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54 Threads found on Low p1db
I need to design an wideband amplfier with the primary characteristic being low distortion (e.g. all 2nd & 3rd order products below 55 - 60 dBc). The gain is approx. 30 dB, bandwidth (-3 dB) LF - 1,5 GHz, where LF is a sufficiently low frequency (say 5 - 10 MHz). The amplifier will be used to drive a differential ADC input with power of (...)
For LNA's the most important parameters are (Of Course) low Noise Figure, and Gain. If you have low Noise and High Gain this will keep the whole systems noise close to the LNA's. For Example: NFt= NF1 + (NF2-1)/G1 + (NF3-1)/(G1*G2) +..... Now note if G1 is large, NF1 is low and NF2 will not greatly affect the Systems noise( If you (...)
i think that your mixer has a very low IP3.
I know that Peregrine is designing RF switches in CMOS process. The performances depend by application. For example for a GSM mobile where the switch requirements for p1db could be up to 38dBm, would be a challenge to do this in CMOS process (at least today). The compet
Dear All : I design a 0.13um LNA design , The Band is about 100MHz. Now I meet some questions about linearity (p1db) . MY Design p1db is about -20dBm. But the specific is about -10dBm, How can I imporve it ? My design inlcude high ? low gain. Do I need to care the p1db is the high /low gian, Or (...)
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 (...)
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 (...)
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
Hi Emmetin, To increase the IP3 basically you need to optimize your matching circuit at the output. Why output? because the equation for IP3 is Output_IP3(OIP3) = Pout + delta/2 and the equation for Input_IP3 is (IIP3) = OIP3 - Gain, so the output match directly impacting the IP3. Play with the output match and another thing you can do
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
Overall gain seems a bit low but power-out is probably about-right with 15v and, perhaps, 100mA Ic. You would require a larger heatsink than the one that I used;
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.
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
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
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
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.
you shouldn't add any resistive network at the input of the amplifier as they increase the noise. If you want to reduce the gain, add the pi resistive network after the amplifier. But the expense is the p1db is lower.
??? Is 1-dB point not an important figure of merit ???...... this is the 1st time i hear such an assertion. There are some out-band blocker specification to the whole receiver, while IP3 is measured as an in-band characteristic with 2-tone test, an out-band interferer(also know as BLOCKER) could degenerate the signal gain of LNA and lower down t
Hi. What do you want this device for ?. I recently found a very good quality 2.4 GHz stereo audio sender but the output was very low. I needed an amp to supply me with about 500mw or so. I found on ebay a 1/2 watt wifi booster. This worked well for about 2 mins and then it failed. It took out the final PA.:cry: Lucky for me I was able to replace
The mixer design contains a lot of balances. I know the spec is largely depend on the application, but there should be some commonsense there. For example, when designing LNA, we say a -10db S11 should be garentee, a NF less than 2 is good, the gain is more or less around 20dB (narrow band) and a reverse isolation of about -30 db is acceptable ....
In low-IF or Zero-IF receiver, I have seen the down conversion voltage gain of 10db. Why they define voltage gain in db? Is it feel better than a voltage gain of 3?
to Mazz when test intermodulation, the input level must be 15dbm below inputp1db?? thanks tiger_ads 15dB bolow Ip1db is only a rule of thumb. If you use too low input level you'll not be able to measure the intermodulation products that will be under the output noise level. The IP3, by (...)
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 (...)
The mask for a receiver defines the maximum power of the interferers allowed by regulations, in and outband. As you can expect, sensitive bands are protected by low inband masks...
I have been building UWB systems, and I just use a typical wideband switch. For prototyping, I used modular switches from Mini-Circuits, as for PCB version I am using Hittite switch HMC336. The systems I designed are all based on pulse system, so a critical point to note is the p1db of the switch. Even though the average power is low the instantano
You could create simple lumped element baluns for the RF/LO. Use a SOT-143 crossover diode quad. Then tap off the the IF with a simple low-pass L/C network.
I have read several papers which say that the iip3 of the LNA can be improve by optimizing the input and output load. Like the figure below, by tuning the Z1(0), Z1(2ω),Z2(0),Z2(2ω)(ω is the operational frequence, Z1(0) refers to the load near the DC point, Z(2ω) refers to the load at the frequency 2ω), intermodulation dist
S21 is equivalent with low Signal Gain. Power Gain is the difference between Output Power and Input Power. When the input power is high, LNA is compressing and the Power Gain is not anymore equal with low signal Gain (or S21).
The purpose of external matching is not only to prevent unwanted reflections but also for maximum power transfer. So if the LNA output impedance is high and the mixer input inpedance is low, you may want to match so that you get maximum power transfer from the mixer to the load, and thus have better p1db and IIP3. Greg
Hi, we are starting developing a new system simulator; it can help the microwave as well the low freq designer in their design everyday work. Please have a look and comment! Regards, Max
The maximum IIP3 limit of a single MGF2445 (when is well matched for best linearity) is approximately +36dBm. In general if the gain of the amplifier is high there could be done a compromise reducing the gain and improves the IIP3 point. In your case is hard to do this because the gain of the transistor is already low. The only solution remains
The DC power assumption is 8mW, how to achieve a 31dBm output power? According to his spec, I guess he want 4dBm output power used for Bluetooth Class 2. Since Bluetooth 2.0 adopted QPSK & 8PSK, so the linearity should be carefully considered, 3~4dB backoff from p1db may be necessary. Hi there, I believe your output power
hello.. how to design the power amp with low power consumption? power consumption depend on what?
khouly is right.the vdd depends on your technology, you apply it in your design. 1.8v is conventional for tsmc1801p6m (.18micron technology).the nf for whole of the front end is approximately less then 13db, that in the case of lna it is less than 3db commonly.power consumption for zigbee applications has to be low.but there is wide range for the
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
BFP540 cannot be use for this design, which is looking for 20dBm p1db and 35dB IIP3. BFP540 has only 11dBm p1db, and max 24.5dBm OIP3. As I mentioned before, you have carefully to chouse the transistor and after that the topology. This is a really tough spec for an LNA.
Am looking for an amplifier IC with approx the following parameters. Having trouble finding one: Gain: 20 dB min p1db: +28 dBm min, prefer +30 DC Voltage: 3.3 V Freq: 430 MHz Unconditionally stable Any ideas?
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
Since spur 2 is 2/3 the frequency of spur 3, that would suggest where they are coming from. What do you have in the system that is running at ~256 MHz? Also, why is there a huge spectral drop-out around 280 MHz? Is that your LO frequency? Why is there a drop-out at 280 but not 256? As far as the other spurs (lower frequency), well you have
The PA should be measured with modulation, but if the modulation is digital and have switching for example TDMA signal or CDMA, you need to use specific spectrum analyzer. Best way to measure is use Power meter. Unmodulated will be good to measure but for some signal the Power level will be low. Hope this helps.
Hi I have a question about my RF amplifier design. When I feed it with a single tone CW signal, the output frequency spectrum has a strange response, as shown in the attachment. Basically, the spurious noise is about -30 dBc below the carrier frequency. The RF carrier frequency is at 6 GHz band, and the spectrum analyzer span is 1 MHz, wi
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
In 2-tone IP3 measurment we choose 2MHzlowing paper they've chosen spacing=100MHz or I'm wrong?(Surely I'm wrong :D )you can check it by searching in google something like this(3-5 GHz low noise amplifier ip3 4GHz 4.1GHZ) and you get: point (p1db), IIP3, and power consumption of the LNA ..... initially (...)
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=images.ele
just a guess, but the two things I would look for would be some low frequency oscillation, perhaps at 20 MHz, due to the bias network. The modulation pushed it over into oscillation. the other thing would be simple thermal runaway--insufficient cooling.
Hello,I am trying to design a discrete RFPA to put out greater than or equal 25 dBm(p1db) at 2.4~2.5 GHz and gain is greater than equal 26 dB for very low cost as far as possible .The operation voltage is 3.3 V .Anyone have some design suggestions? Thank you very much!
the gain of amplifier in my case is 3dB cuz i worked in low gain mode
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
83388 here is the schematic. 2 at41485 as amplifier at41485 1dB point is 18dBm when ic=40mA on this schematic's instruction,it is said the LNA's 1dBpoint is 7dBm but when i test it with Network Analyzer S21 is 28dB when input is -20dBm,thats right but when input is -10dbm s21=-20dB when input is 0dbm,the gain is as l