56 Threads found on edaboard.com: Calculate iip3
i have this circuit in ADS and i want to calculate iip3 .
can anybody help me?
RF, Microwave, Antennas and Optics :: 27.02.2010 12:53 :: alizadeharand :: Replies: 11 :: Views: 1635
hi
i hope :the sentence is correct:?:
i cant calculate iip3 for lna with ads?:sad:
pleas help me
Analog IC Design and Layout :: 08.11.2010 11:06 :: nooshiin :: Replies: 5 :: Views: 906
Hi
how much is enough as iip3,is depend from the maximum input signal that you expected to receive without distortion,you can try to calculate iip3 with AppCAD (it's free).
RF, Microwave, Antennas and Optics :: 31.12.2003 09:04 :: pva :: Replies: 3 :: Views: 1291
How I can calculate iip3 & noise figure & 1dB com. with Aplac
I designed gilbert cell mixer with mosfet (BSIM3 model) and i want to quickly compute main parameter of mixer with aplac v7.6.
any one can help me?
RF, Microwave, Antennas and Optics :: 08.08.2005 06:04 :: hr_rezaee :: Replies: 3 :: Views: 787
First of all I don’t know what MWJ article you are talking about. This is a standard RF systems formula.
Second, you have to follow the WCDMA spec for levels, spacing, etc.
Third, seems that you are looking to calculate the LNA iip3 not Receiver iip3. They are different things.
RF, Microwave, Antennas and Optics :: 12.08.2005 06:29 :: vfone :: Replies: 4 :: Views: 743
Dear all,
I know the expression of
P_iip3=(3P_in-P_im,in)/2;
it leads to
P_in=(2P_iip3+P_im,in)/3,
to get P_in,max, let P_im,in=F (noise floor).
P_in,max=(2P_iip3+F)/3.
There are two variables in equation, P_in,max and P_iip3.
In RF system design, which one should be (...)
RF, Microwave, Antennas and Optics :: 09.06.2007 03:52 :: fxxjssc :: Replies: 1 :: Views: 5727
calculate it , or simulate , it
if u want to calculate it , check the book of the razavi , RF microelectronics , it is very good
khouly
RF, Microwave, Antennas and Optics :: 09.12.2007 13:19 :: khouly :: Replies: 3 :: Views: 1343
can u explain more than?
i cant calculate iip3 with this formula:ip_3=ip_3(vout,ssG,.....):-(
thaaaaaaaaaaaaanks
Analog Circuit Design :: 08.11.2010 11:22 :: nooshiin :: Replies: 1 :: Views: 1645
Write your iip3 equation in the outputs menu and then make your simulations by changing bias current utilizing parametric simulation.So, when you change bias current, for each step PSS+PAC will calculate iip3 and you'll obtain iip3 vs bias current curve.
RF, Microwave, Antennas and Optics :: 10.11.2009 14:06 :: BigBoss :: Replies: 2 :: Views: 655
hi all
i want to calculate iip3 in ADs. I have 2 inputs LO and Rf freq for zero if receiver for wimax .the centre freq is 5.20 GHz.what will be the indices and equation required to calculate iip3
pls help
Analog IC Design and Layout :: 25.02.2012 12:24 :: dishasoni :: Replies: 0 :: Views: 262
As your circuit is characterized by voltage (and not power) gain, be sure you appy and measure correct sources and loads.
A common practice is to talk about equivalent power levels. for example you can express the input voltage as equivalent power to 50 Ohm load.
To do so, take the 50 Ohm source and connect to 50 Ohm resistor. Take the input volt
RF, Microwave, Antennas and Optics :: 03.12.2005 10:21 :: Mazz :: Replies: 2 :: Views: 846
One point that people miss while following those tutorials is that port instance at ouptput and input. They should be given a proper source resistnace, according to your circuit. Dont follow blindly the same procedure if you are designing with CMOS as the given examples are with Bipolar transistor.
calculate appropriately your input and output
Analog IC Design and Layout :: 13.05.2006 17:57 :: gunturikishore :: Replies: 5 :: Views: 808
Hello all,
I am trying to get the receiver specs for a mobile WiMax tranceiver, in the standard, the only indication i found to receiver nonlinearity is given by the "adjacent and nonadjacent rejection at BER=10e-6 for 3 dB degradation C/I" numbers.
I really don't understand the term "for 3 dB degradation C/I"?, the standard doesn't give any de
RF, Microwave, Antennas and Optics :: 25.08.2006 12:00 :: ghadahamdy :: Replies: 2 :: Views: 736
I need iip3 of front-end for designing a 5 GHz Mixer in 802.16a. How I can calculate the value of the power of the input interferer,
RF, Microwave, Antennas and Optics :: 06.01.2007 01:03 :: rosaeidi :: Replies: 2 :: Views: 818
yes it is, as can be seen in the wavescan user guide (calculator functions) for THD
just multiply it with 100 and you can use it to calculate ENOB or SN(D)R
Analog IC Design and Layout :: 31.05.2010 17:47 :: flang :: Replies: 20 :: Views: 8547
the 3rd order intercept point (2F1-F2) this should produce a frequency close to the RF signal
so select channel and calculate the 2F1-F2 = Fchannel
khouly
RF, Microwave, Antennas and Optics :: 20.02.2008 20:55 :: khouly :: Replies: 6 :: Views: 672
Hi,
thanks......
how to calculate the widths of the transistors for a given frequency is not clear.......
Thanks........
Analog Circuit Design :: 02.03.2008 18:12 :: chintalaudaykumar :: Replies: 8 :: Views: 1085
Hello,
In order to simulate the IIP2 with Cadence, you do the same when you calculate iip3. But you choice the order of intemodulation which is 2.
The attachement file can help you.
Good work
Analog IC Design and Layout :: 08.04.2008 16:29 :: M.B. :: Replies: 9 :: Views: 2239
For a circuit whose input impedance is high, how to simulate its iip3, gain, NF so that I can use these parameters to calculate the iip3, gain, NF of the overall cascade chain?
RF, Microwave, Antennas and Optics :: 07.06.2008 04:26 :: zhangjavier :: Replies: 2 :: Views: 510
I've never used 0.35
Thus I do not know exactly
You'd better calculate it yourself.
Bosco Leung's book on microwave VLSI circuit design would be helpful.
thankyou!
I guess there maybe some optimum value for iip3-NF under certain current .
Is it possible to achieve iip3 around 10dBm NF<15dB current tail<1mA 2G downconverti
RF, Microwave, Antennas and Optics :: 07.07.2008 14:51 :: fanshuo :: Replies: 7 :: Views: 631
The Cascade calculation formula of Gain/NF/OP1dB/OIP3 can use Cascade or the tool I developed[/URL
Analog Circuit Design :: 28.09.2011 15:39 :: David.D :: Replies: 1 :: Views: 301
Use the free software SysCal to simulation, you don't need to calculate yourself.
RF, Microwave, Antennas and Optics :: 02.08.2011 00:56 :: tony_lth :: Replies: 5 :: Views: 664
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
RF, Microwave, Antennas and Optics :: 27.02.2012 12:51 :: dishasoni :: Replies: 1 :: Views: 244
1. Suppose PA OIP3=+40dBm
2. At PA output port, one CW is +26dBm.
3. At PA output port, another CW is +14dBm.
4. How to calculate the IM3 of the two CWs at the PA output?
Thank you very much.
RF, Microwave, Antennas and Optics :: 12.07.2012 15:23 :: tony_lth :: Replies: 4 :: Views: 640
hello all,
for the moment i am measuring some characteristics of a mixer with RF, LO & IF ports. I have read some article about taking measurements but not every thing is so clear enough. I have few questions.
1. very basic question. since we give LO and IF to a mixer and measure RF at output (up-conversion). when we say i/p power vs o/p power. w
RF, Microwave, Antennas and Optics :: 14.09.2012 16:25 :: luckyali :: Replies: 2 :: Views: 241
Greetings Reader,
I am simulating an amplifier (A simple one)
The amp is merely a differential pair with a tail current source and resistive load. Differential Input Differential output.
I placed 2 ports at the Gates of the Pair - each of them having first and second sinusoid amplitude set to pin in dBm
and swept pin in a swept PSS analysis
Analog Circuit Design :: 02.03.2013 19:04 :: Bellerophon :: Replies: 0 :: Views: 82
Anyone can show argorithm of DC offset calibration Circuits?
Thanks.
My understanding is that they send a KNOWN training sequence at first, where the direct receiver will receive and distort it due to DC offset errors, but then since it already knows the sequence, it can calculate the error in I and Q due to DC offset, a
RF, Microwave, Antennas and Optics :: 14.03.2003 03:37 :: Gemini1706 :: Replies: 12 :: Views: 1735
Choose one text book and read it very carefully> Try to do all of the exercise. Start to design a very simple Op-amp. Use your hand calculation to calculate the gain, bandwidth, pole etc..Change the size of the cap, the transistors and observe how these affect to the output. Use your spice simulatio to check the result. This is a very good start.
Analog Circuit Design :: 17.12.2003 15:50 :: gerryhsu :: Replies: 38 :: Views: 5404
hi all,how i calculate IP3in and IP3out in ads2003
regards
RF, Microwave, Antennas and Optics :: 08.12.2004 20:07 :: abdoeng :: Replies: 6 :: Views: 1384
Because it lacks for display function like NF, iip3 and 1dB point, another fatal problem is that it can't show data on smith map. You still can write your own equations to compute these parameters but its not intuitive.
For linearity analysis, most people use FFT to calculate the 3rd order or 2nd order IM term. But it needs a long time to do a
RF, Microwave, Antennas and Optics :: 12.12.2004 06:37 :: dsjomo :: Replies: 2 :: Views: 552
1. You can have your small-signal excitation input in the "pacmag" parameters of vsin source. If you have more then one input excitation, the output is just the linear combination of the response by these many excitation by superposition.
2. The pac analysis will include frequency conversion effect, i.e. you can calculate the gain from one side
Analog IC Design and Layout :: 10.02.2005 12:33 :: terryssw :: Replies: 8 :: Views: 5089
To Mazz,
From P1dB figure, we can find that the POWER gain is roughly -32dB, but the VOLTAGE gain figure shows that the VOLTAGE gain is 0dB, so the difference between these two values is resulted form the difference of Zin and Zload, or, impedance mismatch.
OIP3(dBm) = iip3(dBm) + "POWER" Gain(dB) ;
OIP3(dB) = iip3(dB) + "VOLTAGE" Gain(dB).
RF, Microwave, Antennas and Optics :: 21.03.2005 06:58 :: dsjomo :: Replies: 15 :: Views: 4007
But since other blocks like LNA use power gain, how to calculate gain, NF, iip3, P1dB... with power gain and voltage gain directly? If can not, it is no point to use db for voltage. Am I correct?
RF, Microwave, Antennas and Optics :: 17.05.2005 16:39 :: yolande_yj :: Replies: 4 :: Views: 623
Hi.
HSpice is not a very good choice for RF applications. However, there are some ways to calculate those parameters. by .DC analysis, HSpice will automatically declare dc power consumption but for ac power consumption you should use integral operator and its not a very easy way. for Noise Figure, by using .noise statement HSpice will report input
Analog Circuit Design :: 01.06.2005 14:52 :: ezt :: Replies: 5 :: Views: 1180
U can use L transformer to obtain amflification . ( eailier i'd discused with my teacher about it , at that time i had to write program on Matlab to calculate circuit 's parameters . I did some mistakes , and didn't get any amplification . I thought as khouly that passive netword does not give amplification . After doing more accurately program i g
RF, Microwave, Antennas and Optics :: 23.07.2005 15:54 :: tieuquaybk :: Replies: 3 :: Views: 720
There are several ways:
1. Use HP-ADS, import your circuit. You can use L, T or Pi matching filter and add it to the output of LNA (drain). Let the HP-ADS generate the Smith Chart for you and all you need to do is to adjust the values of C and L and check the Smith Chart to see if you are getting what you want. Sometimes C or L tapped matching f
RF, Microwave, Antennas and Optics :: 17.08.2005 08:42 :: SkyHigh :: Replies: 20 :: Views: 1762
hi.. i'm a undergraduate student and now i'm working on designing a downconvert mixer for my project. for the purpose of learning, i'm working on single balanced mixer. i have the circuit. but i really dont no how to bias it and determine suitable w/l ratio. i have no experiance in rf analog ic design. i have read a lot of book like "rf microelectr
RF, Microwave, Antennas and Optics :: 06.10.2005 07:02 :: evilguy :: Replies: 17 :: Views: 1948
I have used ADS to compute the conversion gain, 1dB compression point, noise figure and IP3. but when i tried to compute IP3 i face some problem. the problem is at my IF freq my upper and lower intermodulation tone is not identical. mean that at frequency (2F1-F2)-LO and (2F2-F1)-LO dont have the same amplitude. so if i compute IP3 using upper side
RF, Microwave, Antennas and Optics :: 10.03.2006 16:43 :: evilguy :: Replies: 12 :: Views: 1849
Hello,
In RFIC, there is no need for 50 Ohm matching since the distance between the source and the load is small compared to the wavelength.
this implies that there is no need for matching inside the RFIC.
So now the output impedances and input impedances are not 50 Ohm (for example, input impedance of Mixer or output impedance of LNA).
so ho
RF, Microwave, Antennas and Optics :: 12.03.2006 17:51 :: amnon :: Replies: 8 :: Views: 980
If you had obtain the Intermodulation Intercept Point, Noise Figure and Gain/Loss of the various analog block within your design then from which you can then calculate the overall system noise figure and iip3.
You could find the detail calculation example in Razzavi's RF IC Design.
Analog Circuit Design :: 08.05.2006 06:43 :: wchu01 :: Replies: 1 :: Views: 490
in cadence, you should choose PSS simulation which is similar compared to HB simulation with different calculate method(time domain), and it will cost more simulation time.
RF, Microwave, Antennas and Optics :: 24.10.2006 09:58 :: dingjingfeng :: Replies: 6 :: Views: 739
you should not choose (flo - (f1 + or - f2) as the second harmonic the iip2 frequency should be (f1- f2), i think you can detect the power of (f1- f2) at the if port .and calculate the iip2 use the formula "IIP2=Pin+(Pfund,out-p(f1- f2),out)" .Pfund,out is the power at IF port with the Pin in the RF port ,and p(f1- f2),out is the outout power at
RF, Microwave, Antennas and Optics :: 28.10.2007 10:23 :: hilpp :: Replies: 9 :: Views: 2812
as far as i know all the real transistors are bilateral , coz the s12 is finite and have small valuse , which effect the design , but in some cases the transistor assumed to be unilateral to simplfy the hand calculation
but u hvae the simulators , so u can work with bilateral , and make the simulator calculate everything
but u need to know ,
RF, Microwave, Antennas and Optics :: 12.12.2006 18:28 :: khouly :: Replies: 36 :: Views: 2390
yeah.......I have gone through all those books...what my problem is.....while designing any circuit,generally we try to relate the specs and from those we calculate the required bias voltages and widths of the transistors.......how to ralate the same in the mixer as noise figure and 1 dB compression point and others we can not directly formulate..
Analog Circuit Design :: 31.01.2008 08:28 :: udaykumarchintala :: Replies: 13 :: Views: 952
i think u can replace the Iand Q with single path
just to calculate the total NF , gain , and iip3
then apply the result to I and Q
khouly
RF, Microwave, Antennas and Optics :: 04.02.2008 08:40 :: khouly :: Replies: 13 :: Views: 1364
I think you can make a couple of things.
First, you surely need an RF signal generator that you haven't mentioned.
Applying an in band CW (slightly offset respect to LO) tone to the LNA, you can acquire the ADC output (a logic analyzer is OK for that) and do the math to see the output spectrum, so you can calculate the gain, linearity, passban
RF, Microwave, Antennas and Optics :: 25.04.2008 06:03 :: Mazz :: Replies: 12 :: Views: 930
10dB rule only applies when the power coefficient is constant, which is roughly true in block with single transistor and without feedback. In more complicated case, the difference is usually larger.
By the way, iip3 is a virtual number (intecept point of fundamental and 3rd order curves extrapolated from linear region); it indicates how linear is
RF, Microwave, Antennas and Optics :: 11.06.2008 07:56 :: humbleRF :: Replies: 21 :: Views: 8866
i will begin with the Equipment u gonna need
1) Vector Network Analyzer
2) Spectrum analyzer
3) 2 signal sources for iip3 and IIP2 measurmensts
4) Noise source and Noise figure meter
5) Baluns specially ur circuits are balanced.
6) bias Tees to bias your IC
test 1 The Gain S parameters stability
this can be done by using the VNA wil
RF, Microwave, Antennas and Optics :: 12.11.2008 10:55 :: khouly :: Replies: 8 :: Views: 2631
yes , i have this requirements. i need to do a perfect thesis on linearity..
Added after 2 minutes:
i think may be the difference between the worst gain due to distortion should not too large, but how to define it...
Added after 2 minutes:
i think peple may often us
Analog IC Design and Layout :: 09.02.2010 20:08 :: chichi :: Replies: 29 :: Views: 2521
I'm looking for how can we calculate the BER in ADS?
is there schematic circuit ?
what about sensitivity ? selectivity ?
can someone suggest ?
RF, Microwave, Antennas and Optics :: 26.04.2010 18:26 :: nassim1 :: Replies: 4 :: Views: 627
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