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1000 Threads found on 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 (...)
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!
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
I am really confused between two parameters in the comparator. The Propagation delay and the response time. I understand that the Propagation delay is the delay from input to output That's correct. response time, however, is the time, which is necessary for an input signal to stay in (...)
For a NMOS open-drain comparator circuit, how to reduce the ?response time High to Low?? Thanks.
response time is a typical parameter to specify components with digital output, e.g. a comparator. It's no commonly used term for OPs.
hi,guys I'm designing a UHF diode detector,the diode's output voltage's response time(rise/fall)time should be a few ns;I searched some functions,they said the Rv or Rl of a diode should be decreased,but If Rv be decreased,then the Ib should be increased,but IBV has a limit. If we decrease the Rl,normally the Rl should be amout of (...)
I am quite new to PLL design and analysis and have what I hope is a simple question to somebody. I am developing a system that will use a PLL to track the resonant frequency of a small micro-beam around 26 kHz. I would like retrieve the frequency to within 0.01 Hz resolution. Using canned formulas in the literature and text books, my "lock i
how to calculate the response time of RC low pass filter,the frequency of the filter is 100Hz,R=15.9kΩ C=0.1?F
Hello everyone! I want to build a continuous time comparator (one input seeing a threshold and the other an integrated current on a capacitor, so a rising voltage), without external clock. So the basic comparator used in ADC is useless, cause it needs the fast clock to reset it and make it take a quick desicion with the positive feedback. I (...)
hiiiii all, i am working on Class AB power amplifer, problem is that the Output Power at load settles constant after long time, how to improve that response time.
ASR ADC Segmantation msb 6bit with CAP binary weighted, lsb 6bits thermometric resistor ladder data rate 2Mbps, 28Mhz clock. continuous-time comparator(signle stage opamp) with two cascade satges used autozeroing technique for offset cancellation(with i/p cap of 100f/500f) when i run enob simulation only with real comparator and (...)
Consider a totem pole driven Class D and another one with out totem pole drive and ponder the following questions in my mind 1.Which of the two will have higher response time ? This is my take in it The one with a totem pols drive has a higher levels of BJT so it will have higher response time 2. For a high speed (...)
The passive HPF has no effect on initial response time (to a step function from the sensor). The LPF is first order, and so it reaches 63% of its ultimate (gain=101) value in 68 msec. (which is 680K x 100nF). But by this time the HPF is starting to fall off too, so it starts heading back toward zero with a time constant of (...)
Guys I found an led (visible range) with a response time of 20ns does it mean that it will support a switching speed of 25MHz. Also if true are there any leds with lower response time in range of 1-10ns. Cheers.
Sensors and Couplers To measure a Step response time, you measure the time from the start of the rise until the output decays to 37%? Step response time is to measure sensors and couplers? Any of circuits or components uses step response time? When would a tech (...)
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 (...)
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 (...)
response time can be understood inertial time
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 (...)
agump, To get the frequency response of a filter (or any linear time-invariant system), simply sibstitute jw for s in the transfer function. . To get the step response, multiply the transfer function by 1/s. Expand the resultant expression using partial fractions, and then obtain the time response using (...)
Hi, I've just read Gregorians book "CMOS-Opamps and comparators". In chapter 8.3 he introduces to a sample design of a regenerative latch based comparator with hysteresis. On the last page of the chapter (p. 354) he adds that one might optimize the sizing of the W/L of the mosfets for transient response but he doesn't go into detail - 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 built a peak detector circuit for an ultrasonic receiver circuit. few days a go the response for the output of the peak detector is fast enough that it really follows the up and down of the receiver. now suddenly (no hardware or software change) the output of the peak detector's response is slower than before, it takes nearly 3 seconds for th
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 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
It depends upon the load you want to drive and how fast you want a response. You should keep the output sink current to no more than 8mA so the smallest resistor you can use is R = Vs / 8mA where Vs is the voltage to the resistor. The largest value depends upon the load and the response time you need to drive the output load stray (...)
I simply do not share your optimism about response time and whether that's fast enough to save the converter. So I still recommend you dig until you find a threat model for load dumb that some of these "authorities" have seen fit to bless. They want compliance, to something. Bet on that, and find it. Then you can set about proof. What I see in a c
WIthout seeing the circuit, the problem with this design is that the photodiode appears to saturate with 3V across the current sense resistor and then the recovery time is extended, also as the current drops the RC time constant increases The second problem is that the filter BW should match the signal content for optimum SNR to reject ripple. Som
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 (...)
Your need fast Si photodiode with 50 ohms oscilloscope load. If expected rise and fall time is in nanosecond range PiN photodiode is useful. If rise and fall time is in picosecond range ( laser sources) your need avalanche photodiode. Look at Hamamatsu photodiode catalog and application notes- response time for fast (...)
Definition: A soft real-time system is one in which performance is degraded but not destroyed by failure to meet response-time constraints. Definition: A hard real-time system is one in which failure to meet a single deadline may lead to complete and catastrophic system failure.
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, If I remove the inverter stage (in red), the output will be inverted. i.e +ve to -ve and -ve to +ve. However, my transient time also suffers. why is that so? I have tried to tune the remaining transistors to obtained a better transient time but was not successful. Does any one known why?
Usually it is 100mV step with 5-20mV overdrive .. Step represents the voltage change necessary to switch the input differential stage fully from one state to the other .. To understand what an overdrive is read the following quotation: If the input voltage to a comparator is more positive than the reference voltage plus the offset?VOS
Hello guys, I want to design a comparator with the following restrictions: Vdd=5V total quiescent current is 10uA Vref=4.99V and the propagation delay should be around 20ns I do not want to use the dynamic comparator because there is no clock signal in the whole system where the comparator works. Can anybody give me some suggenstions? (...)
Maybe you need a large external Capacitor to imrpove tansient response!
Hi, all I am designing a latched comparator (dynamic type). How can I set up the simulation to get the performance in offset and speed?? I also need Monte Carlo and Corner model verification. Thank you. leg1234
Hi, I'm going to design a continuous time comparator using non-compensated op amp. So, how to implemented hysteresis for this comparator. Remember the op amp itself will have some offset. Thanks!
Hi I've a question about comparator type, In general, there are 2 types of comparator.opamp type vs latched type Latched comparator is more power efficient, small size, fast slew time than opamp type. Then what kind of application does need opamp-type comparator?
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 (...)
eem2am, In general, it is not possible to control the switching of an electromechanical relay so that it only switches at zero crossing because the response time of the relay is so slow. You can increase the life of a relay by using a relay that has a current rating much higher higher than the expected peak current. Regards, Kral [col
how the effect of pole is observed through time domain plot ? The pole position influences the response time of the step response. A rising pole Q shortens the rise time and can create ringing - until the system oscillates when the pole has no real part.