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And Matching And Differential

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96 Threads found on edaboard.com: And Matching And Differential
Hi everybody, I am trying to design opamp circuits, but I couldn't fully understand how to find input and output impedance of an Opamp circuit. When the configuration is Non-Inverting, input impedance of the circuit is High-Impedance and for impedance matching I may (...)
Hello, As we are following 50Ohm impedance in single ended signals and 100Ohm impedance differential signals in routing. My question is in routing differential like Clock+ and Clock- we follow 100Ohm differential impedance. Is it necessary to follow 50Ohm for (...)
Hi guys I am designing the layout of a a differential amplifier in cadence virtuoso layout xl and technology node is 40 nm. This reqyuires matching of two nmos devices. suppose i made an array of 4x4 to macth two nmos devices, then according to the rule of 40 nm global foundries, how many dummy layers surrounding the main (...)
I want to design a transmitter which is compliant with JESD204B standard electrical specifications and transmitter differential voltage is defined as min 360mV, max 770mV peak-to-peak differential "into floating 100 ohm load". The problem is that, the output impedance of the transmitter (...)
For starters, this is RF so you should not be trying to drive a capacitive load but a matching network with a better characteristic. I would also say you'd be lucky to get a complementary amplifier to work, but a real differencing amplifier with the output also true differential to me seems less likely. and feedback any (...)
The datasheet expects a differential connection of matching network and reader coil. The asymmetrical connection shouldn't be a problem in case of TX as long as the amplifier is achieving sufficient field strength. In case of the RX pins I'm not sure if it's O.K. to connect it to ground level. The development kit schematic (...)
I'm trying to match AD9361 differential RX at 1.3 GHz. I've got the S11 parameters for the RX LNA at 1.3 GHz: freq magS11 angS11 1300000000 0.453016055876785 -82.7105506901038 I'm matching this to the balanced input of a balun. Am I right in thinking that the way to design the balanced i
You have 4 nodes to measure to compute 6 differential values or simply the V/2 error in 3 nodes. This tells if each one of two is imbalanced and not each pair, Generally cell matching is 1% of 1.5V for new batteries, but since Vmax-Vmin is around 1.0Volt or 11.5 to 12.5 with some load for near 0 to 100% SOC, the 1% imbalance (...)
Those are two amplifiers that are not related other than they are both amplifiers. LNA means the amplifier is specifically designed for low noise. It's other characteristics are not defined by that designation and they generally aren't differential. Impedance matching can help improve the signal to noise ratio since it (...)
Thanks in advance. Can any tell me how to match analog circuits to 50 ohm line.. Lets say i have a differential buffer amplifier, and now i want to match the buffer to 50 ohm line. Effectively , gain=0dB, input impedance=100 ohm, output impedance=100 ohm and the Bandwidth (...)
Consider that the absolute output range, and the useful output range will certainly differ. Once you start to bury the cascode devices, your Rout and your gain will drop big-time (as well as your frequency response into any significant output capacitance, change markedly). The matching of load (...)
Dummies are essentially for matching purpose.They are not connected to actual circuit but they occupy a space to improve the matching by adding extra doping/active areas. Large areas are much better in term of matching and uniformity of the doping.
Offset voltage reduces inversely proportional with the size of the (symmetrical and adjacently placed) differential input transistors, s. Pelgrom's well known paper "Transistor matching in analog CMOS applications", which you can find here in this post.
For proper differential application,balun in needed between your loop antenna and transmitter,of course the balun may be deleted only when your transmitter has diff.outputs. The SMD balun is good choice in our band, impedance matching may be needed.
If the current gain is not equal, a differential output voltage will exist for an equal input current. This is even more important if only a single ended output is used and current mirrors are used with a different Vbe characteristic. Some more info here
Natural matching of devices lets you take advantage of differential architectures, compensate one voltage drop for another, depend on even division-ratios and so on. The "goodness" of that matching then becomes a concern.
Hi, Advantages of inter-digitization gives each finger of the gate the same effects. Keep in mind that you must add spares onto the end so that the end finger "sees" the same as a finger in the middle of the row. Keeping the inputs of a differential pair the same length in also expected. The disadvantages of inter-digitization is that for high sp
differential-pairs (e.g. for op-amps or OTAs) and current-mirrors are more examples of where matching can be critical. IC processing cannot create perfect uniformity or accuracy of lithography in both horizontal and vertical directions, and there can be (...)
Modern 4-Ports VNAs can handle to measure differential impedances.For instance, consider an differential amplifier,each input/ouput is connected to one port of the VNAs inputs/ouputs using single ended cables and connectors.VNA calculate differential s-parameters from mixed (...)
Hi, now i designing differential mixer. so there are two input node and each node designed to 50ohm input matching. when i do matching each node i connected to 2 differences port and made adjustment to get 50 ohm. but i got saw few thesis the input (...)
I use signal generator as input signal source for chip test,the DUT matching resistor should be 50ohm for single ended and 100 ohm for differential. However i found the DUT input resistor value is 134ohm (SMA input) , what is the effective input voltage? signal generator freq=440M, level=0dBm
Can someone Answer following questions: 1. How does multi lane Xilinx multi-giga bit transceivers (MGT) assemble data from each lane to make a parallel data value? (lets say interface is x8 which has 8 transmit and 8 receive differential pairs) 2. If each channel/lane in multi lane MGT interface recovers its clock from its own lane then (...)
Hello there. I have a question about impedance matching when you have a balanced connection. I have this network that has two balanced outputs that have 100 ohms each. I want to bring it to 50 ohm unbalanced impedance. The frequency of operation is between 200 and 400 MHz. Now, the most logical answer right away would be: use a (...)
I am looking at a transceiver design. There is a differential output fed to a IFA antenna. My questions are: 1) What is L3 and L4 doing? Are they blocking high frequencies and passing DC? Or do the inductors have something to do with the matching, if so why? 2) Suppose I wanted to (...)
Hi, I am designing a dipole antenna with differential ports, and my main goal is to check the power transfer efficiency from the driving circuit onto the antenna. To do that I am looking at S11(dB) at resonance, and hoping to find a low value (say, lower than -10). The problem is that I haven't found a (...)
As usual.. Divide your circuit by 2 and diff. impedances do your matching as usual..For instance let your diff. impedances be 100+j50 and 50-j30 Ohm When you divide your circuit by 2, these impedances will also be divided by 2 , so you will do a matching between impedances 50+j25 (...)
It depends on your offset and noise requirement. The pmos loading pair mismatch and noise will be reduced by gmL/gmI. gmL is gm of loading PMOS. gmI is gm of input NMOS.
You did the right thing, and for 100 ohms differential impedance, 30 mils trace width should be fine in this situation. EM simulators are the best for simulating differential traces, but there are available few simple/freeware programs which are doing the same thing.
Hihi, may i know how to do interdigitize?? i have inserted two transistors one by one into layout . how should i do so that i can digitize both transistors together for matching? may i know that do i need to do modifications like adding transistor or others on my schematic? or i just need to leave schematic there having two transistors only for the
My question is in my case since the number of fingers is low ... can I go for only interdigitization? Ofcourse you can.You can try those patterns : ABBA (or this as a column,i mean ABBA vertically) or do both interdigitization and common centroid : AB BA
Dear all, I am doing the matching work for differential LNA around 2GHz. To save the chip area, the input matching network is depended on the off-chip components, such as inductor and capacitor. But one thing makes me confused: since there will be discrepancies between off-chip components due to the (...)
How did you match the MN3 and M2? How did you match the input differential transistor of the OP1?
Hi everyone, I have a problem with Ansoft designer. I need to match an amplifier on analog devices module, and all I have is the optimal impedance. The port is differential and I am a bit lost how can I model that and start doing the matching. The (...)
In my design of differential amplier, I use two 40u/8u MOS transistor as the differential pair. and my process is 0.35um BCD. Then ,can I know how many percentage does the matching of input MOS transistor can achieve? ---------- Post added at 16:15 ---------- Previous post was at 16:09 ---------- Can it
Dear all, I am working on differential Fed Antenna. For single-end antenna, we use S11 to evaluate the matching. but how to evaluate the matching of differential Fed Antenna which has two ports excited by anti-phase signals? we can measure its S11, S21, S21 and S22. Any reference would (...)
nelsonys Despite you had provide specifications in distance and width, is usual to most communication standards inform requirements in impedance. Depending on wich CAD are you using, it is possible to match desired impedance automactilly. +++
................. My question is how to derive the CMRR,min equations? CMRR is defined as the ratio between the differential gain and the common mode gain. Both gain values can be calculated from the circuit diagram (assumption opamp ideal). However, you must not apply ideal matching for the resistors (like R
L321 is used to compensate some parasitic capacitor, to have a real differential impedance. L331 is used as choke, from TX-RXswitch pin they bias the RF_N and RF_P pins, at least in TX mode. The 2 lambda/4 sections acts as phase shifting the signal by 180 deg, the additional L341, C341 make some matching impedance to 50 Ohm, (...)
Hi - following question: What kind of UWB Antenna is proposed for a Transceiver operating with 7GHz, sending out / receiving bursts with a 1ns window. and - I have a differential LNA input. matching I think is only possible for narrow but not wideband operation.. so do I have to (...)
Gate leakage and input protection diode leakage. Keith
Hi, I had a couple of questions of differential signaling and calculations for common mode rejection ratio. How do I calculate how much of the common mode noise is seen as a differential signal on the two inputs because of mismatch in the input resistance and capacitance? Please help!
Smith chart is an appropiate tool to design or verify the matching network. Strictly spoken, the TL (differential) impedance and electrical length rather than physical length has to be considered. The 70 ohm impedance given in the data sheet is single ended, I think.
Hi all, does anyone have notes on how to create ECSets for differential pairs, total Etch length, Relative Propagation Delay in Allegro 16.2? I have been searching for tutorials or user manuals on how to create ECSets in Allegro 16.2 but no luck :cry: Please help me guys coz I need to create different ECSets and (...)
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 (...)
We would need more info to give better answers, but here are some ideas. It looks like they are i/p & o/p Wilkinson splitters to go from single ended to differential. I don't know if this needs to be 180° phase shifted or 0°. If it's 0° you can use resistor combiners/splitters as inputs and outputs. (The power might be too much for (...)
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 (...)
Hello Every one, Can any one post the layout for differential pair , with common centerriod configuration. Or the complete layout with the detailed explanation of matching constraints and circuit. I have fair idea of matching and differential pairs. I am (...)
Change port 2 and 3 to 25 ohm differentially. Or use configurations for impedance transformation.
The most important part is the first stage. Please use cross-couple for the first stage matching. Add dummy if possible. and make every differential trace symmetrical.
How can be the matching of the receiver input when this is a transmitter output !? What is interesting is the 10.7MHz resonant frequency of L3 and C3, which is a common IF frequency in FM radios.