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41 Threads found on edaboard.com: Response Time Comparator
hi ,every one now i have to design a comparator with 5mv offset and 40ns response time.what i want to ask to you is how i can measure the response time and offset with hspice. as far as i know,the comparator's response have two ways that is linear and slew depending on the (...)
For a NMOS open-drain comparator circuit, how to reduce the ?response time High to Low?? Thanks.
Any idea where I can know what's the response time of the analog comparator inside the AT89C2051? It does not seem to be mentioned in the datasheet anywhere!
response time is a typical parameter to specify components with digital output, e.g. a comparator. It's no commonly used term for OPs.
The LTC1841 commparator has a propagation delay of up to 14us LTC1841 DATASHEET How can this be? ...i thought comparators were supposed to be fast? The LM393 has a response time of 1.4us LM393 DATASHEET: ....The 14us seems ridiculo
Actually, I am using a latched comparator in my switching reg controller now. It has some very good points in its favor like a 30ns response time. But the main disadv I have noticed so far is its resolution/accuracy. It's not its strong point! More info on latched comparator: check following IEEE paper, "Design (...)
The following is a comparator datasheet: How can simulate Ioh,Vol,Icc,tPLH,tPHL of this comparator? Can anyone tell me how to add stimulus in the hspice netlist? response-time measurement at low input signal levels can be greatly affected by the input offset vo
This is because normally opamp has compensation capacitor which will slow down response time of the output or the rising/ falling of the output. As comparator, you no need it because it is a open loop system. Correct. The most popular OA, the 741, had a version without the compensation capacitor (if I'm not wrong, it was
I think response time is also extremely important (especially with faster switching speeds) and hysteresis to prevent multiple triggering caused by noise.
Hi everyone I know that traditionally, an op-amp connected as a comparator consistently underperformed dedicated comparators in most respects. But that was when we were comparing a 741 and a 311. Op-amp technology has progressed faster than comparator technology. We have today op-amps with exceptional speed, which I would expect to (...)
I think , you should simulate the settling performance of the SHA first. then you had better simulate the offset of the comparator. however, to simulate the offset of the comparator is very difficult task. I think you should design it and layout it carefully. normally, the monte carlo simualtion can assist your analysis. the response (...)
I believe you can increase the tail current to decrease the delay (what is your clock frequency?) of the output response or you could latch the output of the comparator with a delayed version of the sampling clock, say 160ps later. If neither is good for you, add a preamplifier or change the comparator topology.
Does response time of a comparator in the datasheet means the time it takes the output to see the change of the input? and the slew rate is the time for the output to change its state? if i am correct about the response time, is there a way to improve it? thank you
does any one help me in designing the comparator? what are all factor need to be checked in designing the comparator.how can i reduce the response time of the comparator.
Hi all, I am performing humidity measurement using the HS1101 sensor. The idea of measuring the humidity is charging anf decharging the sensor(capacitance). Please look at the link As it is written in the link above, the solution is based on a timer which charges/decharges the cap
Unless you have slowed down the op amp with capacitors. There is no way that a thermocouple will be faster than an op. The time that the heater needs to warm the metal rods (when the heater is on) and the time in which the rods cool down (when the heater is off) produces a delayed response much slower than the op amp is capable to react. Can (...)
BIST consists of *)DUT *)PRPG-> Psuedo random pattern generator *)response compactor *)comparator *)Memory for storing the expected results PRPG pumps in random data to the DUT. DUT response is compacted and compared with expected response for corresponding to that particular input. The expected results will be (...)
Generally speakng 339 is not very precise comparator with average response time, so you can easily use 324 instead. The only difference will be that you can connect its output to larger voltages then its supply because of the OC output stage. On the other hand, you can not replace 324 with 339 in linear applcations because 329 as (...)
comparator response can be improved by adding hysterisis equal to or greater than amount of largest expected noise amplitude. Ways to introduce hyterisis is by external method and internal method.. Maybe the speed is better with internel method coz it does not require external feedback.
Given the fixed input waveform signal, e.g. full swing square wave input is applied to one input of comparator and another input is fixed voltage, then you can observe how long it takes to response.
the comparator has a good offset(≤1mv) and a fast response(maybe :cry:) to the input pulse, for instanse, when the input- is holded at COM, the input+ is a step pulse very fast the delay of output is about 200ns. When the input- is holded, the input+ changes very slowly, the switching point equals the voltage of input-. But if the speed o
It is usually not same. comparators can have internal positive feedback that can make faster switching and response time... and so on... Here is what you are interested in:
All I know is that comparators are used to compare signals and they are very important therefore are used in many types of circuits. So how are comparators used in these circuits? What makes a good comparator in different application? Is faster response time and larger output voltage always better?
Hi, I found there is a specification of "response time" or "rise time" with the test condition of "100 mV Step with 100 mV Overdrive" in the datasheet of the comparator. Anyone would pls. tell me what it mean? Thanks
Hi all, Table 8.2-2 of Allen?s book <> gives us a procedure to design a two-stage open-loop comparator for a linear response, in step 3, there is a equation I5=I7(2CI/CII), but I really don?t know how and from where can I derive it, your suggestions and time will be highly appreciated. Rgds, Terry
Well first if you want to design 40 Msps-12 Bits SAR ADC, you need 480 MHz takt. That means your comparator, and your DAC need to have 2.1ns response time totally. That is quite a problem. Second you need to design "12 bit good" comparator (regarding offset) and 12 bit good DAC (regarding matching) which is also very big (...)
Hi, I am calculating the steepest slope for the output time response of the the two-stage open-loop comparator. From the book (Allen, P.448, Eq.8.2-13), it says I need to find it by differentiating the equation of time response twice and setting the result the result = 0. Why??? I know the slope can be (...)
Try another speed of the triangle during transient simulation - and you will most probably see a voltage difference even other than 283 mV. The reason is that during Tran analysis all time dependent elements (in particular: capacitances) are considered - opposite to the dc analysis. Thus, all delay effects of the realistic amplifier model influence
LM393 is a comparator so Gain-bandwidth is irrelevant. Large signal response time is 300ns, small signal 1.3us so for 50kHz you will be fine. Keith.
i asked the tutor he said its the delay of the 555timer and flip-flop. that caused the phase shift between flip-flop output and comparator output. Doesn't sound reasonable. 4027 and 555 have delays in < 1us range, even the comparator response time is much faster than the delays viewn in your waveform. The (...)
I think the most important spec for your opamp and comparator will be offset voltage. There's not really a 'gain' for the integrator, there's a volts/sec constant, and that's going to depend on your requirements. In industry standard dual slope circuits, integrator and comparator offset voltage are eliminated, that's why these circu
For short-circuit and overload protection you need currrent sensing methods. For short-circuit protection the response time must be very quick in order to prevent damage to the MOSFETs. For overvoltage protection, you can compare the scaled down DC voltage to a fixed reference and latch the output which will shut down the IR2153. Hope this helps.
What makes you think that you can get away with 0 delay? The datasheet says Typ. response time TRES 200ns
Nominal Resolution of dual-slope ADC is usually referring to the resolution of the time measurement of de-integration phase and is simply given by your hardware design. Usable resolution is a matter of various error terms and more difficult to determine. Ponts to consider are - integration capacitor loss factor - comparator response (...)
Hi, In ocean script, I am trying to if clock is = 1 and output is = 1 in an transient response, then get the x-value. From that x-value, get the y-value of input. I am not sure where to start. I don't think this is right, because there is no timing information. If( (VT("/clk")==1) && (VT("/Vout")==1) ....) Anyone can help me solve this
Hi can you please give me some quick tutorial on how to start designing differential comparator? it would really help me. thank you in advance. hi, thanks for your interest in this topic... first of all you must know what a comparator is.... for example ... op-amp can be used as a comparator...
I think your system is slow in response. Because you are waiting one(or a bit more) revolution to compensate the speed error. And until you reach the desired speed, a lot of time passes. Also i wonder how do you adjust the speed. I mean if the motor is slow than you expected than you need to increase the duty cycle. But how do you decide how much y
There is no such definition, You might be confusing propagation delay and VIH. When you apply a signal at the input it takes for a while for the output to respond, But at the same time if you keep increasing the input, you might think that the input value at the time of output signal is changing state is VIH and/or VIL, this is not true. T
You could use LEDs of different color to shine in turn (not together) on the sample paper. An ADC will convert the response of a light sensor, for each color, to values between 01 and 255. The combination of those values will identify one paper "color". As far as I know, the disadvantage is that every time you repeat this circuit (build a
If you got the correct model, you can break the loop with current feedback loop closed. Then you got a bode diagram that push LC poles to the high frequency. You can series connect a resistor and a cap to form a zero. You also can obtain another zero by parallel connecting a cap with feedback resistor divider. With enough zero, you get the loop sta
100MHz to 1 GHz high switching speed would imply a comparator that converts the sine to a square wave. I understand, that you intended a rectifier or RMS detector however. It would have switching delay clearly above several 10 ns for a simple design. Accuracy may be improved by filtering the measurement with a higher time constant (us and above)