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20 Threads found on Low p1db
From the plots in the datasheet we see the p1db, which is about +42dBm. So, you can assume that the OIP3 is equal or greater than +52dBm. 2nd and 3rd harmonic plots cannot give much information about OIP3. I've seen PAs with low 2nd and 3rd harmonics but with poor IP3. IP3 depends very much by the impedance termination of the bypassing circuit (fil
There is a OIPn measurment block in s-parameters simulation palette,use it with low driving level at least 20dB lower than p1db.Then extract the Gain of your LNA from this value.
RealAEL Sir, As you said without nonlinear device/spice model, we can't obtain IIP3,OIP3, p1db, thirdorder harmonic. For my low noise amplifier at 1.3GHz( transistor is AVAGO ATF 54143) which nonlinear device is suitable. which nonlinear model/spice I have to choose. Shall I choose NE71300. I have shown
LInearity parameters are rarely measured on a low-noise amplifier with a gain below 20 dB. You never indicated what signal level your LNA should handle. In a good receiver, stages AFTER the LNA are important in linearity considerations. With your LNA, you should indicate the typical signal power at its input. Depending on application it may be so
the lower limit: input a low level signal, until you can tell the amplified signal and noise floor in SA. the upper limit is p1db.
Typical LNAs are designed for the best NF which often limits the amplifier linearity to low-level signals. Amplifier final stage is responsible for a high P-1 dB. Distribute LNA gain between the first stage having a low NF, and second stage with a high P-1 dB for best results. Both parameters can rarely be met in one stage.
I designed an lna,the input-referred 1dB compression point is shown below 76307 With the increase of input power, the LNA gain increased. I think the input-referred 1dB compression point is very strange I feel normal as follows, 76308
In fact I have a low gain, but if I insert in input 10dBm and NOT 21dbm I have 22dbm in out +12dbm of gain. Therefore the input of 21dBm is too large for this transistor? because I have only 6-7dbm of gain my experiment is video/audio modulator for tv 224.5 Mhz my demo board 71880
Hi folks, I'm trying to design a 3 stage PA line up consisting of pre-driver, driver & a final PA. The predriver & driver stage has been designed & my focus now is to design the final PA that needs the following goals to be achieved: 1) Power= 1.8 Watt or 2 Watt 2) Frequency range= 806-870MHz 3) p1db= 36dBm Besides that, this PA line up
Just for p1db measurements you can use just one power meter. Have to measure first the output loss (between PA output and Power Meter input), and set the power meter offset reading for this loss. Start with low input power from SG, and increase the power until PA output power compress with 1dB. Have to use 0.1dB steps on the SG. [url=image
This is now Avago and not Agilent. Look here: (70mil Ceramic) low Noise High Freq PHEMT 5 dBm p1db On Documents tab there is a link to a Spice Model
Just look on minicircuits site or google, and find an Amp w/ p1db ~= 40 and the rest should take care of itself. But 12V might be too low! Come to think of it this amp has to almost be 100% efficient from DC to RF power conversion! 12Vdc Max Amp Rail ! Assuming a 50Ω system ! You highest possible Pwr = P= 12^2/50 = 2.88W = ~34.5dBm
What qualities within an NPN transistor makes good IP3 (low intermod distortion)? I understand the rule of thumb, p1db + 10dB but for wide band applications there appears to be some transistors that do better than others. tnx
Hi everyone, I am doing a 3.8G low power pre-amp which also bandstop 900M,1.8M and 5.8M everything is ok when using a network analyzer to check. Figure 1 (power = -10dBm), 15dB gain at 3.8G and there is already back off from p1db However, once i use Signal generator + spectrum analzyer to check the gain. I realized there is also some "g
Hi, I'm working on a low power UHF LNA. First I designed single ended the power consumption was around half mW. I had p1db=-15 dBm. Then I designed differential LNA. gain etc. seems similar. Power consumption ~800 mW. However p1db= -30 dBm. I increased tail current until 1.2 mW but only couple dBm imrovements occured. This is an (...)
p1db -10dBm is high? Maybe you want to say is low. low gain for LNA you can have turning OFF the LNA Vcc. The insertion loss through the LNA with Vcc OFF it will give you the low gain mode. Beware that some RF system designs do not require big delta between high gain and low gain mode. A good number for (...)
I use inductive degeneration in the RF transconductance stage,but the p1db is still low(about -25dB).The RF transconductance stage alone has a p1db about -10dB. It's said in some papers that the overall Gilbert mixer linearity is controlled primarily by the transconductance why does the total p1db is so much (...)
i think that your mixer has a very low IP3.
Hi, many of RFIC wants external RF matching components (there is internally matched RFIC) and this components describes main performance of device (p1db,Gain,VSWR) this not simply design work and something else very low noise amplifier are on discrete FET.
What kind of amplifier do you need ? Discrete or Integrated.. low noise or high gain .. p1db ? IP3 ? cheap or expensive? Please be more specific about your projects.. Initially , to design an amplifier from 900MHz to 2200MHz , negative feedback is necessary with transistorized amplifiers. But it's always possible to use very wideband sing