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43 Threads found on Lna Linear
I am doing project on design of lna (2 , 4 , 6 GHz). I am using NE76084 transistor manufactured by NEC corp. (formerly NEC corp.). I using the non linear model of the transistor in AWR Microwave office environment. I can not completed the input matching and output matching circuits using lumped element
Hi, I have only the s2p file of NE3512S02 transistor. I am designing lna in Ku band. I need to start with the DC biasing point of the device. Can any one tell me how to find or create its model in ADS? I can perform other simulations but for FET currve tracing I need its non linear model???
Currently I am trying to simulate the noise figure, S11 and S22 parameters for lna at 2.4GHz in HSPICE. Below is the code I used: Calculate noise dec 50 400MEG 3g .NOISE v(vout) vin 1 Calculate S11 and v(vout) vin rin=50 rout=50 .print s11(db) s11(m) s11(p) .print s22(db) s22(
Hi, Im designing a lna using ADS. I have designed my single stub matching network and I use short circuit stubs in my design. I am getting a negative gain and I m confused about this. If anyone can help on this it will be a great help.
I am designing lna at 2.4GHz using ATF541432a. I have designed matching circuitary on input and output side. Now i am left with Bias Circuit design. How can i calculate values of L(for RF block) and C(to block DC)? And if i do voltage divider circuitary then will it affect noise performance of lna? ..... Thanks & Regards
Trying to measure the stability of my lna. I obtained linear magnitude and phase angle data points for S11, S12, S21, S22 across 500MHZ - 18GHz data set attached to post. Using the Rollet's stability formula. k = 1 |S11|? - |S22|? +|Δ|? ---------------------------- 2|S21*S12| where Δ S11S22 - S12S21 My quest
You can use mixed mode s-parameters to have a full linear characterization of the lna. There is a lot of literature about mixed mode S-parameters (google it), I'm giving you just a glance about them: Your device is a 3 port device ( ports are: in, outp, outn) that can be represented as a 3 port device (ports are: in,out_diff, out_comm) without any
I also studying this circuit, it's not work as paper described. @diyanasri : have you still working on lna using active inductor?
Hi, I am a little unclear w.r.t the difference between a Line Amplifier and the general power amplifier or lna? Is the difference only interms of applications like CATV and transmitters? Also, can the linearity of a Line Amplier be increased by using a hybrid? Thanks.
I am designing an lna and mixer for zigbee receiver. my lna gain has varitions between 26.9db for -91dbm input power to 29db for -20dbm!my lna is fixed gain apparently!. but it's gain variations isn't's gain variations file has been attached here. my lna's output impedance is 772ohm. I think it is ubnormally very (...)
Some systems turns ON/OFF the PA (and the lna) in the same time with T/R switching for power consumption reasons. Unfortunately not always is possible to do this, the reason is a phenomenon named "bias settling". Most of the linear power amplifiers needs some time between ON/OFF switching to arrive to a particular bias point.
Hi all, I am a research scholar. I would like to ask how different is designing an lna in ADS using HEMT than using CMOS. i have got a few very basic questions: 1) Is linear model for HEMT possible? 2)What should be the bias region to be considered? 3)from the basic requirements of matching techniques for Noise mitigation, how
Try to make s parameter analysis with using the real model file.ADS gives accurate results.If you design lna for maximum gain your noise figure will be worse than you expected.
Hi, I need the zap file for the FHX13LG transistor. I plan to design an lna using the subject transistor model in ADS. I'd be grateful if someone uploads teh file or tell me the location where to find zap files . Thankyou. Regards.
The values listed are for 1.9GHz. C1 and C2 are blocking caps. O/p side is RFC so these are insencitive for broad band matching. If linear scale applied then L1 will become <2nH which has SRF >10Ghz. First design your lna with ideal components then transfer to practical values.
the requirement for this project is all the components for this lna are passive components. A "passive" amplifier will not have gain. Maybe this is a misunderstand and the task is to do a "small signal" design, based on the linear (small signal) data of the transistor?
hi i have working cst a couple of month about antennas and now i want to design rf circuit like lna power amp. i find circuit plan that include bfp640 transistor and this transistor dont exist in cst library and cst want spice model for non-existent component how can i define a transistor that use spice parameters in cst not use any other program
I have to design a PA/lna for a Zigbee application, which uses OQPSK modulation. I heard that we have to handle a back off value to avoid using a linear PA into saturation but I did not succeed in finding the back off value for OQPSK modulation. Thanks
This is a very wide topic there is no 1 answer to the question you just asked! The answer will change if it's a lna, or a PA, Limiting amp, or a linear gain stage... First find out what type of amp you have in mind, then search this site and google it. After you get the basics down and run in to trouble they ask here.
I am working with an lna with CMOS transistors and read that an inverter have better linearity than a CS-stage but it didn't say why? Anyone know why or have a good reference to suggest?