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121 Threads found on edaboard.com: Compression Point
I am working in 100GHz for RF design of power amplifier and want to know the ideal value of 1dB compression point for it. and how to relate it with frequency?
What does it mean ? This circuit has no input, what P1dB compression point you're looking for ??? P1dB is a nonlinearity concerned metric and it's ised to charaterize Amplifiers,PAs,LNAs,Mixers, etc. so the "driven" circuits. You got an modulated oscillator then an amplifier... it doesn't make sense...
I have designed a RF Mixer circuit in ADS. I have taken the parameters like gain, conversion gain and 1dB compression point. Now can anyone suggest me to take IID in RF Mixer?
1, LNA = Low noise amplifier, input level = -120 -> -90 dBm, so it is unlikely that it would have enough gain to reach its compression point. Its design would be to maximise gain and minimise noise. 2. 1dB compression point is a useful rating to compare different amplifiers. It does also equate to a certain level of IP3. (...)
I think P3dB remarks that the 3dB CW power compression point and it should be peak power. Peak-to-Average ratio of the input signal should be taken into account to define the right operating point for this PA.
Actually, I read somewhere that we can divide Vdd by Idd (drain's DC current consumption) at PA's compression point. Is that a valid statement?No, when biased near compression, Vdd/Idd should be quite nonlinear. At the very least, you want a load impedance equal to the slope resistance, which is not Vdd/Idd. A goo
IIP3 is not a proper definition to compare P1dB.. P1dB is a "1dB Output compression point", IIP3 "Input Third order Intercept point".So, you cannot compare apples and peaches.. If you meant OIP3, in this case OIP3 cannot be smaller than P1dB by theory.
hi i have designed transimpedance amplifier. but i have doubt in simulating 1 dB compression because in TIA input is current and output is voltage so is it correct to simulate 1dB-CP by using PSS analysis.
what we did, with tessent/fastscan, just load the netlist as usually, and there is a command to analyze the compression ratio optimum for the design. based on that you could generate the kompression engine. The compression ratio could be just to reach a ATE time, without looking to be at the "optimum" point. for secure way (
This is not an easy task and cannot be done without doing a system analysis, which includes characteristics of the receiver (as, in-band and out-band IP3, compression point, etc), and characteristics of the transmitter (as, ACLR and noise power in RX band). All of those, together with TX power and TX/RX isolation (conducted and radiated), will affe
1 If you are operating the PA at 100 % carrrier and its taking a certain current, does this current change when the peaking amp comes on? if it does not then the matching does not change so the PA should be matched to 50 ohms. 2 The Po/Pi curve should be linear, if the peaking amp comes on at the 1 dB compression point then there will be a kink i
The power of the two tones should at least 10dB below P1dB of the amplifier. Sometimes even below than 20dB from the P1dB, to be in a safe region. So measure the P1dB (compression point) of the amplifier (using one tone signal), and after that set the input power of the two tones, and measure IP3.
Hello everyone, I have a quick question. I designed a LNA ( common Source Cascode LNA) for ultra low power application and everything is at the boundary for 220uW power dissipation. S11=-10dB,S22=-11dB, S21=9.9dB, S12<-40dB, NF<2.5dB, Kf> 20 But my 1 dB compression point and IIP3 point do not make any sense. I am getting IIP3( (...)
Hello, I would like to know the main-substantial differences between in-band and out-of-band 1dB compression point.(Apart from the obvious difference of the working frequency, I would like to know the effects of it-what saturates first and so on) If there is any known material you can provide please let me know. Thanks.
Hi, I was wondering how does the compression point changes with increasing or decreasing the a) LO power b) LO frequency c) IF frequency.... does it brings any change or for a given mixer the compression point is always fixed at any cost??
Hello, sometimes the linear dynamic range of square law power detectors is defined between the TSS power level (tangential signal sensitivity) and the 1dB compression point. The books from Maas explain how the TSS value is measured. The term "1dB compression point" is normally used for amplifiers and is defined for (...)
With -20 dBm input and your measured +28 dB gain, the second AT41485 is already past it's 1 dB compression point of +7 dBm (its output power is +8 dBm). As you increase the power, you are driving that further into compression and realizing less and less gain. For -10 dBm input, you're seeing a gain of +20 dB, which means the output power (...)
Hi, In ADS why we take into consideration 5 dB gain compression while deciding component maximum input power ? What this 5 dB signifies ?
When I use the Cadence spectre to run the "hb" simulation for 1dB-compression point of a receiver front-end, an error is encounted. The simulation--output log gives the error information as follows: Fatal error found by spectre at time=201.784ns during periodic steady state analysis, during Harmonic Balance Analysis 'sweep-000_hb' , during Sweep
Gain expansion happen mostly in Class-AB power amplifiers, mainly due to non-linearities in the device parasitics, especially capacitances. These non-linearities provide a cancellation of the compression point at a specific power level. A device that have one-tone gain expansion, will have also multiple nulls in the high order two-tone inter-mods p
Hello, I am designing an 30-50GHz CMOS LNA. I have simulate all the necesary parameters except the 1dB compression point and the IIP3. I am using Cadance Virtuoso. Can somebody explain to me how to simulate these two points. I have found some manuals online but they are all for narrow band LNAs. I would really appreciate if someone could (...)
If you already know the OIP3 and use unequal input levels the equation for IM3 @ (2*f1-f2) is: IM3 @ (2*f1-f2) = P1 ? 2*[OIP3 ? P2 As was stated, your amplifier have to be way below compression.
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
I want to find out the output power and efficiency contours at 1 dB compression point of each loads, instead of the constant available source power. How can I perform this simulation? Thank you for your reply.
P1dB represents a compression point of the output power, when the output power is...output power. For a linear amplifier, only the region of the output power below P1dB is important, when for a non-linear amplifier also the output power above P1dB (in compression) is taken in consideration.
S12 LNA isolation The S12 isolation measurement between the output and input of the LNA has no relationship with measuring the LNA's linearity (IP3), 1db compression (P1db) or point and LNA BW correct? ---------- Post added at 01:50 ---------- Previous post was at 01:29 ----------
IP3 is a "small signal" parameter. It can be measured for large signals, but it is not as meaningful when the amplifier is close to compression. A good starting point would be 20 dB below the amplifier P1dB.
Hello everyone, i have studied that for a linear system output power should follow the input power. But due to the large signals levels outputs get saturated and the point where the gain drops by 1dB is said to be 1dB compression point. I have plotted the output power vs input power but i am not able to interpret the graphs (...)
Dear all, I have a question about the output 3rd-order intercept point simulation frequency setting in up-conversion mixer. I hope anyone could correct me if I am wrong. For example, my upmixer is with input IF, input LO and output RF. For 1dB compression point simulation, I will give input IF=10MHz, input (...)
hi all i am simulating zero -IF receiver for wimax. i want to calculate 1 dB compression point but in HB it is not allowing 0 Hz as output frequency. and for 3 mixer tones what is the iip3 equation pls help thanks
"1 dB compression point" nonlinearity figure of merit is generally not used for receiver circuits. Digitally Modulated signals are simulated or measured as "Bit Error Rate" at the output.You can do this simulatation by defining your receiving chain and it's nonlinearity in a System Simulator or MatLab. In the other hand, ZIF will give you baseband
Hi All, Almost all literature refer to compression point and intercept point measurements in terms of input&output power. When simulating a simple 2stage opamp, that has been designed to drive a capacitive load, how do you setup the simulation for input & output power ? Thanks
IIP3 and P1dB relation is valid under a input level at least 30dB below of P1dB compression point. If P1dB compression point is -for instance- 10dBm and LNA Gain is 20dB, input level should be below -40dBm so that this relation becomes true. Because IIP3 or OIP3 is a an extrapolation point and a circuit (...)
I am simulating a Class E RF Power Amplifier in Cadence Virtuoso Spectre. I am just wondering that if it is normal to measure 1dB power compression point of a non linear (switching) power amp like Class E? Why? If yes, then I am not sure if I set up the PSS analysis right. Could you please check it right below? (433MHz is the operating frequency
Hi, could someone let me know how to measure 1db compression point of a differential VGA using spectre RF. Thanks
Hi, i want to learn about 3rd-Order compression point (IP3) & RF amplifiers in general ,Im a beginner in RF field..Can somebody recommend me some good books to start with?? Thanks n Regards
Thank for your answer :) Juste another question, can I simulate the compression point (IP3) with Hspice RF?
I mean the following: Is there any video, audio, compression etc algorithms (or, is there any standards (it can be media, communication, wireless etc) ) where those FFTs are used? For example DCT (discrete cosine transform) is used in the JPEG compression standard. But for 4, 8, 16 points FFTs I didnt find any applications.
From the nonlinearity analysis we know that there is a proportional relationship beetween iip3 and P1dB(1dB compression point).i.e., if IIP3 is high P1dB also high.But when I simuting my LNA for various IIp3 values iam getting same P1dB.IIP3 varying from 12dBm to 19dBm but P1dB remains at -8dBm.what may be the reason.iam using cadence tool and sp
What's wrong with this 1db Gain compression point analysis?Is it normal?It's not a straight line. (freq=4GHz) and it would be correct to calculate TOI=ip3_in(Vout,15,{1,0},{2,-1},50) in this way I mean setting
Is about 3dB back-off of the output power. P1dB is the compression point of the output power.
In double-balanced mixers even-order spurious are rejected when in single-balanced are not. In double-balanced mixer (compared to single-balanced) the 1-dB compression point and third-order intercept point is almost 6dB higher.
topic moved to Analog Circuit Design section Hello I have designed a Switching mode power amplifier and simulated in ADS , my design can amplify 0dBm in input to 20dBm in output , i simulte my design in ADS for P1dB and the result for P1dB in input is 14dBm , now i want to know is it good or bad?? and please describe to me what value
how I can find the results of design mixer "in the tool ADS" Conv Gain (dB) NF (dB) 1 dB compression point Intercept point of order 3 (IIP3). help me i swim:?::?::?:
1)current thru loops of wire forms magnetic field 2)you are wrong, they are the same 3)vary supply voltage to vary device compression point or add a variable attenuator AFTER oscillator 4)741, do they still make those? All devices on this planet show non-linear characteristics.
How to use the analysis (ac small-signal analysis?) in modeling? Should be used balun with a symmetric input / output? Source power to choose a "analogLib -> port"?
From what I found practically, different compressed PA’s (having the same P1dB), don’t have the same phase change of the signal (AM/PM) near the compression point. I think this is related to the semiconductor process. WiMAX EVM seems to be affected first of all by the AM/PM, and after that by the AM/AM. So, this could be one r
Hi guys, I meet a problem when I using scan compression HPDF structure. First I insert scan on Sub block (using scan compression). Second I want to insert scan on TOP hybrid (using scan compression). The problem occurs: What I want is to stitch the scan chains of Sub to the hookup point on TOP, but the result is some (...)
Hi there, why does only two harmonics are required to determine the 1dB compression point?
Hi How to selecet the output level for an AGC , is it the mid point in the DRl , the max. received power or the first compression point and why? thanks