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In RF engineering, impedance matching does not involve adding resistance to the source rather than transforming the existing source impedance by a lossless network. Wideband or pulse systems may use lossy networks to achieve frequency independant impedance matching when maximum output power isn't the (...)
An impedance matching calculator. You specify the real and imaginary values for the source and load, specify the frequency of interest, and LCMatch calculates all possible two element matching networks, (LC, CL, CC, LL).
is a lumped element calculator with many topologies.
It depends on amplifier... If the amplifier is a high power amplifier at RF frequencies, "optimum load impedance" should be found and matching is done with this impedance. Or if the amplifier is low power or small signal amlifier, matching should be done with "conjugate matching technique" to obtain (...)
load pulling the input and the output in order to generate load circles on the Smith chart is the practical way to do this, either in the simulator or on the bench. Theoretical matching starts to depart from reality with Power amplifiers.
This depends by the matching topology. In the L-networks the Q of the circuit is automatically defined when source and load impedances are set. Pi or T networks allows to select a circuit Q independent of the source and load impedances as long as the Q chosen is larger (...)
He is very ambiguous in what he is asking about in 2nd ed problem 3.1. Any directions will be appreciated. I have read the chapter very properly and understand the L-match etc but cannot figure out what is he talking about. It seems like some important point the seniors must know. Consider two approaches to matching a purely resistive 7
Vfone is correct, google Conjugate matching. Also, you will see that a match for optimal Gain will not be the best match for Max Pout in general. Cheers
Read the impedance matching chapter from Bowick book.
hi, i want to match Z-source and Z-load impedance at 2GHz which are present in the attached file, using ADS Smith chart utility. I am confused about the behavior of this utility. At 2 GHZ Z_load is 19.4+j*39.9 ohm. It is provided in the source and load termination (...)
I have input signal where capacitive part is dominated. Do you mean a mostly capacitive source impedance? I have input signal where capacitive part is dominated. What demands compensation? Are you required to achieve impedance matching? However I am getting too narrow characteristic. As result it very se
You can use a directional coupler, it measures forward and reflected wave. By nature, it has a finite transmission line length and a characteristic impedance. But if it's short related to wavelength, it won't cause large changes to the impedance matching, presumed the characteristic impedance is roughly in the same range as the (...)
In general we want all power from the source to get to the load. matching means that source and load resistance should be equal (for sinusoidal signals, conjugate) to meet the best transmission condition.
As you said, sometimes it is intentional to merge bias/match network and this is obvious. The bias network, if not well designd can impact on signal, so on s parameter of the LNA. Also the layout is fundamental, of course. But I do not really understand your problem: could you be more detailed? Furthermore, do not expect perfect matching (...)
Hi Faisal, 1- frequency multipliers are used as signal generation technique, permeting one to abtain and utilize the harmonics of a fundamental frequency technique, meaning if your input frquency is "f" you can get 2xf or 3xf ... 2- one of the approches that is been used for analog divider and multiplier is gilbert cell multiplier, there is a
Hi, does anyone out there know anything about matching Networks. I want to Design matching networks to operate at a frequency of 750MHz, and a bandwidth of 10MHz to match a load of 75W to a source of 50W. where should i start.
My apoligies for the multi post, but I realized that I might get more responses from the u-wave group... My question is with series terminations/matching on a typical high speed PCB bus design, versus matching to say, transmission lines, like when you transition between impedances on a microstrip circuit... --------------------------here is my qu
Hello all, I have another questions.. What's it ment by 'stabiltity test' or 'stabiltiy circules' in case of a design of discrete LNA using BJT..?? How to simulate stability on Agilent ADS?? Also, what's the DC bias circuits i should use in my design of the LNA?? Can it be simply one or two stages of common emmiter amplifier with noise m
As a start, instead of dealing with the complexity of a microphone feeding a transformer which feeds an amp, why not say that any complex network can be modeled with a voltage source and a series resistance? If you say this, then you could analyze a simple voltage divider circuit, which is what power transfer is after all. Next, if you want a
Hi Zin=(1+S11)/(1-S11)*Zref Then you can calculate LC matching for single freq or narrow band case
It is called impedance matching transformer or sound output transformer... match the transformer output impedance to the impedance of speaker..
in the LNA , all u want is a very low noise performance , and this hold that u must match the input from minimum noise which is not the matching for bet S11 , S11 will be -20 or -15 if ur matching for max gain i think it is normal , check ur gain , and noise figure Khouly
How to design input matching of SA636 for 374MHZ (50 ohm) RF input signal? How to calculate L,C values?
There are the two separate matching cases: optimal noise matching and conjugate matching. The first one in used to match LNA input to preceding circuit. It may be filter, antenna, transmission line or something else. This kind of matching provides the lowest noise figure, but may introduce some mismatch (...)
hi, how does the Quarterwave(lambda/4) transmission line acts as a matching transformer between source and load impedance? why not half wave transmission line??????? thanking in advance
I am designing an amplifier at 2 GHz. while designing the matching network, this is how I understand it: for i/p: Zo has to be transformed to Zs conjugate so plot Zs conjugate on smith chart and move from center of smith chart to tht point. for o/p: ZL conjugate has to be transformed to Zo so plot ZL conjugate and move (...)
I am having the following problem on my class-e amplifier design. My S-Parameter analysis shows S11=1.004<-158.5 and S22<766.5u<137.4. If I am correct that's Zin= -0.1034-9.49276i and Zout=49.94358+0.05182i proving that my output is matched to my 50Ω load. The problem is that I can't figure out how to match my input to a 50Ω (...)
Using a transformer means you get inductive coupling, and not capacitive coupling. Using just capacitors, without any inductance, you lose the interstage impedance matching. That means you are losing power. So, there is a possibility to eliminate the transformer, with an LC matching network.
High speed differential pairs always means impedance matching (e.g. 100 ohm) as well, so there is effectively no problem with trace capacitances. Differential pairs at low speed can mean a lot of different things. At least, it usually involve improved common mode rejection, but trace impedances, source and load (...)
The amplifier has 400 overall gain with about 150 MHz bandwidth. It's very easy to get oscillations by unwanted coupling between input and output or through power supply. Apparently, you didn't use a suitable "RF" circuit layout. A continuous ground plane and additional supply decoupling by ferrite beads is suggested, also correctly (...)
Is their any simulator or software which can help me to do this? Yes. One tool which can do this is ZMatch from Nuhertz: Zmatch, Impdedance matching Network Synthesis and Analysis Software for Electrical Engineers ima
Hi all. I know this will be a stupid question but I'm really confused. Attached is a picture of my amplifier design. Transistor used is ATF 36077 and topology is cascaded, reactively terminated amplifier. The microstrip transmission lines are supposed to be for matching purposes however I don't know what value of impedance to put on the transmi
There are basically two kinds of transmission line impedance matching, source side (series termination) and load side (parallel termination). As you can easily see, source series termination is preferable, because it doesn't introduce additional power dissipation. My question is How to reduce or avoid (...)
What will happen if I don’t place them? This is a lowpass filter, to meet the regulations (out-of-band transmitted power). Depending on the values, it can also be used for antenna impedance 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 (...)
In the first place, I would also ask for the exact receiver output configuration (whatever it is, either analog or digital signal). and then try to understand, what exactly "doesn't work"? Common collector follower means a single transistor with emitter resistor. But it involves a voltage shift and would need a negative supply not to clip (...)
With loop inductance and frequency known, can you calculate expected capacitance for resonance. This value can be needed to be adjusted depending on how you are connecting to the antenna and if it should include coupling effect from RX loop and its load. Connecting 50 Ohm source can be done in many ways, (...)
Please explain in more detail what you are looking for. Transmission lines, inclusing microstrip and stripline, are inherently broadband if the line impedance Zl=sqrt(L'/C') matches the input and output impedance at the end of the line. From your question, I would think that your problem is impedance matching/wrong (...)
:roll::oops: Re-read the conjugate matching concept, Conjugate matching between source impedance and load impedance means the maximum power should be transferred from source to load, the efficiency is 50%. but confused by it today! When antenna impedance (...)
Why did you place a voltage divider? The filter can be implemented with 50 ohm matching as well.
lots of controlled impedance strip lines. Prop delay must be a controlled impedance for analog broadband, otherwise, most people try to get the delay out of the chip ;) Normally snake shaped tracks are used to offer proper delay for matching bus signals.
thanks for the work you did. It is a school project. I will talk to the professor about this issue. The best matching network I used gave me instability between 100MHZ and 400 MHZ, and other regions were stable. The problem I have to make sure it is stable in the entire frequency band (100 Mhz to 6 Ghz). I have used (...)
The problem I meet is that the input R.L is bad, just as D.J mentioned, and due to the limitation of our measurement system i can not do source matching, can I still use fixed dilevered power to find the optimial load, with the absorbed input power changes much at different load? another thing is how to (...)
Suppose we have an RF power amplifier that the manufacturer has stated that in order for the amplifier to provide max power , it has got to "see" a load characterized by some impedance vs freq. We also know that the amplifier in NOT linear (something like class C for example). We want to use the amplfier in a narrow band system, so we try to ma
Hi, For the Pi or T impedence matching network, the two resonant L network have different Q if the load and source impedence is different. So, what is total Q for whole T or Pi network? Is it the larger one? Why? Thanks a lot. Best Regards. Tony Tao
Is it necessary to calculate the impedence matching in a simple step down transformer considering the line frequency ? Will a transformer designed for 60 Hz fall out on efficiency at 50 Hz ? How is the current rating of the transformer detirmined ? by the thickness of the wire or the number of turns ? To make a step down from 220 to 110 on
impedance matching commonly use in the high frequency aplifiere design. you can use the matching for this reson 1-obtain the max of gain 2-minimum the noise 3-transfer the max power to load 4-reflection of eergy is low and so on. you can use the RF circuit design by Ludwig in the EDA book download for (...)
Power supplies does not need any impedance matching. They are supposed to be as much as possible a voltage sources and thus their internal impedance should be as low as possible. If their internal impedance is high they will waste significant amount of power what is not wanted. Another thing is matching (...)
Hi there I want to match 2.3 ohm (resistive) to 3.3 -j 3.94 ohm using a L network at 4.32 MHz, my problem comes in getting the right loaded Q. I designed the matching network and get a Q of 1.5. But i need a Q of between 3 and 4!!!. How do i solve this? can i augment the network? how do i do this? Any help will be (...)
Hi everyone, I have an LNA whose output is matched to 50Ohm over a small frequency range (LC matching). The stage following the LNA is a filter who is designed to work with 50Ohm load at input and output. Now outside of the band of interest, the LNA is not matched to 50Ohms and therefore the filter (...)