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41 Threads found on edaboard.com: Ground Match
Are you certain you need all wires connected? Can you get by with 2 wires sending data? (ground & Tx) Or 3 wires forming a null modem? (ground, Tx, Rx) It doesn't give you the handshaking, but it's easy. If you need functions on all wires, then you must identify the purpose of all pins coming from your two devices. You must match them (...)
i agree with eraste. if your line length is less then lambda/2, the characteristic impedance of the line becomes insignificant. RL of -1dB or -2dB is very bad! if you use large capacitor shunt to ground close to PA output , it will affect the S11 of output match. you are right in here! try to generate alternative matching network without (...)
I am using a 32.768kHz crystal for a ARM M0+ MCU. According to the specification, the crystal tolerence is 20PPM, and the loading capacitance is 12.5pF. To match the loading capacitance, a capacitor is connected between each of the crystal's terminal and the ground. By calculation (considered the PCB and MCU stray capacitance), each of the capacito
From the datasheet it looks like TLE4226G is a match to your PCB as pins 5-8 are commoned together and connected to ground. I did a search on eBay and there you
The junction of R4 and R5 will produce much less noise if it has a filtering capacitor to ground. You do not need a buffer at the input of the simple filter. This circuit uses signal voltage, not signal power. If you match impedances then the signal level drops to half, which will double the noise level.
I did an active balun once, with one input off the drain, and one output off the source as in a voltage follower (dc resistor to ground). had about that bandwidth as I recall
Not '0' is logic '0', not ground. So, for example, it would not be recommended to connect the ground pin of a chip to an FPGA pin held at '0', as the level may not match the level of ground on the ground plane on a board.
Hey everyone, I am new to antenna theory/design, and I am trying to design an electrically short monopole antenna using CST Mircowave Studios. The antenna design is 6cm at 100MHz with a coax feed and ground plane. I first simulated the antenna from a range of 0MHz-2000MHz to obtain some results to use for the impedance mini match macro. Next I adde
hi im using grounded substrate with dimension 50mm*50mm and my results dont match with paper results, whats wrong? 75374 75375 regards - - - Updated - - - i used infinite ground boundary condition in hfss and my answer get better, but i have another question,what is effec
You can excite the 0.125lambda loop with another loop (as you mentioned). You may ground the middle of the loop and use a tap on the loop (delta match). Other option is to open the loop in the middle, connect one end to ground and one end to ground via a capacitor. You can feed across the capacitor. From a simple lumped (...)
Use ground plane, power plane, multiple decoupling caps (for instance 1uf, 100n, 1n in parallel), smooth tracks without 90 degree angles, flip chip devices, match bus wire lengths, and match impedances for digital output to digital input (such as 10 ohm resistor in series).
Well..... I would pursue one of the following: 1) use a multisection power splitter with broader bandwidth, so that a slight shift in match frequency does not bother me, 2) Use a ground plane on the bottom of the dielectric, instead of relying on the metal surface as being your ground plane 3) use something other than microstrip, so that (...)
Maybe I'm missing something but I don't see a ground plane on the top side, are you SMA's connected to GND on the bottom layer? I think people would be able to be of more help if you provided a schematic, and a pic of the underside of the board :D
Any match stub must run perpendicular to antenna. Any ground plane or components near antenna will effect it. You need a balun to convert to balance line to measure dipole. Attached is a drawing for an unbalanced to balanced tranformer for making measurements. It can match impedance or transform an S parameter to another impedance plane.
Hello HouJun, Your model looks fine. You said there is a change from stripline to mictrostrip line, but I can't see it in model. The problem could be when trying to match the coupler from striplinr to microstrip. In general, the striplines are between two conducted ground and microstrip is a conductor above ground. How did you (...)
The output current would be summed against the output voltage through a feedback resistor, to get a voltage DAC output in the end. That makes a "virtual ground" (or common mode voltage) which you would be best off making match what you see in test figures for the linearity / error parameters. On older +/-15V parts this is commonly (...)
1) Impedence matching: for best signal transfer (lowest loss, no reflection) you want to match the output resistance of one system to the input resistance of the next system. For example looking at TV antenna system, you want to use an antenna with impedance of 70Ohm, 70Ohmcable and a receiver with input impedance of 70Ohm. 2) They may actually
eem2am, Regarding the resistor from the NI input to ground, here's the equation for the output voltage error Voe due to input offset current Ib. . Let Rinv be the resistance as "seen" by the inverting input. . Let Rni be the resistance "seen" by the Non inverting input. . Let Rf be the feedback resistor. Then . Voe = IbRf(1-Rni/Rinv) .
Hi All, I use USB type FM headset with USB shield as antenna, and USB shield and PCB ground is connected by a big inductor (0.1uH or 1uH) to provide FM RF match. Other than this inductor, I have match network outside the FM chip(Silabs). I met a issue that poor FM wireless Sens by using a new headset where headset (...)
Not sure what frequency you are working on. For low frequency, you do not need matching network, except the DC blocking capacitor. What you need is to adjust 1/gm close to 50Ohm, and a choke to ground. You may also make use of the choke inductance to cancel out the parasitic capacitance of the device for better match at high frequency. (...)
Hi all, I tried to send a data using RF transmitter (Part No ST-TR1100+TR from ) fitted with telescopic antenna from a 60 ft high which is a metal enclosed room to the ground point. Transmission fails. Where as transmission from ground to metal room works pretty well. What could be the reason for failure in transmission
Hi! Try to match the anteena to the feed. In general the antennas should be monopole so you need a ground plane. What you should see are some discrete resonances proportional to the electric lengths of the semi-triangles/squares of the antenna. Good luck!
I am trying to simulate a cpw-fed quasi yagi antenna using ADS momentum but the results that I am taking doesn't match with the theoriticaly ones. the antenna consists of a microstip and two parts of finite ground plane. Can anyone help?
I have two digital FPGA design boards which use digital ground all perfectly designed 4 layer PCB(2 layers for double side ground). These two boards have two major FPGA chip soldered along with some leds and switches. Now the case is that I use to send data(sda) from one to another using one data bus and one clock line(sclk).Along with this a groun
I have two digital FPGA design boards which use digital ground all perfectly designed 4 layer PCB(2 layers for double side ground). These two boards have two major FPGA chip soldered along with some leds and switches. Now the case is that I use to send data(sda) from one to another using one data bus and one clock line(sclk).Along with this a groun
I usually just create a PEC cylinder that touches the ground and patch. I've used this method with PIFA's and the measured results generally match the HFSS results. I suppose you can use copper or any other real material to match your patch.
The best you will get out of a half wave dipole is 2.1dBi. You could try increasing the length of the 'radiating element'. If I remember correctly A 5/8 wave ground plane antenna gives around 3dBi or so. You will have to match it though, a series inductor should do the trick. Failing that some sort of colinear array will get you more gain. Pete
Hi everyone I am designing a wideband single-ended LNA between 6GHz to 10GHz in 90nm CMOS. I adopted a inductively degenerated LNA with wide band match at the input. I am puzzled by the allocations of the ground pins for this design. Nominally I have two ground pins for this design: one used for generating the bias network for this (...)
To remove the bottom ground, you need to just move it a long ways away. If your real circuit has air under the substrate, then you should add an extra layer of air in sonnet to match the air you have in real life. If you add the extra layer of air, then I suggest you change the bottom of the box to free space. Sonnet Lite limits you to only 3 di
THe baseband I/Q output is differential. The baseband information is carried in the voltage difference between these two signals. The A/D input in the baseband needs to have a differential input to match. If you have a single pin for I and a single pin for Q, then the information is between the signal and ground. Same information, different rep
you can use dummy poly & ground them later....from screenshot the layout not match at all ..try use unit cap array them...
The effect of ground is affected by antenna polarization. For horizontally polarized antennas, the effect of ground is usually negligible for heights greater than about 0.2 wavelengths, but for vertical polarized antenna things are more complicated because most of verticals need a ground screen.
In your simulation you have to include the bond wire model when you run the Noise Figure optimization, and re-tune all the input match components. Seems that the inductance (and capacitance to the ground) of the bond wire is changing the Gamma optimum point where you get the lowest Noise Figure.
if it possible connect TXdata and ground only(without connect RTS and CTS) to connect a PIC(with max232) and PC?
The so called BALUN is balance-unbalance converter. In this case, the impedance to ground at the balance ports is 37.5 Ohm, but the impedance between both balance ports is 75 Ohm; at unbalance ports, one port is connected to gound, and the impedance between both unbalance ports is still 75 Ohm.
Antennas don't work alone. It seems your "SMD Antenna" needs a good ground plane. Required ground plane size can be best answered by the antenna manufacturer. Other than that, you will need to use a good 50 ohm transmisssion line to maintain impedance match.
S and LS gates are similar, so see page 12 of the ON Semiconductor LS TTL Data book: I changed the text's transistor numbers to match your diagram: Referring to Figure 1, the base of the pull-down output transistor Q6 is returned to ground through Q3 and a pair of resistors instea
Hi all, I wirte you because i have to design a microstrip Patch antenna in 2.412GHz for wireless aplications. I am using IE3D software to simulate the array. I need that the array has 19 dbi of gain, ROE < 1.4 and a smoller front to back lobule. I don´t know how to calculate the finite ground plane, its dimension. I am using array of 16
I need to get true zero from the opamp. So I need -5, or maybe even -1 for that purpose. It is best to get -5v to match the +5. Power has to be linear regulated . Is there a simple idea out there? can I just stack 2 LDO together and use the middle as ground? thanks Ahgu
[Sure you can use this connector to Xband, but you have to match connector to 50 ohm microstrip line. Going from 50 ohm coaxial to 50 ohm microstrip might cause at 3ghz bad return loss (-16-14db). You have discontinuity of coaxial pin to microstrip width+discontinuity of ground plane+fields i coax are quite symetric, while in microstrip most of the
Is there any way to design a matching network using shunt elements with an nec based program? It appear that only series loads are allowed. I need a shunt negative reactance to ground at the feed point. I'm using eznec. rfc