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Slew Rate In Op Amp

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30 Threads found on Slew Rate In Op Amp
THANKS, but i meant to measure the rise-time with just the open-loop given op-amp! so i design circuits for this op-amp to find the open-loop dc gain and open-loop frequency and the slew rate. now i have this parameters, but still i don't know how to do this? slew rate has no significance (...)
Dear Neo, Capacitive loads often give rise to problems, in part because they can reduce the output bandwidth and slew rate, but mainly because the phase lag they produce in the op amp’s feedback loop can cause instability. Although some capacitive loading is inevitable, amplifiers are often subjected to sufficient (...)
Unless there is a slew rate problem at larger voltage swings at xx nanosecond transition times in the S&H circuit (unlikely) it is irrelevant. ALso consider if ADC has an OP amp for user input gain control, if there is a spec for GBW product in the ADC input. ( but unlikely)
Instead of equivocal numbers, I would prefer to see a test setup with in- and output waveforms, and in case of doubt a specification how the SR numbers have been derived from the output waveforms. I measured slew rate @ 3dB frequency How to measure a time domain parameter at a specific frequency?
How to design a 3 Terminal Operational amplifier on Multisim 13.0 to show the slew-rate including improvements
I would expect Vo= 4Vpp at least as shown in spec. What is your load R? 100? Beyond 4Vpp that THD rises and slew rate well below limit , what about lower frequency response? Does it saturate the same? 109011
Any time you specify voltage, high speed and logic, one also needs to specify impedance of source, load , capacitance and current. The fanout requirements for 1 gate load are trivial compared to level translator for a clock driver with 20 loads. The slew rate of your Op amp is probably the limiting factor in your design. CMOS is a (...)
Could you explain a bit why slew rate is calculated by that formula along with that assumption? I know that slew rate is defined as the maximum rate of change of output voltage per unit of time and is expressed as volt per second. However, the lecture below give that formula without any explanation is a (...)
The datasheet for an opamp shows its frequency response and slew rate. The maximum gain of an OP07 opamp at DC to 1Hz is 1 million. At 1kHz its max gain is 1000. At 10kHz its max gain is 100 but the slew rate limits the output to only 8V p-p.
I need to calculate the Power Consumption and slew rate for a Two-Stage Unbuffered Op-amp 1. what should be the input parameters for these calculations? 1. Configure your opamp in your required application mode, with your real application load. Quiescent power consumption: With zero input signal measure th
what is your slew rate target. 2000V/us?
If the LM358 model includes GBP and slew rate, there should be an effect. You'll get the strongest bandwidth effect at low input voltages.
There are 2 parts to the total rise time delay namely, slew rate limited one which is totally decided by the output stage current, and bandwidth limited delay or ringing before settling, which is decided by gain of op-amp. In this case the slew limited delay is (8-4)/0.8=5us and the delay through op-amp due (...)
In fact, it depends on your application. Generally, opamp spec are: input range, output range, min supply voltage, current consumption, slew rate, noise, offset, gain, phase margin, bandwidth, PSRR, CMRR.
Hi I am trying to simulate Op-amp Apex pa107dp using ADS.Help me in trying to get various parameters like gain,Bandwidth,CMRR and slew rate
In my opinion, the datasheet gives all necessary information. You would want to apply feedforward compensation for optimal phase margin and highest gain at high frequencies. According to the bode diagram, you can expect about 10 dB at 10 MHz. You should consider that the achievable large signal amplitude is very limited due to slew rate (...)
Hi sgugan, 1) CA3130 - 10V/us slew rate , 15MHz bandwidth. 2) TL081 - 13V/us slew rate, 3MHz bandwidth , cheaper and easily available compared to CA3130.
Yes, you can obtain Vout max, min with DC sweep. But you can't have slew rate. It needs transient analysis.
CMRR and PSRR are defined as small signal (.AC) parameters in my opinion, slew rate is .TRAN as said, voltage swing can be either a statical (.DC) or a large signal dynamic (.TRAN) parameter.
I have designed a fully differential op amp. I do not know exactly how to measure the slew rate for a fully differential op amp. Generally for a single ended op amp we connect the op amp in non inverting(feed back) mode and measure the slew rate. How to (...)
I understand that when a large step input is applied to the op amp this causes slewing because the diff amp's input transistors are in cut off/triode. As you can see that the output after slewing starts to ripple. During this rippling the transistors are in saturation and the error voltage Ve is decreasing due to (...)
Hi, I just finished the study in op-amps design from Razavi's book. However, I feel not enough in some topics like CMFB, slew rate and some other practical issues. Could you recommend me any other books like Allen or Meyer so that I can study further? Thanks a lot! Wang
Hi see these papers: "Am imporoved model for the slewing behavior of opamps" by Wang, Harjani "An accurate analysis of slew rate for two-stage cmos opamps" by Yavari, Maghari, Shoaei regards
slew rate can be improved by increasing the output current capacity of the amplifier or decreasing the load capacitor....
The slew-rate of an op-amp is defined as the maximum rate of change of the output voltage for all possible input signals. where vout(t) is the output produced by the amplifier as a function of time t. slew rate is typically expressed in units of V/?s.
Hi In fact, specification of an Analog filter depends on application requirement. that is, if your filter does not have a large signal at its input, slew rate of the Opamp or OTA is not very critical spec. that is in most cases. to design Gm-C filters you can refer to John & Martin's book, Chap. 15. another good tutorial paper about (...)
The ideal op-amp For any input voltages the ideal op-amp has infinite open-loop gain, infinite bandwidth, infinite input impedances resulting in zero input currents, infinite slew rate, zero output impedance and zero noise. Regards, IanP
Hi, Measuring the slew rate in Cadence is similar to measuring it in other simulator. Close the feedback loop of the op-amp and apply a large step voltage to the input of the op amp, and measure the initial slope of the output. There is not a close relation between slew rate and (...)
read this short pdf. u could get some idea... it depends on the compensating capacitor
Hi, Does anyone know how to work out the CMRR (Common Mode Rejection Ratio), PSRR (Power Supply Rejection Ratio) and slew rate using Cadence simulator for a 741 Op-amp? Could anyone explain to me how to work out the differential gain of my op-amp using the Cadence calculator? Thankyou.