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Power Amplifier And Ads Simulation

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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 khouly
hi, 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 (...)
Hi Friends 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 (...)
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 (...)
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 khouly
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 (...)
yeah , the HB is more robust and converge faster the HB engine in ads id very powerfull khouly
Hi everyone, 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 (...)
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 (...)
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
i need a schematic diagram of class E power amplifier for ISM band and for simulation in ads
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. thanks
Hello, Yes you are quite right there is a interrelation between input and output. Especially at RF frequencies If you are not familiar with RF engineering then I suggest you look up S-parameters. There is also a book by called Microwave Engineering by David Pozar. This book deals with S-parameters, gain circles and stability circles. This will hel
Hi all, 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 (...)
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 (...)
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 (...)
Hi everyone. 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?
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
i am a freshman in rf field. recently i am studying the amplifier, and i am comfused in what targets we want to get in designing with @DS. we know power gain, noise figure and output power are needed, but my question is other coefficients such as harnomic etc. are needed too? thank u!
Use this PA from Anadigics without any other external components:
hi all.. 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..
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...
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 (...)
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.
Hi, 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
-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 (...)
Hi , 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
Dear friends 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 (...)
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 (...)
Dear all, Hi. 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 (...)
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 (...)
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 (...)
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 (...)
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.
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?
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 (...)
I have design a logamp simulated with single tone source as input signal (ads software). Logamp is originally a peak detector used for continuous wave RF power measurement. I wonder, in case input signal is multi cariers or others (CDMA, WCDMA, EDGE, GSM,...), can I still use logamp with some offset tuning for the output? (Some logamp from Analog
Hi, Can anyone please share a track and hold amplifier circuit design/schematic? I need one with the following specs: 1.8V supply output swing: 1.2V p-p gain: 6 dB approx. 200MS/sec 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 (...)
Hi, 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!
From 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
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 (...)
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 (...)
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 (...)
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 (...)
active. power amplifier circuit. but I dont know where I can find the S-parameter of a transistor.
Dear all, 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 (...)
Hi all. 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 (...)
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
hallo 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) thanx
hi, i am using SD57060 LDMOS for 850MHz TO 870MHz band. The amplifier specs are Vdd 28v 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 (...)