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51 Threads found on edaboard.com: Capacitor Match
i have an antenna whose Zin i have calculated and then use a lumped network(L- shaped network using inductor and capacitor) to match that to a 50 ohm line at 2.4 GHz.now when i am simulating this on hfss i am getting some other resonant frequency so on slightly changing the lumped elements value it is getting tuned to 2.2 GHz but not on 2.4, also e
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 (...)
If you do a T match network for 12 to 50 ohms ( 3 components). Then you can adjust your input L to remove 5j from it. It could turn into a capacitor! Frank
Yes, it's the value 220uf, maximum voltage 16V and maximum temperature 85C that matter. If you can't find an exact match (it is a common part so you should find one easily) you can use one with a higher voltage rating or a higher temperature rating or both but stick to the same value or your amplifier may malfunction. Note that a capacitor like th
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
Each capacitor appears Zc=1/(2pif*C) + ESR. the diodes are dynamic resistance and depend on size. You wont be able to match the impedance because the coupling current and spacing loss makes the input impedance high and the closer you get, it can drop below 50 Ohms. You are much better off using a step-down inductive coil antenna to boost the
These cheap Chinese stabilizers are sold with many private brand names like KEBO, JEENDA, and bought for around $25 in 300 qty off Alibaba. Try to read the cap beside it (Low ESR) Read something like 100uF 12V then match specs in capacitor maker site. Here TBOR. If you have DMM you can read
A general guideline is to select values that will match the impedance through which the filter will act, at the design frequency. A large capacitor tends to be associated with: higher time constant slower frequency lower impedance greater current A high Henry value tends to be associated with: higher time constant slower frequency higher impeda
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.
Hi, I found on a ceramic capacitor the designation "104 C1K" , I have no problem with "104" (100nF), but i don't know what does mean "C1K" ? does it a tolerance? a voltage rating? .....
I have an pizo load element of which is capacitive nature (ZL = 1.2 -J-0.85) normalized at 15KHz. I have Class D power amp driving into an impedance match element. It is basically H bridge with series inductor and capacitor as smoothing filter. Has anyone have lumped model representation of the power amp and how this is represented in smith
Hi, I need help to identify what kind of driver is used in the schematic below. circuit is used to maintain the right voltage on a capacitor bank. I think its a high and low side driver but I searched several manufacturers datasheet and nobody seems to match up with the pin configuration. please help.
Current readings match everywhere in the loop. Resistor voltage indicates current around loop. Resistor voltage leads source voltage. Current leads source voltage. The lower the frequency the greater it leads. Maximum is 90 deg theoretical. capacitor charge always lags 90 deg. behind resistor voltage. Per diagram: images.elektroda.
It's a similar question to this one, but there would be asked with LEDIT. Can some one share the exeperience once making those caps? had already draw the layout. Don't know how to defince terminals and do LVS ...Extraction and LVS check are always failed. Thx a lot
Your title doesn't really match the body of your question. Yes, you can do digital to analog conversion with a PIC (Use the PWM output. Connect it to a capacitor and you'll get a voltage proportional to the pulse width). What is your receiver, exactly? Does it have a serial/parallel output? If so, I think you can bring that into labview through s
I don't know from where you got the schematic, but I am afraid this is not a Class-E. In Class-E topology Cc actually is not a DC coupling capacitor, but it is resonating with L2 on the fundamental. C1 shouldn't exist in that place. To match the low impedance of the output transistor to 50 ohms load, you can split L2 in two virtual series inductors
The capacitor tries to match the voltage connected to it, it the voltage is higher the capacitor charges, if the voltage is lower the capacitor discharges. Alex
chip parts that are slightly damaged (like microcracks) can give off shot noise. Try replacing the part with a different manufacturer's part and see if problem goes away--you could have a bad lot. Tantalum capacitors can have some "sputtering" shot noise if there is a big voltage across them. And of course any electrolytic cap can have all sorts
50 ohm is not compelling. capacitor and inductance are used for the aim that convert output impedance to 50 ohm.
Hi emperor110, You can do in 2 ways 1. Change your Oscillator to be a VCO. Or 2. Change your resonant circuit to be a tuning circuit to match the resonant point by changing the capacitor value (connecting some more or disconnect some capacitor according to the steps of the process).
shortest is always best--gives you more bandwidth for the match. You only go longer if you need too, like you want to use a lumped capacitor in shunt instead of a lumped inductor which you do not have on hand, etc.
in sc-circuit, the ratio of capacitor and switch must be in proportion, to reach better layout performance, but i don't know how to match the switch size. the following is a 2X circuit, vout = vout+ - vout- = 2 * (Vin+ - vin-) - (vref+ - vref-) , to reach better match permance, Cs = 2Cf, but how to set the size of the switches? if the size (...)
No. The inductor voltage will swing both ways (i.e. the collector voltage will go above the positive rail) so the capacitor must be unpolarised. Keith
... except the above reasons, what other reasons can make the circuit resolution worse? Perhaps the external environment is different? Do you have (dummy) capacitors all around? Could you show a plot of your layout?
Does anyone have experience of designing a Negative capacitor circuit ? I would like some help if possible
Read it again, he's saying that solution A is not optimal. "...engineer A can look forward to a long career at SubOptimal Products, Inc." The match is between a 50+j10 ohm source and 75 ohm load. The 25ohm resistor used by engineer A has been removed. Engineer B uses the -j10 capacitor to cancel the +j10 and then an L network to comple
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 guys, How much MIM caps match each other? I read some where its around 0.1% for 1pF cap. Does anyone have any paper etc regarding this? I am using TSMC 0.18um, so can I find any info from the foundry and how? Regards, I think it will be more than 0.1% for 1pF. you will get it from the doucuments provided by TSMC.
Firstly I use the ideal inductor and capacitor to design Then I instead of real passive component but the performance change very much how to use real passive component to simulate CMOS RFIC I use ADS with TSMC model The Q of inductor is very low which change with freq. and geometry I try to use inductorQ with constant Q and then I found i
I am a beginner in layout currently using Calibre for verification and layout editor IC station. I am usig UMC 0.18 design kit. For a capactior layout I got an LVS error. 'property c not found in source' when i checked the netlist generated by Calibre from the layout the properties of the capacitor are all listed there and it all correct.
Ideally is to use a Network Analyzer. If you don?t have something like this try to implement a variable L matching network (a trim-capacitor and a variable core inductor) tuned around the working frequency. Using a receiver on the other side, tune the antenna match for maximum received signal.
Usually process specification include matching coefficients A for capacitors, resistors and transistors. Mismatching is described σ = A / (√ W ? L)
i am designing a lna whose operating frequency is 60GHz, the topology of the circuit is cascode, but i find it's quite difficult to match the ouput impedance to 50 Ω. As shown in the schematice below, there is a parasitic pad capacitor (about 35 fF, which is quite large in 60GHz), which influence the matching and gain seriously. The (...)
What I used to do in those situations is I would see what type of coupling capacitance was predicted by the closed form equations, put that series capacitor into an analysis program and simulate its S21, and then I would analyze my new type of coupling means AT THE MIDBAND OF THE BANDPASS, and get the new coupling mechanism to match the S21 of the
some microwave knowledge is neccessary. for example,adding a capacitor at Gate-Source terminal at first stage NMOS will change the match. then the NF.
Hi Fireball, My experience with ST chips says that it shouldn't desipate heat when driving the motor. Try adding a tantallium capacitor of say 10uF in parallel to the motor phase and a 50 ohm resitor in series with the motor. I have suggested this, to make possible impedance match between the chip and motor. See if this works. ~Kalyan.
why not? The capacitor has better match quality.
hi i am trying to find a better Metal-Insulator-Metal capacitor model. This is what I have right now: C=Er*E0*(a+f)*(b+f)/h where a, b are the width and length of the two rectangular plates; h is this distance between the two plates, (or thickness of the insulator) and f represents effective length due to the fringing field f=4*ln2*h/pi
I was trying to match the amplifier shown below, but after matching, S11 still large!!! I used Smith Chart utility in ADS to match.. and you will find also its results... Same problem when Auto matching is made!! with exactly same resuls... Where's the problem? Can it be due to the blocking capacitor (...)
I think you have some problems in biasing your nand gate. because your nand input voltages don't match output nodes of your comparator. using capacitor is for this reason and its role is dc level shifter. try with changing your biases or adding swithes and capacitors between nand and comparator
what accuracy of capacitor match can I get if I use .25 or .35 process? Thanks very much.
what accuracy of capacitor match can I get if I use .25 or .35 process? Thanks very much.
Do you use the R&C Miller way to compensation your opamp? If you use only C- Miller way, i think a Resistor has to be add to cancell or shift the location of zero which lies on the right half plane. If you use them like above, i think you have to regulate the value of resistor and capacitor to get a match to shift the loaction of zero in
Your L in the circuit will have a positive temp coefficient. You can match it with the proper N type capacitor that will result in very minimal drift with temperature. Another way to combat drift is to make up the C part with a few caps in parallel so the heating effect is spread over a larger plate area.
1. in my opinion, if u can control the parasitic induced from all layers (substrate, poly, Metals), then ur assumption may be worked. But in real world, it is hard to match all the parasitic capacitors. 2. for 8bit resolution AD, the S/H should be also 8bit resolution. assume Ci : sampling cap. Cf : feedback cap. Vo: output of S/H, Vi: input o
If you want quick results, Nuhertz Z match has a 20 day free trial period. It gives LC and transmission line networks. One simple solution is to put a capacitor in series with the load that removes most of the reactance and use a quarter wave line of impedance around 35 ohms. This will get you close but possibly not under the 1.2 SWR figure
Actually the PA_IN of MAX2507 is not perfect 50ohms (as should be), and needs that value of capacitor, to match the 50 ohms output of the SAW filter. For some units I found that S11 of PA_IN is changing with input power, and is not ok (probably is a self bias in the first PA stage).
Hi,sowmya At first,I am sorry to misunderstand you questions:P In fact,the MiM caps' structure is contains three parts .For example , the M3-M4 caps have the lower plate M3,and the dielectric material is normal process material between M3-M4,BUT the UPPER plate is very special:it is constructed with lots specical VIAs. These VIAs are not used
Is no difference between gamma match for dipole or loop antenna. The gamma match capacitor cancels the reactance (imaginary part) of the antenna. Adjustment of resistance (real part) requires adjusting the diameter, spacing, or length of the gamma section.
measure the output return loss of the lan card. if it is complex conjugate of the horn input impedance, that'll will be perfect. else use a capacitor in series will match both impedance