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## wide band input matching in LNA

Impedance matching and filtering are different purposes, although a LC matching network has filter properties and a filter can be designed to provide matching of different source and load impedances. But a matching network that implements (...)

## JESD204B Standard - Transmitter Differential Voltage

This ought to be pretty much like (or identical to) standard LVDS (TIA-644). JESD204B specifies source and load side impedance matching, like other high speed standards (SATA, PCIe). Regarding driver impedance, JESD204B is different from standard LVDS which doesn't (...)

## Impedance Matching between source and load

Hi friends! I am designing a matching network between Known source impedance(50ohm) and known load Impedance(2Mega ohm). I want to know how to find the values of Inductor and capacitor. If anyones kindly share your knowledge.

## To build matching network

Hi friends! I am designing a matching network between Known source impedance(50ohm) and known load Impedance(2Mega ohm). I want to know how to find the values of Inductor and capacitor. If anyones kindly share your knowledge.

## Transmission Line Impedance matching

Hi, I have seen the below formula for calculating transmission line impedance and electrical length for matching a load RL+/- jXL to a source RS+/-iXS. Is this formula valid for all of the combinations of load and source. Sometimes I am getting wrong answers with this (...)

## Rf power amplifier design

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.

## 60GHz integrated amplifier design S22 problem

Hi, I'm designing an integrated amplifier for wireless communication at 57-64 GHz with a SiGe BiCMOS process (but only using bipolar npn transistors). The tools used are Cadence Virtuoso with Spectre for simulation. I have no experience designing high frequency electronics. With a cascode (CE-CB) topology the simulated output reflection coeff

## CMOS Class B Amplifier

Since the the matching circuit has been defined, why don't you implement this on your schematic ?? I presume that you have already defined optimum load and source for this PA.So, design the matching circuits that matche these impedances to 50 Ohm standard port impedance.. I didn't (...)

## HFSS Antenna Impedance Source or 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.

## determine impedance at desired frequency

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 (...)

## Help with mismatched circuit

matching at both line ends and electrical length has to be considered.What's the actual circuit?

## Discrete PV model for real time simulation

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 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.

## Measuring delivered RF power into an arbitrary impedance load

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 (...)

## Need a help in understanding Bode plotter reading??

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

## design a delay line for thesis

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.

## Confused! how much power transferred from antenna to receiver(on conjugate matching)

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%. No, if correct ideal matching is transmission loss 0%. if the (...)

## Matching Network using ADS smith chart utility:

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 (...)

## RFIC Inductor- Non-ideal vs Ideal Implementation Issues

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 (...)

## Mode matching technique for step transition in Rectangular to Circular Waveguide?

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 (...)

## Optimization of Matching Network in Cadence

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 (...)

## How to reduce Over-shoot and Under-shoot Problems?

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

## non-ideal routing of differential pairs in multilayer board

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 (...)

## does good s11 and s22 affects s21?

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

## a confusion in LT5560 0.01MHz to 4GHz Mixer datasheet

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 (...)

## Opamp matching - which pairs have to be matched together?

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 (...)

## Need impedance matching explanation and verification

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 (...)

## Impedance matching : Interesting Thomas Lee problem

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

## matching network for amplifier(ADS simulation)

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 (...)

## How to simulate the IIP3, NF of a non-50 ohms input circuit?

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

## Wideband matching by lumped LC matching networks

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

## matching in power amplifier

Can anybody tell me how to perform large signal impedance matching(both at input & output) for a RF power amplifier operaing at 0.9GHz???

## power loss on matching.

The loss will be 6dB. It's better to use an LC matching circuit, or an 1:1.41 transformer, to reduce the loss to fractions of dB (0 dB in ideal case). matching usually implies low loss, whithout using resistors.

## Matching in power amplifier(PA)

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 (...)

## Is matching source and amplifier Zin always necessary?

I understand that matching the output impedance of an amplifier to the load will supply the most power to the load. But is it always necessary to match the input impedance of an RF amplifier to the source impedance? Even when reflections aren't an issue? Won't more power be delivered to the amplifier's (...)

## Resistor matching Vs RF Matching

Hi, I think there are a lot of things confused in your question. I am not sure that R = SQRT(Rsource*Rtline) is used for any matching?! It is probably Zmatching=SQRT(Zsource*Zload) for quarterwavelength transmission line transformer matching between source (...)

## Problem with impedance matching in ADS

Hi, It is not the same how the matching network is connected, have you check if you didn't mixed up input and output? Try connecting it the other way. flyhigh

## Where to start designing matching networks?

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.

## L matching network Q????

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 (...)

## help me with maximum power transfer

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 (...)

## Question on Differential Input Termination

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 (...)

## The Q of Pi or T impedence matching network

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

## Looking for a software for PI type matching

is a lumped element calculator with many topologies.

## RF Microwave Tools - part 34 (An impedance matching calculat

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).