50 Threads found on edaboard.com: Power Amplifier And Ads Simulation
usually in power amplifier design u need to use LSSP , which is based on HB simulation , small signal S parameters are not ususally used in PA
also it will be not vaild at all if u design a class C PA
so use HB , or LSSP
RF, Microwave, Antennas and Optics :: 15.08.2006 05:24 :: khouly :: Replies: 3 :: Views: 872
i need a help regarding how to design a 1W power amplifier using ads tools. is there any design example available? and could i design it with small signal S-parameter simulation for its low output power? Or i have to design it with hamonic balance simulation?
pls help (...)
Analog Circuit Design :: 14.08.2006 21:00 :: microwavehongjie :: Replies: 0 :: Views: 794
I designed a power amplifier using ads, and simulated it with Harmonic balance simulator. Since this PA is going to be used in OFDM system, I am looking for a way that simulate it with OFDM input and check the output's shoulder. I really appreciate that if any of you can help me (...)
RF, Microwave, Antennas and Optics :: 03.12.2011 03:13 :: sedighe :: Replies: 2 :: Views: 623
Normally Zload at harmonics should not be this case you'll see total power is lower than delivered power to the load due to harmonics powers.
In ads , there is a good Design Guide for power amplifiers. With this Design Guide , you can simulate your power (...)
RF, Microwave, Antennas and Optics :: 16.06.2003 10:41 :: BigBoss :: Replies: 5 :: Views: 1495
no PSS is not a harmonic balance simulator , it is a steady state time domian simulation , but cadence released a harmonic balance simulation in the new Spectrerf
if u want to use harmonic balanced u can use ads , the harmonic balance engine in ads is very powerfull
RF, Microwave, Antennas and Optics :: 29.05.2007 01:36 :: khouly :: Replies: 10 :: Views: 2312
I find that the input and output waveform become sine wave when I use "Harmonic Balance" to simulate it. I don't know whether is it correct or not ?! and which one of the source , ac voltage source or power source, should I use? Both of them can set the desired freqeuency.
Moreover, in the op-amp parameter setting, I don't know what open (...)
RF, Microwave, Antennas and Optics :: 27.08.2007 10:00 :: Ching :: Replies: 2 :: Views: 1163
yeah , the HB is more robust and converge faster
the HB engine in ads id very powerfull
RF, Microwave, Antennas and Optics :: 14.09.2007 09:55 :: khouly :: Replies: 6 :: Views: 1249
Im starting my thesis and im gonna make a Class-D power amplifier.
I've found many documents about it, but it's never enough!
Does anybody have documents about it ? Class-E or F to !
Recommend a site?
Anything about simulation PA's in Cadence or ads is good to! i've found some (...)
RF, Microwave, Antennas and Optics :: 24.02.2009 13:21 :: RCunha :: Replies: 0 :: Views: 871
I want to design a class f power amplifier. operating freq is 2.4GHz. Pout is 10-25W. GaAs phemt. I am facing difficulties in ads simulation of the transistor in load pull and source pull analysis due to the unavailable of transistor MET model. Any suggestion on how and where can I get the (...)
EDA Jobs :: 28.04.2009 12:57 :: kezambo :: Replies: 0 :: Views: 743
I want to design a power amp at freq 2.45GHz. I am facing the problem to get the transistor model to use in ads simulation. Any body can help me??please
RF, Microwave, Antennas and Optics :: 23.06.2009 08:42 :: kezambo :: Replies: 7 :: Views: 1664
i need a schematic diagram of class E power amplifier for ISM band and for simulation in ads
RF, Microwave, Antennas and Optics :: 29.09.2009 15:16 :: rezaee :: Replies: 0 :: Views: 842
i am new one in using ads for amplifier......
can any one help me steps to design power amplifier at 1.5ghz in ads..........
plzzzzzzzzzzzzzz help me.......send some examples or procedure.steps..what data u have.
RF, Microwave, Antennas and Optics :: 23.12.2009 14:27 :: shahzad074 :: Replies: 3 :: Views: 1188
If you are making LNA match input first for gain/noise trade-off. Then you can look at the drain to see which impedance is seen there and apply conjugate matching. For PA you start by matching output for optimum power output/efficiency and then conjugately match input. Valid for unconditionally stable transistors, if not you can "kill" (...)
RF, Microwave, Antennas and Optics :: 21.09.2010 13:57 :: flyhigh :: Replies: 6 :: Views: 1154
I am designing a RF power amplifier for my final project. The PA adapted Doherty architecture.
I intend to design it for input power of 25 dBm (which is 0.316 W). If the input signal is a sinusoidal signal, how much is the peak voltage?
The 25 dBm, can I consider it as a RMS value and using P = Vrms^2 / R (...)
RF, Microwave, Antennas and Optics :: 27.04.2012 00:34 :: darwinxie :: Replies: 5 :: Views: 701
but my lecturer asked me to do simulation for the circuit attached
Ask him what exactly he wants you to do.
simulation can mean many things, from system level (building block) simulation to circuit level simulation. For small signal, you can use linear simulation, but at higher power (...)
RF, Microwave, Antennas and Optics :: 22.06.2012 07:19 :: volker_muehlhaus :: Replies: 7 :: Views: 1173
ads has a example about Class-D amplifier, but that is direct freq amplifier, runing at 850MHz.
You can find that amplifier in ads2011 example, about class-D and THD calculation.
But the live audio class-D amplifer has freq convertion, i.e. has a clock, say 1.6MHz, and (...)
RF, Microwave, Antennas and Optics :: 20.04.2013 19:39 :: tony_lth :: Replies: 5 :: Views: 563
I want to design a power amplifier and I need a ams CMOS C-35(nmos MN1) for my design,but I can't find it in ads library.what should I do?
Electronic Elementary Questions :: 10.06.2013 03:40 :: beta3 :: Replies: 1 :: Views: 197
It is difficult to give good advise without having knowledge about any details regarding your design, but it sounds as if it is about a HF PA. Generally, correct decoupling of the power supply is a must in a practical circuit. Also, remember that for GHz-range PA:s capacitors do not always behave perfect. Furthermore, the datasheet specs are often
Other Design :: 30.01.2002 04:18 :: Pim :: Replies: 9 :: Views: 4332
It depends which amplifier you are designing & Analysing...
1. power amplifier(PA)
2. Low Noise amplifier (LNA)
Single tone distortion
PAE ( power added efficiency )
RF, Microwave, Antennas and Optics :: 25.10.2005 03:30 :: Manjunatha_hv :: Replies: 8 :: Views: 780
I am recently designing a PA using Jazz SBC18PT design kit in ads.
The topology is to sum the power by Wilkinson power divider and combiner.
But I don't know how to do design the divider and combiner in ads.
Which component I should use for transmission line during (...)
RF, Microwave, Antennas and Optics :: 01.05.2007 00:45 :: zechery :: Replies: 14 :: Views: 1827
jus wanna know...what does harmonic balance simulation shows...like say i performed harmonic balance simulation 1-tone on an amplifier at some frequency say 10GHz (input power 10dbm)...what i got was about 7db at 10GHz and -ve db values at the other 5 harmonics...how can i interpret it..
RF, Microwave, Antennas and Optics :: 03.07.2007 07:19 :: deeptimongia :: Replies: 7 :: Views: 1466
Hi..i already choose the proper transistor for power amplifier design at 2.4GHz..but the problem is that model transistor is not there in the transistor library in ads. So how to simulate in ads....please help me...
RF, Microwave, Antennas and Optics :: 09.08.2007 03:56 :: jariey :: Replies: 2 :: Views: 910
Hello to all,
I am very new to RF designing and I am a student... I am designing a class F PA for LINC TX(outphasing transmitter), I am using cadence spectra tool to design PA and I have couple of questions...
1. how to simulate the envelope simulation using spectra... since my PA is for EDGE communication standard so I (...)
RF, Microwave, Antennas and Optics :: 21.10.2007 12:04 :: akrathi :: Replies: 0 :: Views: 900
If it's a High power Amp you should get the Impedance vs. Freq from the
IC maker. Conjugate Match your circuit to the Impedance and you will get better
performance. The S-Parameters are more for small signals and it's hard to
make models to simulate AMP's as they reach higher powers.
RF, Microwave, Antennas and Optics :: 09.02.2009 16:34 :: Element_115 :: Replies: 13 :: Views: 7348
Im currently designig a Switch Mode power amplifier in UMC 0,18 tecnology.
I want to determinate the Vt, Cds, Cgd, resistence on and Ft of a Mosfet Transistor. How can i do it with ads? What type of Analysis? LSSP? How?
I know that for large signals the typical model of Mos isn't apllied, and there ar
RF, Microwave, Antennas and Optics :: 13.03.2009 14:09 :: RCunha :: Replies: 6 :: Views: 1547
-Class-E amplifiers are switch mode amplifiers therefore you should select the transistor which will have low Rds ,low Cds and Cdg,high Ft but the Drain surface will able to carry the drain current.There are some trade-offs between these parameters but there should be an optimum one.
-Second thing is that, simulating Class-E (...)
RF, Microwave, Antennas and Optics :: 06.07.2009 07:58 :: BigBoss :: Replies: 5 :: Views: 2584
1)First select an appropriate transistor.
2)Design bias network by looking its datasheet.
3)Make loadpull simulation that is under the design guide menu.
4)Then select the load reflection coefficent that gives the power you want.
5)Then realize this load reflection coefficent on the circuit then use harmonic balance analysis to calculat
RF, Microwave, Antennas and Optics :: 16.04.2010 09:16 :: alperuslu :: Replies: 3 :: Views: 1810
These days I am designing a 2-stage power-amplifier in 5.8 GHz in ads , but when I test the S parameter , there is something strange about its MAG(max available gain ) , in low frequency , its MAG is -3040 while in 5.8 GHz its MAG is normal . when I test the first and second stage PA separately , the (...)
RF, Microwave, Antennas and Optics :: 11.10.2010 09:09 :: zhangren :: Replies: 2 :: Views: 375
I am simulating a Common Source FET amplifier in ads, and analyzing S-Parameters, but I have a few questions.
The simulation result shows really bad S11 (close to 0 dB). I wonder if this is ok. I mean, the amp's input impedance is high, so the huge mismatch is causing this behavior.
The idea here is to use this as a (...)
RF, Microwave, Antennas and Optics :: 04.03.2011 07:02 :: mateusbatera :: Replies: 1 :: Views: 605
I simulate a MMIC RF power amplifier (PA) in ads (advanced design system), s-param simulation is working well but harmonic balance not. Increasing the input signal power of the PA, the output signal power increases unconditionaly, even more then DC power (...)
RF, Microwave, Antennas and Optics :: 03.04.2012 10:57 :: rafei :: Replies: 3 :: Views: 466
Using s-parameters is useless in designing "switch mode amplifiers" because they are not valid anymore in this mode.
E-class or F-class amplifiers are desgined by using nonlinear models and HB simulation technique.
Grebennikov's "High Efficiency power Amplifer Design" book will help you and (...)
RF, Microwave, Antennas and Optics :: 27.12.2012 11:24 :: BigBoss :: Replies: 3 :: Views: 377
You have to use Harmonic Balance simulation to find output power and its harmonics etc.
Define a certain frequency in "Single tone signal source" and terminate the LNA with a convenient "port" ( e.g. port or resistor )
Fill the the neccesary "frequency" and other fields in HB controller (...)
RF, Microwave, Antennas and Optics :: 25.03.2004 13:36 :: BigBoss :: Replies: 8 :: Views: 1396
Maybe BigBoss is referring to integrated circuits.
Usually in companies that has foundry there are dedicated groups who develops models for their own technologies, and can be very complex one, for both actives and passives devices. I'm speaking about thousands of man-hours of very skilled people.
In discrete designs the job is somewhat (...)
RF, Microwave, Antennas and Optics :: 07.04.2005 01:30 :: Mazz :: Replies: 9 :: Views: 1120
PA Quiescent current is the current that flows in a PA when no input power is present.
The quiescent current of a PA depend by application, depend by max output power or depend by modulation.
Different types of modulations require different quiescent currents, because the PA is working in different classes.
RF, Microwave, Antennas and Optics :: 08.11.2005 05:26 :: vfone :: Replies: 4 :: Views: 1514
But,according to the application technote OA-11 given by national semiconductor,Voltage gain will be (1+Rf/Rg)=3 and the power gain will be
3.5dB,but why we get no gain from ads?
RF, Microwave, Antennas and Optics :: 19.01.2006 07:03 :: Needbias :: Replies: 13 :: Views: 2044
I have a CMOS input amplifier in an schematic design in ads, and excite it with a 1-tone power source of 50ohm Rs, at 900MHz.
Could you suggest an easy way to get a matching network in ads ?
I know how to use the Smith chart utility included in ads where you give your input (...)
RF, Microwave, Antennas and Optics :: 27.10.2006 10:32 :: STOIKOV :: Replies: 4 :: Views: 1347
i use the AD8313 to do the power detector ,the result in GSM power amplifier, at dirst i use the GSM signal from the E4438C and then use the WCDMA, the result is the solpe is the same and the offset is different, i think the simulation is only a guide; at last i use the AD8362 to solve this (...)
RF, Microwave, Antennas and Optics :: 16.08.2007 00:44 :: springf2000 :: Replies: 7 :: Views: 1208
Can anyone please share a track and hold amplifier circuit design/schematic?
I need one with the following specs:
output swing: 1.2V p-p
gain: 6 dB
THD > 70 dB @ approx. 100 MHz
power as small as possible
no restriction on opamp architecture
any design, even close to these specs would do. i (...)
Analog Circuit Design :: 24.09.2007 17:50 :: Aircraft Maniac :: Replies: 1 :: Views: 954
I want to simulated efficiency and output power of a PA by 3G modulated signal. Can anyone tell me which kind of signal source or test bench should be used? I want to simulate them by Harmonic Balance simulation, not in system level. Thanks!
RF, Microwave, Antennas and Optics :: 12.11.2008 03:52 :: triple_core :: Replies: 3 :: Views: 653
About Circuit Envelope simulation
This is a description of Circuit Envelope simulation, including when to use it, how to set it up, and the data it generates. Examples are provided to show how to use this simulation. Detailed information describes the par
RF, Microwave, Antennas and Optics :: 09.04.2009 14:01 :: VSWR :: Replies: 5 :: Views: 1918
i have designed a power amplifier for 2.4ghz in ads and i simulate it in S-Parametere simulation and plot Z(2,2) vs frequnce i see output impedance of circuit is 30.49Ω but the load impedance that give maximum power (RL-opt) is near 10Ω now i want to match the (...)
Analog IC Design and Layout :: 27.12.2009 10:48 :: rezaee :: Replies: 0 :: Views: 508
One thing to note is that power Amps are not good to simulate with S-parameters.
S-params are for small signal systems. The best/easiest way is to get the
impedance from the PA Vendor, if you are the IC designer then you might need to
get a high power load pull line and find out the Pmax Load empirically.
PA's put out more (...)
Analog IC Design and Layout :: 10.02.2010 16:35 :: Element_115 :: Replies: 2 :: Views: 1199
LNA design in Ku band is absolutely critical task.That's why, I suggest you read some textbooks before starting this task.
Because simulators are only mathematical tools and they don't do the designs by themselves.
Choosing the right active device, studying on this design in terms of stability, available power gain, matching considerations (...)
RF, Microwave, Antennas and Optics :: 23.01.2011 21:41 :: BigBoss :: Replies: 3 :: Views: 766
I've been assigned to design a wideband amplifier with feedback procedure for 8-12 GHz. The amplifier should have a flat gain in the range of 8-12 GHz. The simulation sofware is ads. I need a tansistor appropriate for that. Please note that the tr shoul not be a power onel.
Who can (...)
RF, Microwave, Antennas and Optics :: 25.01.2011 17:55 :: autict :: Replies: 4 :: Views: 758
active. power amplifier circuit. but I dont know where I can find the S-parameter of a transistor.
Software Problems, Hints and Reviews :: 13.06.2011 20:09 :: Barack :: Replies: 6 :: Views: 550
Recently, I am working with a power amplifier (PA) tuning. I want to know whether there is an optimal method to tune PA.
I want to import the PCB file to ads (Advanced Design System). The example PCB file is shown in Fig. 1. Then in the ads file, I connect a 50 Ohms load to A? point, while the other port (...)
Electromagnetic Design and Simulation :: 22.10.2011 04:35 :: joshuacp :: Replies: 0 :: Views: 551
i use model of NPT1004 of Nitronex. When i make loadpull i can't reach the maximum power the transistor is capable according to datasheet. When i increase the input power the simulation shows error of non-convergence. I play with some advanced parameters at HB simulation and it improve the (...)
RF, Microwave, Antennas and Optics :: 23.10.2011 18:28 :: bubuta77 :: Replies: 4 :: Views: 935
I never heard of measuring IP3 of a PA.. usually it is the P1dB compression that is most important, because unlike linear small signal stages (where its IM3 is 3:1 almost always from its fundamental), in PAs this ration is not 3:1 (the IP3 curve), and it is power level dependent; i.e. the IP3 line is not a straight line, so there is no point in tal
RF, Microwave, Antennas and Optics :: 28.04.2003 14:15 :: Gemini1706 :: Replies: 6 :: Views: 1056
to my knowledge there r 2 kinds of loadlines dc load line and dynamic load line
for the dc load line go to amplifier design guid and use the very first schematic i think it is called DC , GM and power (some thing like this)
RF, Microwave, Antennas and Optics :: 25.12.2003 06:08 :: mkassem :: Replies: 5 :: Views: 4108
i am using SD57060 LDMOS for 850MHz TO 870MHz band.
The amplifier specs are
vgs 2.67v @idq = 100mA
input power = 1.9watts.
amplifier gain 12db approax
output power 20 watts.
The amplifier circuit/matching is designed using ads momentum (...)
RF, Microwave, Antennas and Optics :: 24.07.2012 09:43 :: adnan012 :: Replies: 4 :: Views: 516