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Dear All How can I use Hspcie .meas to determine the settling time of an opamp? can any one show me the Hspice code? Thank you
quaternion, See "Analysis and measurement of Intrinsic Noise in opamp Circuits" by Art Kay. It's a five part series that is downloadable. Google on the title. Regards, Kral
1) estimate your maximum current for this motor 2) calculate max. voltage across yout measurement resistor based on this max current (in item 1) 3) compare to you ADC max input range, also consider your opamp buffer gain, they all must fit in 4) calculate resolution of ADC, compare to changes you want to measure 5) when you send lower PWM value
Hi guys, I have a question here on exact method of PSRR measurement. When i referred to Philip Allen book on the method of PSRR measurement of a opamp, it is stated that the opamp is put in the unity configuration, so the closed loop gain is 1. The PSRR definition in general is given as PSRR=. So since the (...)
Hi guys, I'm confused, in measuring the power supply rejection of a opamp, which measurement is more important, PSRR or PSR? PSRR = Differential gain/ Power Supply gain = PSR = Vout/Vsupply I'm asking this because some designer say PSR is more important, some say have to see overall PSRR....pls explain. Suri
GBW=Gain*BandWidth=Constant -----(1) and speed is proportional to BandWidth (BW), so if GBW higher, with the same gain, BW is higher too, so does ur speed, however if Gain increase, then from (1) BW will reduce and speed will reduce too. as far as measurement of GBW of opamp, u can run an ac simulation, and then check the curve in (gain v.s.
according to your answer, the offset voltage is related with the magnitude of the input common voltage of the opamp? but is it true?? offset is decided my the CMRR of the opamp?
actually there are many website can reply to your answer...for pspice user, you can just type " pspice+opamp ua741+ slewrate/offset voltage" or any word relating to your question. cheers there are also many circuit on the web
This paper provides a testing procedure for measuring noise for an opamp. fig.3 page 5 III. measurement SYSTEM AND measurement METHOD It woudnt be a simple procedure the noise is small magnitude (pico/nano) and not periodic.
Hi! I need to measure three phase AC voltages (~230VAC, 50Hz) in order to control AC motor. I have to use resistor divider plus some opamp and RC filter in order to scale and isolate that voltages which will be connected at input of an ADC (in dsPIC controller). How should I connect resistors and opamp? Please draw it. I want these values at
hello, could u please provide the link or the exact name of the book.....i searched for it and couldn't find it. many thanks Hi it is available at Have a look at opamp chapter in Alan Holberg Book. It is really very
hi guys ,i am doing with a delta-sigma adc which used to measure a nearly dc signal ,i found it is hard to hace an opamp with bandwidth less than 800k but with its gain larger than 80db and phase marge more than 80 . and of course the settling time is also a important specification, it is really difficult to achevie this spec. Is there anyone have
How do I measure opamp' distortion? I don't know how do I confugure opamp I have to AC anaysis? or... some document give little information about distortion measurement is there anyone who have some netlist to measure opamp distortion? I hope some example netlist or opamp configuration to (...)
I have 3 bandgap out of 0.25um CMOS logic process. All 3 are opamp type, with slightly different topology. The simulation or measurement of temperature curves are all correct. The question is that, their VBG die to die variation are very different. two with +/- 100mV, the other +/- 40mV. And I am seeing people posting +/- a few mV result. L
for current measurement usualy we use one resistor which is series with output. Then measure voltage between 2 terminal of resistor. For your specification, you must use one opamp to amplify resistor voltage. For resistor value > 10mV/100uA = 100 ohm op-amp gain > / 10mV
for PSRR measurement use unity gain opamp.fix the +ve i/p at analog VDD give ac 1V and run the simulation.trace the o/p in frequency domain.suppose at DC your o/p is -60dB,uour psrr is 60dB.u can consult the allen hollberg book. please click the helped button if it really helped u.
Hi, I had desinged an OTA or opamp for switched-capcitor circuits(Pipelined ADC), but I don't know how to simulate the settling behavior. As I know, a closed loop circuit composed of capacitors and OTA is needed, then apply a step response to the input, we can get the DC error and settling time(for example, 0.1%) according to the outp
Hi there, It seems no so many people interested in So, let's put it in a simple way. In the below figure, which is appropriate structure to test step response for slew rate measurement in Cadence spectre? Note: the opamp is single stage to drive capacitive load. Which is c
I have designed an two stage opamp with following performance supply: 1.8V open loop gain: 87.1dB unity gain frequency :35.3MHz Phase Margin: 64 Slew Rate:11V/us CMRR:84.6dB PSRR-:65.5dB PSRR+:95.4dB Is there any other test i have missed? By the way, the slew rate is quite low, how can i improved it?
Do you need to physically measure the open loop gain in the lab, or you need to simulate the open loop gain? Obviously, simulating is easier in spice. In any case, though, you need to keep the bias conditions of the opamp intact in order for your measurement to make sense. There are techniques allowing you to measure/simulate the open loop gain wi