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dont forget to test the esr of such big capacitor ! the capacity can be good but the capacitor unusable if the esr is to high !
I recently want to test capacitor's stability, and I want to set up a test lab to test this capacitor. any idea how I can do it ? because some of the capacitor aging almost 80% . but in the datasheet it said it age a little bit. what things make capacitor aging (...)
try the following links: Measuring capacitor ESR and Inductance capacitor ESR Meter regards
Hello, I have some problems for chip capacitors. Currently we are using some "quality" chip capacitors, such as Kemet and Phycomp (Ex philips). But I find them easily short circuit after wave soldering. Especially if the pcb is placed at high humidity environment. The problem seems to be caused by not enough acid cleaning from the (...)
I want to design a LC meter with special test frequency,not with free frequency,anyone can provide some idear?thanks advance!
hi,mogwai. for divider maybe the way is usalbe. but in a switch , R or C MODEL in HFSS to equalize the PIN seems difficult . I've tride the way you used in the divider but failed. maybe you can make a simple test about this ? :o
Hi, I' d like to have your answers to a test on analog design that was submitted to me: 1- In a single stage amplifier, increasing the loading capacitor improve or not closed loop stability? 2- In a single stage amplifier, how bias current influence the gain? 3- How to reduce offset in an op amp? 4- To realize a narrow band low noise amp s
I have not used Calibre exactly, but my guess is that somehow the extraction rule included different geometry shapes in the two trials. A sure way to test it is to use one Rectangular piece of metal, do the two trials as you said, and do one hand calculation. If successful, move on to give it more complex shapes. Verify it thoroughly this way
You will have to post a picture with the model to get a correct answer. You may need to use a lumped port. I've seen a snapshot of an example where the filter feed was perpendicular to the ground plane. You have two options in this case: 1) Draw the feed of the microstrip of the test board and put a regular waveport on the microstrip. 2) M
for muster parameter device,you can test the impedance in two frequence, the you can calculate the capacitance
Hi! I am new to this forum. My question is, does anyone have an idea of a good test-bench for simulating the Common-Source Amplifier? I mean, how to bias the active transistor(dc voltage at the gate) such that the output is maintained at a particular value, for instance (vdd+vss)/2. The biasing scheme need not be practical. Its just for the sa
Dear jordan, Normally we try to do a loop test on the CMFB loop with the main loop inputs put at the VMID voltage which is VDD-VSS/2. Hence you try to measure the loop gain and loop phase margin. But in the case of switched capacitor CMFB, as long as the settling time of the switches is quite reliable in the clock rates, the CMFB is uncondi
I want to test the op amp's noise (up to 10MHz), the output of the op amp is ac coupled by a capacitor. What kind of capacitor should I choose? aluminum electrolytic? tantalum? or ceramic? Aluminum electrolytic doesn't have good high frequence characteristic. ceramic could dishape the signal. For tantalum, it has polarity, so in which way (...)
1.I want to know where the Vcc is added . 2.What does BANANA and JACKS mean? 3.why use capacitor on the top of the picture? 4why use copper wire no. 18AWG on the top of the picture? 5 what does "GROUND 3 PLACES" mean ? 6 what does "PC BOARDS ROGERS" MEAN? THANKS!!!!!
there are many chara. to test. such as trans. dc. temp, power and so on.
How to test a crystal circuit? How to add capacitors beside crystal?I mean ,what types of these two capacitor should I use? Certain value (for example 20pf) capacitor or varialbe capacitor? Thanks.
yes, if the test point can not drive the pad, you should add the buffer.
ICT is a complex testing machine involving electronic+pneumatic component. THe default value is stored by user for each PCB board to be tested. ICT will compare this vlaue the reading that it gets when ICT is functioning. THe main idea is using "Bed of NAils" approach. the pin of nails will touch the PCB on surtance point(that why every PCB
Hi What are test Chips in Layout?? Thanks
I want to test the PLL charge pump current,The PLL loop filter out of the can I test the CP current?
some performance test depends on loading, i.e. phase margin, be sure to know what is your actually loading in application. sometimes 0.5pf is also too large
For a switched-capacitor opamp, the offset is like a squarewave(from -50uV to +50uV), how to measure this offset on test bench? Since it's not DC only value, i cannot just use multimeter to test it. If i use scope, even measure the ground, the value is some 5mV, so it's not accurate at all. Thanks.
Hi, In the ESD test, for pin1 and pin2, if exert a ESD positive zap from pin1 to pin2, is it equivalent to the ESD negative ZAP from pin2 to pin1? Thanks
If the capacitor is damaged then you really do just have to make a best guess. You can improve your guestimate by taking into consideration case size and capacitor function i.e DC blocking, decoupling. If you just want to find out the value of a non-marked working capacitor there is test equipment that will measure (...)
make some samples and test the parameter
Hi everyone, I have to test a high gain (100dB+) op amp as accurately as possible so I tried the circuit on page 5 of this course : using a nulling amplifier. It is quite widely used over the internet. But couldn't make it work. The high gain of the op amp tested makes
hi, smile Using Ohmetter to test the leak resistor of capacitor. and check equality of the capacitor which have big capacity (>10uF). If u use VOM, choose Ohmmetter and choose the lowest scale. Initially,the Ohm value decreases to near 0 fast. Then OhmValue increase to max value slowly (upon to Capacity of Cap) . Cap is usefull. But If (...)
Hi, all could you please give me some advice about how to test a LPF? the parameters I'm interest in include the insertion loss, the AC responce, and the group delay. In simulation, I attach a res about 10K to the ouptut node, but while measuring the LPF, how can I connect the output with the input of a VSA or VNA. If someone gave me some
Thanks anand... TP is not a terminal it's test point. So this capacitor is meant for LED glow time only?. Does it have any function for circuit protection?
One way to test for insufficient settling time in the DAC would be to run the ADC with a slower clock. If the problem decreases or is eliminated, then a settling time issue is most likely the cause.
Hi, I want to buit a high speed Duty cycle corrector circuit. The process is 0.18um CMOS. The highest input and output clock frequency can be as high as 4GHz. On wafer probe test will be chosen. But I have no I idea how to built the I/O circuit. Can I just get rid of the ESD circuit or
I have to analyse a problem with a 24v dc horn in which i am using a capacitor of .7uF 250 vdc and 160vac but sometimes it get faulty after blwing the horn and horn starts consuming more power and after replacing capacitor it gets o.k . I had checked wavefrom accross the capacitor sometimes it goes above 300v peak to peak. now i want to (...)
hi, I am designing a stack inductor. The problem is how to test it. The common way is to test the inductor using network analyzer. But also some guys using a VCO to test Q of the inducor ? Does anyone know how to do this ? Thanks Gang
Shenzhen Lejia Electronic Technology Co.,Ltd. is specialized in making and selling SMD varistor(Multi-layer Chip Varistor) and capacitor(Multilayer Chip capacitor) at superb quality and competitive price. Free sample is available for quality test. Big stock for quick delivery. Non-standard parts is available for order. For more info, (...)
In modern cars, some capacitors are possibly present, distributed in several electronic systems. But no capacitor banks, as you imagined it. A today's battery has to supply a current of 300 to 900 A (depending on the capacity) at 7.5V and -18 °C in the EN cold start test. At normal enviroment temperatures, it can easily supply above 1000 (...)
If no other questions exist related to the circuit, some parts are apparently only in it to test your understanding. For t->∞, simply omit the capacitor and replace the switch by a short.
In general, yes. I know some guys that use a standard 0.1 uF all the way to 35 GHz. However, it is a specific type from the same vendor that they know is good. Some capacitors will resonate at microwave frequencies, and you want to know that. So test a couple sammples of a cap you like, and if they work, keep using that SAME one for future desi
Hi! I am trying to set up the correct test bench for ESD HBM in an on-chip PAD. My approach is to create the correct ESD HBM and then to build a rail-to-rail ESD protection circuit attached to the PAD. I want to verify my thinking, so I would appreciate any suggestions or guidance on doing the above steps. Thanks, D.
1) The no of 2microF,400V capacitor needed to obtain 1.5microF,1600V is i)12 ii)8 iii)6 iv)4 2)In a capacitor he electric charges is stored in dielectric how? 3)A sphere of radii 1m can attain a maximum potential of i)3*10^6V ii)30KV iii)1000V iv)3KV 4)Two coils having equal resistance but different inductance are connected in series.The time
I want to measure a smd capacitor with a vna. Without any test fixture, just by contact with K connector of the vna. How to visualize impedance? How to get impedance & capacitance value from 1 port S parameter? thank you
Hi, When the charge pump only has a load capacitor, I can only see the output voltage and the current at the output looks like noise. When I have a resistor in parallel with the load capacitor, the output is oscillating. How can I test the output current of the charge pump? Many thanks.
One of methods of measuring capacitance (and indirectly dielectric constant) is a simple AC Bridge .. Here is info on AC bridges: Your test capacitor may look like two metal plates and you have to place dielectric under test between the plates .. The rest, after capacitance measurement, is
Some RF receiver chips need an external DC blocking capcitor. Could someone please advise the purpose of this? And in what condition the DC signal might turn up ? (e.g., test signal generated by equpiment might have DC ?) Thanks for the help.
I measured "Z" of a 1pF capacaitor: passive plus,inc. (0402N1R0BW500) over a frequency range of 2390MHz - 2500MHz The "Real" part of Z is different by about 10 ohms across the two test parts. Two seperate parts were used from the same reel Can someone offer a logical explanation to how or why this exist? Perhaps it due to temperature? Perhaps
you are asking help or you want to test everyone?
A long time ago I measured a capacitor with VNA, without any PCB. I held the SMD capacitor with something like plastic tweezers directly on the VNA connector and performed a single port measurement. No need of test fixture or specific calibration... Please don't laugh, I know this is far from the proper way to do but... I did it quickly.
if an inductor also stops RFac from flowing into the DC stem why use a quarterwave transformer instead. What happens to inductor at RF do its characteristics change?
Thanks alot man...but we the transistor test fixture to the end of the transistor(output) it has nothing to do with the input--> refer to the file i added
Ceramic cap can surely handle 5V. Most have a 25 or 50 volt rating. Put one at the V+ pin of each IC with shortest lead possible. The picture of the power supply shows longer leads than you would like. Also keep caps from touching any hot devices, like regulators.