software, there are many examples and tutorials that can guide you through the design files.
Dear, Does the download link still take effect? there is no response to my submission.
OK, no problem, just waiting a little longer time. Thank you very much!
I am not sure what does the bias mean when you are defining the basic theory of PA amplifier operation.
F.A.W.K.E.S. The bias is referring to the quiescent DC operating point (DC Voltage and Current) of the transistor when an RF signal is applied. A transistor’s DC voltage is usually set by the power supply, while the DC current depends on the input (control). The RF signals are superimposed on this quiescent bias point. Class F is more of an advanced mode -- for more information on the basic theory behind PA design, check out this video th-cam.com/video/WAingaHfBMs/w-d-xo.html.
WHAT HAPPENS WHEN YOU DONT HAVE ACCESS TO ADS ( SEVERAL TENS OF THOUSANDS OF DOLLARS). I think I liked your dissertation but was disconcerted by your intensive use of ADS, For those of us who cannot afford this tool would you have a intuitive explanation using simpler tools like Excel?
You can always apply for a free trial of ADS here. www.keysight.com/find/mytrial.rfmw.vi Students at participating universities are also eligible for free one-year licenses. www.keysight.com/main/editorial.jspx?cc=US&lc=eng&ckey=1488740&nid=-34360.0.08&id=1488740
Thank you. I must remember my place here. This presentation had a dual purpose I think. One to present the technology and the other to sell the Keysight product. Forgive me for not realizing this earlier. Best regards
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