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104 Threads found on Matching Networks
I am doing research on sonar image.where i can get real time sonar image at free of cost What are the new image matching techniques over past techniques
This is well outside my core expertise but I think you may find examples in some of the less classical matching networks like impedance-transforming ones used for Class E PAs and so on in low voltage CMOS; the load is all that matters and the driver port has two states only one of which could be matched at all (the low-Z one). But maybe this is
Hi all, I have designed an amplifier and stabilised the FET unconditionally and checked the K factor across wide band using AWR microwave office and PA was stable across the band. However, when I extracted the EM structures of the matching networks and checked the K factor again, I found out that K factor is below zero at som
I am doing calculations on negative feedback oscillator. Here is some confusing part. If oscillation condition is met either at input or output port, then circuit is oscillating. I understand that. But when i calculate reflection coefficients for both cases, i get different matching networks. I thought that formula of Gout and Gin for both cases w
Hi, How does the S22 of a device impact the figures of merit of the rf power amplifier? I would guess O/P matching networks, but I'd appreciate some details. Additionally, I have a kink in my measured S22, how would it impact the performance of my amplifier? Thanks.
There are numerous plausible explanations for gain compression for a device without matching networks, with the most likely one being that the conduction angle is decreasing. To get optimal performance, expect to do load and source pull simulations, possible with harmonic load pull.
If the circuit of the cascaded RF power amplifier is already done would be hard to interconnect couplers for interstage power measurements. I think the best is to start doing tuning of the matching networks (input, interstage, output), starting from the input to the output. Tune initially stage one and two for maximum PA gain, and at the end, tune
Your S11 is also too bad.. But your circuit has no impedance matching network ? How it will be improved ?? Check the intrinsic input and output impedances of the CasCode only first then apply proper matching networks to match to source and load.
Hello, Did someone experience with simulation of RF PCBs (e.g. GPS). The signal propagation chain looks like this: Antenna GPS --> --> LNA --> SW filter --> GPS module (e.g. from u-blox) All modules in such chain (except matching networks and antenna) have either Spice models either S-parameters. Mat
You need completely different matching networks and different antennas. Probably the best way to do it is to use two CC1120.
I don't know if you use the right non-linear model for ATF54143, but check the datasheet for the Vgs nominal voltage, which I think should be about 0.5V. Initially don't use any input/output LC matching networks, and just a series cap at the input and a series cap at the output, and bias the gate through a 100k resistor from a separate DC supply v
Friends, I am working on matching networks for a power amplifier. In ADS using LSSP and optimization of the matching network help to match at a single frequency, but I want to match over a frequency band. Consider S-Parameters in small signal, it can match input and output matching network over a frequency band, but LSSP (...)
Dear all. Recently I have started designing a radio frequency amplifier based on dual-gate MOSFET BF998. I have simulated it in HSPICE simulation software, designed input and output matching networks. Unfortunately, This is a four-parameter problem which is suitable to be solved by optimization technique. I need to optimize three inductors and one
matching networks use generally low voltage, tight tolerance C0G type temperature compansated type capacitors. For inductors, tight tolerance is preferred. But we don't know your componenets' values and operating voltages,currents etc. Therefore I speak in general. There might be some special applications such as high voltage,high current, etc.
Hi Friends, Can anybody send me the code for TRL Deembedding in MATLAB because i developed matching networks in ADS so i need to deembed that i have all s parameter files i will be very greatfull if anybody send the code
Input and output matching networks plays important role for the stability of the amplifier. Using high-pass topology for the input network, and low-pass for the output network helps to avoid low frequency (or very high frequency) instabilities.
Hi. I am wondering about coupling capacitor value. What are criteria in choosing input/output coupling capacitors for LNA at 1.5GHz? They are parts of input and output matching networks. However, I think to design the input/output matching network we need to determine the values of these capacitors first.
I'm really interested in RF harvesting and I would like to ask the edaboard members if they can suggest some good BOOKS and reference papers that give detailed information on "Rectennas", its matching networks and its mathematical formulas to calculate the output voltage and conversion efficiency. Awaiting positive reply, Regards
The datashseet shows suggested matching networks for different frequency bands together with s-parameter magnitudes, which can be read as an implicite impedance specification. It should be also considered that s-parameter specifications of power amplifiers are of limited worth because the impedances are actually level dependant. As in any real R
In addition to reidintransit's reply, CPW facilitates the integration of lump-element matching networks.
You need to know M1 input impedance for the given operation point and circuit. Unfortunately, it's affected by M1 load impedance. So you'll usually start with an estimated value and later adjust the matching networks. Then the matching network can be designed by different methods. Graphical design in Smith Chart is a common method, there (...)
hi, I am using ADS as a tool for designing a UWB down conversion mixer with TSMC 0.18?m. i am keeping all the W/L ratio and impedance matching networks same as in the tutorial but not getting the same results. My tutorial is is BSIM3_Model. is there any relation in between BSIM3 and TSMC 0.18?m.
hi, I am using ADS as a tool for designing a UWB down conversion mixer with TSMC 0.18?m. i am keeping all the W/L ratio and impedance matching networks same as in the tutorial but not getting the same results. My tutorial is is BSIM3_Model. is there any relation in between BSIM3 and TSMC 0.18?m.
when i design series feedback oscillator using transistor s-parameters, resulting impedances contain real part that must be matched with resistors. But in real devices there are only biasing resistors, that cannot act in such way, because connected through quarterwave stubs. Does this mean that reflection coefficient choosed such way that resistors
I am not sure at all what u are trying to say. Do you have a 1 Ghz square wave hitting the gate? Exactly HOW is it modulated? In general, stub matching will not work for square waves, due to the very large bandwidth needed in the matching network (at least up to the 5th harmonic)
For designing amplifier matching networks, there is the granddaddy (AMPSA) and AWR's iMATCH. Is there anything else out there? tnx, GE ... for octave or greater
Is not a particular type of impedance match. The series gate inductors are used to resonate the internal Cgs of the FETs. Also there are two identical high-impedance bias networks (for Vgg), most probably using quarterwave TL, series chokes, and decoupling caps. The blocking caps (in series with gates) can be used for narrowband matching together
I would like to know if "L and Pi matching network" that are used for impedance matching are reciprocal networks? It looks to me as if they are reciprocal in the case of impedance matching. Thanks in advance.
Dear Friends, I am designing matching networks at 2.45 GHz. I am using ADS software. I want to make use of series stub matching in my design. But i am not able to find it in ADS schematic. please help me so that i could do it.
Hi I want to design a power amplifier in 3.4 - 3.6 GHz freq band , I have chosen the main transistors and their matching networks , now I have question about the circuit which should be use for RF input of this design .
Dear all, I am designing rectifier for RFID tags. I need to calculate input impedance and input power. I did PSS analysis and Transient analysis. Since my rectifier is non-linear circuit. I need to match it with antenna. So, i need matching networks. I am using cadence software with UMC 180nm. I calculated input impedance through man
I'm creating a narrowband matching network at 10GHz using segments pi networks. I was able to match the load to my 50ohm source using ideal caps/inductors from the analogLib library. My next step is to replace the ideal ind with one from the gpdk045 library. I used the Z parameters to characterize the inductor at 10GHz and found the value I wa
It will work, and for sure you get better sensitivity using an LNA at the front end. The problem is that MAX2644 needs external matching networks, and in this way the bandwidth of the LNA would be relative narrow. You can use one of the low-noise MMICs from Minicircuits which are wideband and have 50 ohms input/output (don't need matching (...)
Hi All As a part of understanding how to optimize matching networks in cadence I am designing a matching network to match 10 ohm load to 50 ohms source at 6Ghz. I am using simple L matching network and I know all the equations required. I come up with the required values of L and C. Simulation shows real part of input (...)
I would start here. It is an older book, but is very readable, and you can see where basic stripline and microstrip filters evolve from. Microwave Filters, Impedance-matching networks, and Coupling Structures (Artech Microwave Library)
If the impedance of a microstrip line is not the same with the one you designed (and getting a missmatch loss), there is an option to place some matching networks at its ends, and tune the circuit to compensate for the missmatch loss. The problem that you get in this situation, the circuit becomes narrow band.
Check this RF Toolbox - Designing Broadband matching networks (Part 2: Amplifier) Demo
Hi to all, i have designed microstrip patch antenna array with corporate feed network, my problem is to design a matching network in between them so that it provides good return loss, i have tried in many ways, but not getting good results. please provide me some information regarding this. thank you
It depends on port impedances to be matched. Wideband matching can't be achieved in any case, there are some principal limitations for lossless passive networks. E.g. you can't reduce the Q of a resonant circuit by passive elements (neither lumped nor distributed).
Hi, I have read a bit about transistor design for amplifiers, the parameters that are needed for stability and how to design for stability etc. However, it seems that for the most part, stability considerations and tests such as Rollets K-factor and the mu-parameter are meant for a lone transistor and matching networks. Now, I am not desi
When S21 (dB) is below 0 you have an Attenuator not an Amplifier. But your design has no sort of matching input or out put, so you are basically seeing the S-Parameters. Plot S11 & S22 on a Smith chart and find their values at 2.4GHz. Then put the Conjugate of those Impedance as matching networks and you should get a lot more (...)
I have found this link |pp= in the datasheet , in the characteristics part , there are some of external components values. also they mentioned some input and output impednaces , u can use them to design ur matching networks wish this helps u Khouly
I have seen the spec after adv. I know the relations about the matching of individual resistors, the impact of the switch parasistic resistance, gradient effects and so on for segmented R2R-networks. But these specs seem unbelieveable? Any clue how that works?
You just pointed out, matching networks (for proper load-line), bypass capacitors, and correct handling of harmonics. Bias filtering at both base/gate and collector/drain should not be very narrow, and must have a bandwidth about two times greater than the modulation bandwidth in order to maintain constant group delay and flat gain.
An AEL file is generated by ADS for every design (DSN file) you create in a project. matching ATF files are then generated automatically when each AEL file is loaded. In this case delete all ATF files in the project networks folder (do NOT delete the AEL or DSN files) and restart ADS and see if it then works. Windows or LINUX/UNIX? If LINUX/U
Hi Everyone, I am having problem with my LNA, and like to know, if I reduce the gain of the LNA, can I improve the stability (K). Basically, the K come with the device, and biasing the LNA will help the K, but in my case I am using Module, and biasing does not promise good K, can the matching help on this. (Input and Output matching. I am
Quad band antennas for handsets (as PIFA) usually don?t need any matching networks, because the antenna must be tuned in the way to provide reasonable VSWR for all four bands.
Hi all, I am designing an oscillator at 8 GHz using HBTs on a microstrip substrate. I have designed the input and output matching networks in ADS using tlines and the circuit oscillates as expected as shown in the figures. However, when I add the MTEE_ADS component, the oscillation frequency jumps to 5 GHz unexpectedly! I know that there is a ju
Microwave Filters, Impedance-matching networks, and Coupling Structures (Artech Microwave Library) (Hardcover) by G. Matthaei (Author), E.M.T. Jones (Author), L. Young (Author)
Hi Guys Can anyone recommend some books on filter design and matching design? Thanks