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41 Threads found on edaboard.com: Passive Load
Hello all I am using an old 10KV/3MA DC high voltage module and a few times I repaired it because parts are very old but this time I have stuck. When I don't connect any load (usually about 3.3 mega ohm 1.5W passive resistors) I have 10 KV at the output but when I connect the load, high voltage get killed. There is a pin (0-10V
For <10% load regulation, the source impedance must be <10% of the load at the desired frequency band. If you don't know either the DAC driver impedance nor the piezo impedance, then how did you design your interface filter? A 2 port passive filter can be made of series or parallel elements to give low or high impedance in either the pass (...)
A freshly calibrated HP8753ES Network Analyzer measured a positive S11 on a passive PCB. The blank PCB will be used for an amplifier, and is composed of input and output matching networks. The only mounted components on the board are 0402 capacitors and SMA connectors. What am I missing?
The crystal piezo device is also a resonator, which may have a voltage gain greater than unity in the passband. But power cannot be increased by a passive echo. The source Tx and load Rx impedance changes also from low to high on the same port so reflections are lower (current) energy, even if the same voltage. Thus what you would see if it were
Active and passive EMI isn't related to supply voltage levels.
The exact load impedance and signal bandwidth matters. RFID readers achieve similar voltage levels at the transmitter coil by tuned passive LC circuits.
Avalanche operation with zero bias is like mountaineering on the sea. Good luck! :smile: Besides specified bias, a suitable load, e.g. 50 ohm resistor (passive) or TIA (active), is required.
Hi, all, In the datasheet of a component, for example, a passive filter, it often plots the S21 over a frequency range under the test condition that source and load impedance are both 50 Ohm. I always wondered, how will the curve change when the source and load impedance doesn't equal to 50 Ohm. e.g. what if the load (...)
Is there any way to create a passive low pass filter for audio using only inductors (including their cores of course), not capacitors or other devices? - - - Updated - - - Is there any way to create a passive low pass filter for audio using only inductors (including their cores of course), not capacit
Presented here device can be used for a computer in 4.0 system for playing and listening to music (4 speakers). It uses two PCBs for TDA 2030, 120VA transformer from halogens (2x12V with modified windings), housing, heat sink, 8cm
shouldn't there be a source resistance? passive filters have to be designed for a specific combination of source and load impedance. It seems like the filter suggested by godfreyl (I didn't understand, if it's actually an exactly calculated Chebyshev BP with the said parameters?) uses Z1 = 0 and Z2 = 600 ohm, which would allow to im
Measured negative real values, are mostly an operator error. How was the calibration performed? By checking/calibrating your probe as open load and short are negative real values avoided in an passive antenna. If it not is possible to do that kind of VNA calibration, make a coaxial balun for narrow band measurements. That kind of balun is very simp
I think in the 1st application (changeable load) the current source just serves as a (passive) measurement instrument. If you make it active (by assigning sweep values), it works as constant current source (CCS). The supply voltage seems to set the limit.
When you connect a lamp load to an SMPS the cold resistance is zero.(shorted)The SMPS is short ckt protected and goes to shutdown. However adding a series choke EI33 to the lamp gives a passive impedance reflected to primay winding of the SMPS limiting the current slope of the primary current in the mosfet device . The DC to the lamp is builtup and
In addition, you hardly can acquire the oscillator output with a passive oscilloscope probe at the collector. It will completely de-tune the circuit, add a strong real load and most likely stop any oscillation (if the oscillator has been working before). If the crystal isn't designed for overtone operation, it will possibly show very bad behavio
Hi, Can some one pls help me with choosing circuit parameters like R1, R2, C, Vin , f , Vout for designing a common source amplifier with passive load in Cadence. I want accurate graph results for Vin, Vout. Nitya1
I really doubt it will like a DC input. Often PC supplies these days have active or passive PFC built into them, so without an AC input they may not function at all. If this is not the case, and the PC supply just has a rectifier first and then an offline SMPS, then it might work. As for the voltage rating... hard to tell without knowing exactly
HI, I am not fully aware of load modulation. The concept I know about load modulation is : passive RFID tags communicates and transfers data to the reader by means of load modulation in the LF and HF range. Because of inductive coupling, magnetic field induces a small current in the tag. Since, the reader and tag are (...)
Did you try to connect the output directly to the 50 ohm input? If you fear to overload the output, place a series resistor. You didn't tell about required level of the 50 ohm signal, but I expect that you will able to use a passive resistor network and don't need a transistor amplifier stage. Otherwise use a common collector follower as buffer amp
hi, according to your description, you are working on the 13.56M RFID, right? If it's a passive RFID Tag, the regulator is much better than LDO, and 1mA current is quite huge for passive RFID. the psrr and sr depends on your application, you need to consider the load circuits first, then go back to see the spec of the LDO, there are lots (...)
Does any body know how to measure the lc tank quality factor with software(rf spectre .i.e cadence) and by calculations too? is it possible to get 900 ohm impedance of an lc tank ?(this lc tank was used for an lna load.)( l=5.49nH , c=651fF).the lna has a dc blocking cap of 2pF value after the tank. what is the relation between the impedance, l
Hi I need help in simulating this circuit using simulink.Its a 324 GHz frequency generator Mosfet M1 to M4:W/L=2.4μ/90nm Mosfet M5 to M8: W/L=2μ/90nm Mosfet M9 to M12: W/L=10u/90nm Differential inductor L=.3nH External load ZL=50ohms On chip choke=.2nH All active devices has a frequency of 81 GHZ Only the passive load (...)
I am designing a passive mixer for a heterodyne receiver. It is a broadband mixer. And after mixing, it is IF=200MHz. And I want to connect a filter behind the mixer. The filter needs 50 Ohm source and 50 Ohm load. In order to provide 50 Ohm resistor for filter, I add a source follower. The follower has gm=20mS. Question: When I connect
Hi, friends I am designing a passive mixer. When I stimulate, I follow the pdf file” LAB2_Mixer_Tutorial” I have two questions. First: As you can see in the schematic I have uploaded, RF PORT and LO PORT are all paralleled with a 50 Ohm resistor. Why? It is a necessary to add the 50 Ohm resistor? In my opinion, a c
hello at 60 GHz u can use TL or passive elements , if ur process supports MiM caps , and spiral inductors u can use them as well yes it is better to have ft 3 times greater the ur operating frequency khouly
Some points sound confused. "load modulation" e.g. is a specific technique involved with inductively coupled passive RFID tags, also Figure 6.12 is about this. I can't imagine a relation to a wireless 300 m link at 1 GHz
hi when a load is called active load or passive load? what r the advantages of one over the other? how to know when to use what type of load? Regards
Could you answer how you build up the polyphase filter? Is it active or passive? For low IF or radio frequency?
Can I have a matching network that can produce matching in the bandwidth of interest while it does not load my previous stage ou of band
Hi everyone. I have a question as follow: It is well known that the lossy transmission line will induce non-negligible ISI effect on the transmitted digital signal. When a passive equalizer is employed, the ISI effect will be reduced, but inevitable DC-loss will lower the voltage level of signal. For example, the original voltage level is betwee
Yes, I've seen this MOSFET but "Efficiency ? 50%". Is there any other solutions? Amplifier must be with passive heatsink.
If carefully constructed, a series resistor into 50 ohms makes an excellent wide-bandwidth low-capacitance probe - much better than typical 10X 10-megohm passive probes. However, the resistance probe will load your circuit somewhat, but that's usually not too important when probing RF and high-speed logic. You must decide if the load will (...)
passive load are load like resistor and diode connected transistor are active load
I have a questions about SAW filters. I know from my filter course that passive filters(LC, RC...) require specific source and load impedances, usually 50ohm, to function properly. Otherwise their characteristics will show considerable ripples or not function at all. Is it the same for SAW filters? The spec sheet mentions "terminating (...)
who can give some advice?
U must not worry about high active load current. Why do you use active load ? Because u can not implement a big resistor in value with a small passive resistor (poly silicon) in dimention in dimension. This is a trade of. U earn in resistor value with small dimension. But u loss in power consumption. Thanks
Hi What does the positive gain of 'passive' matching circuit means.
Look for papers by Andrea Ferrero, I think he is the major expert on load pull (both active and passive setup ) in the world. See also:
Attached circuit is a simple passive filter, It's a Butterworth type or a Chebyshev type? or other type? Could anyone tell me? Could a passive filter be classified to Butterworth or Chebyshev type?
I need to design a power supply powered by 9V cell battery to provide a +/- 6.5V dual polarity power supply with max. load curent of about 1A each rail. Is it possible to apply a National buck regulator IC to implement this? If so, how to implement? Or could you suggest me a schmetic for this with selection of passive components in detail?