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Matching Source And Load

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40 Threads found on edaboard.com: Matching Source And Load
It does not matter whether u treat your loop antenna as the source or the load with respect to the impedance matching task, though your loop antenna looks more like the source since it is used as the receiving antenna.
Hello, I am new in IC design. I am trying to make an amplifier using Cree CGH40010F. In datasheet, there are some load and source impedance values up to 3.5 GHz. But in my design I need the impedance value at 4 GHz to construct the impedance matching blocks. How can I find that impedance value? Which type of simulation (...)
matching at both line ends and electrical length has to be considered.What's the actual circuit?
I believe you can model a PV panel as a voltage source with a resistor in series. Anyway it's a start. Example, if it is rated for 12V at 3A, then it can be modeled by a 24V source and an inline 4 ohm resistor. If you attach a 4 ohm load then it gets 12V at 3A, and that is also your condition of maximum (...)
Why matching is needed in analog layout?
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 (...)
I made some experiments on L-network Z matching, first I try the circuit without any match (R1 is source impedance and R2 is the load impedance), and got the following result: the voltage gain = -0.828 dB @ 100MHz I repeated the experiment again, but this time
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.
: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 (...)
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'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 (...)
back to basic always. You know how to do a single step (lamda/4) transition, since you know the lamda/4 impedance matching formula, Zt^2=Zo*ZL So same thing for multi-step transition, we can still choose lamda/4 for each step, and make the matching from load to the source. If you are lazy to calculate (...)
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 (...)
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 (...)
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
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 (...)
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
The answer is not so difficult: the 28 load impedance is matched to 50 Ohm source impedance through the LC matching network. L is splitted into an internal part (you cannot act on it) and an external tunable part, depending on frequency usage. Once you have transformed internal impedance at a certan freq to 50 Ohm (...)
Marked up; the diff pair and mirror naturally must match; the common-source gain stage has a matching requirement but not 1:1, its load current needs to be 1/2 the diff pair tail current (assuming unit devices) for equal current density / VT. In the PTAT reference matching may not be strictly necessary (...)
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 (...)
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
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 (...)
If the input impedance is high, and the source impedance is low, it is merely a buffer amplifier. It is not optimized for maximum power matching at the input but in case of a buffer amplifier that's not what it is used for, it simply cannot load the source. About the noise figure: instead of looking at (...)
also check source pull in ADS , it is good tool to make good input matching circuits khouly
Why do you care about the impedance match? What are you driving it with? Since your load is more like a short circuit than a 75 ohm load, why not drive it with a current source. It will be broadband, and you do not need any whacky on-chip inductors. You just need on on chip transistor. Biff44, Can (...)
u need to change term 2 to ur load impedance , to check the matching , so u need to know how ur circuit will convert the 5o ohm of the source to the load khouly
Can anybody tell me how to perform large signal impedance matching(both at input & output) for a RF power amplifier operaing at 0.9GHz???
I think somewhere is a misunderstanding. The initial post mentioned that the source is 50 ohms (coax cable) and the load is 100 ohms (antenna). In this case to match the source to the load, you need a 100 ohms parallel resistor to the load (to the antenna). In this way (...)
Should the Q of matching network at the PA output as large as possible? To keep the circuit stable, the Q is generally between 1 and 3. How to choose the Q? should I choose 3? or just 2 is enough?
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 (...)
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
i am confused with the impedance matching,when using the ADS tool"impedance matching utility",the source impedance is the conjugate of Zin2,the load impedance is 50 ohms.After adding the tool-designed matching network to the circuit,the output impedance gets smaller,nearly zero,that is to say farther from 50 (...)
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.
Hi Willem, I just want to know the Q you mentioned is for which network. As we know for L network, the Q is fixed by the input resistance and output resistance. Since you want to match 2.3 ohm to 3.3 -j 3.94, you should include the -j3.94 to your network first, so the matching is from 2.3 to 3.3, the Q is fixed if you still want to (...)
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 guys, I have a question overhere regarding the impedance matching. I'm confused over the measurement of the differential input termination. Let say i want to terminate my input differentially (100ohm) or 50ohm single ended, i have to model the impedance as shown in the schematic. But when i measured input impedance differentially thgrough AC
Since the output matching network of the 1st circuit needs a 50 ohm load and the input matching network of the second circuit matches it to a 50 ohm source, I think you can simply cascade them. But it would be better if you have just one matching network between the 2 which would match the (...)
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
Now I am designing a matching circuit for PI type of GSM band, source and load impeadance , operating freq. are available . I need such a software and simulator to design. Thanks. Best regard
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).