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didn't work on a breadboard at 2Hz, 3, 16, 32, 64, etc., up to 16.7kHz, and changing passive components to fit frequencies, until I connected the NOR gates as inverters See how this compares to an led chaser I experimented with in hardware recently. It has output pulses overlapping, like your diagram. Counter to normal
Hi, Implementing a non overlapping clock generator (NOCG) is fairly straightforward. But my problem is that the generated non-overlapped clocks are not symmetric (On time of the two non-overlapped clocks is slightly different). I read somewhere that adding an asymmetric transmission gate will help having symmetric (...)
Questions of data rate or read/write address sequence are in fact involved, but apparently the OP has no problems in this regard, so why should we read them into this question? Dual port RAM can be also used to transfer data between asynchronous clock domains, as long as overlapping accesses to the same memory cell are avoided by suitable means.
How to implement/design 4 phases non-overlapping clock generator? I found this figure without enough details about the implementation. I need a clear reference to build the 4 phases non-overlapping clock generator or in general n phases non-overlapping clock generators for example a 3 (...)
Hi Does any materials regarding non overlapping clocks design?
hello everyone, i'm having trouble with this the output of my 3 stage cmos rectifier is 0.4 with input vrf = 0.25V, then if i connect the rectifier to a non-overlapping and self-oscillating clock and a voltage doubler circuit the output of my rectifier becomes 0.16V and the final output of my voltage doubler is 0.5V..but if i change the rectifier
Can anybody give me a circuit that converts DC(direct current) voltage to square wave with an input voltage as low as 200mV?...Tnx
Depends if you need non-overlapping clocks or not. If not, you could simply use the same clock signal for both transistors (like in a normal inverter). If the two transistors are connected in series, however - like in a normal inverter - you'll get current shot through during switching, what might not be important for a small inverter, but w
Hello sir. I am reading about lockup latches. Sir how exactly lockup cell removes the hold violation? And sir why we do check setup analysis in next clock and not at the same clock? If first clock for destination clock laging the source clock and during that time if data can settle then what will be happen? (...)
Hi, I am trying to unfix all the placed instances in my design and planning to do a refine placement to resolve violations due to overlapping. Please let me know the command that I should use to unfix all my instances. ( there is an option for unplacing instances "unPlaceAllInsts" linkwise do we have anything for unfixing??) Th
Draw the circuit diagram of a one-bit Dynamic Shift Register, based on CMOS inverters and transmission gates, using a 2-phase, non-overlapping clock. Briefly explain the operation of the circuit Modify your design such that it has a parallel input and can store data when the clock is stopped. Briefly explain its operation For a (...)
Hello All, Im not so experienced with non-overlapping clock generators so have 2 probably quite basic questions on them: Going by the topology of two cross-coupled NOR gates with even numbers of inverters inserted in their feedback paths: - Are the inverters inserted to increase the non-overlapping durations? - Could you not just (...)
Dear all, Is it possible to synthesize & verify a RTL latch-based design using DC? Or for latch-based designs, there're methodologies rather than DC? I know there's a way to create two non-overlapping clocks using create_clock, but not sure if DC/PT can verify the timing after PR, that the skew between the two (...)
You can see this material:Simulating Switched-Capacitor Filters with SpectreRF~I designed one 4th order switched capacitor biquad filter in UMC 180 nm technology using cadence software (version 5.10.41).This circuit is operating on a two phase non overlapping clock generator (i/p frequency = 1 kHz). To simulate this circui
Yes, that's exactly the circuit I mean. Non-overlapping clock would be preferred, but isn't necessarily required for digital circuits. Standard CMOS logic devices and usual ASIC libraries don't have it. As long as the input doesn't change during clock edge, there's no advantage of break-before-make action.
I think the second one can work too. I am trying to make a two-phase non overlapping clock generator for my SC integrator. can u plz tell me why people use such a professional clock generator as this (im
Hi XC, Non overlapping refers to H level. Note that td has a minimum of 0 ns. So, logic H's can not overlap. Regards Z
Hi, I want to make the layout of a non-overlapping clock generator. In that circuit i am using two delay elements each of which is a cascade of even number of slow inverters having small aspect ratios(20 inverters in series). Can i use common centroid or some another layout techniques while making layout of the delay elements? thanks in a
Hi fellas, I am designing a high speed track and hold in Switched-Source-Follower topology. But I don't know whether the clock signals should be non-overlapping or not. I have read a lot about the Switched-Capacitor type, and understand their clock signals should be non-overlapping. But what about SSF? I don't remember (...)
I have 3 clocks in my design. The third pulse clock is generated based on first clock.What is the best to represent this third pulse clock. CLK1 and CLK2(duty cycle of 48%) are non overlapping phase clocks CLK3 is a pulse clock that is double the frequency of CLK1 but (...)
A simple clock generator would be a constant current feeding into a cap and using a comparator to look at cap slope to Vref ~ compare and reset cap and repeat. This comparator then just flips a D flip flop which then generates your 50K clock. Then you make an non overlapping nand latch to make your phi1 and phi2. hope this helps Jgk
Does anyone have any tutorial about cmos tg dynamic shift register? I need an explaination how this circuit works. What I ment why this circuit only works with non-overlapping clocks, or why this circuit can't work with overlapping clocks? I need to prove why this circuit can't work with overlapping (...)
It looks like the OSC input just enables or disables the oscillators. If OSC=0 then the output of the first NOR gates is 1 no matter what the other input is, so the outputs will all be constant. If OSC=1 then the NOR gates on the left simply work as inverters. Then you basically have a ring oscillator with six inverters, where outputs are taken fro
Dear Friends, I am designing 10-bit SAR ADC. The blocks comparator, DAC has been completed. But I am fully unaware of, how to design the digital control circuit. Even I have tried with shift register, ring counter, D-FF , Non overlapping clock and gates. But couldn't succeeded. Even I am getting the problem in understanding the timing function f
If this is to be implemented inside an IC and assuming the following (a) clock is of the order of MHz (b) This is a really good Foundry process then.......... Feed the clock into a non overlapping clock generator that generates two non overlapping phases. This can be done with two NOR gates and 3 or 5 or (...)
The non-overlapping time is the delay through the chain: td(NOR)+2*td(INV). If you want to decrese it, remove those two inverters.
Hi All, I am designing the non-overlapping clock generation block now for sigma delta ADC. Since our sampling frequency is low (~1MHz) and our technology is fast(0.13um), it's kind of difficult to seperate the clock edges. One way to increase the delay is to use big capacitor on the signal path, but this increase area and current (...)
you can simply use a t-gate as switch sampler for a sampling cap. :) however, you have to choose correct sizing for its transistors (to minimize clock feed-through, charge injection, and any harmful effects); a true clock must be defined, preferably a non-overlapping one with real rise/fall times (I suggest you using of real (...)
i have to use of Non overlapping clock for S/H.all pieces of this project is real thus i must define real pulse source that have rise and fall time.i don't know that how specify these times,can we define percentage of pulse width for rise/fall time? (for example define rise time=0.1% Pulse width)
Hello, guys I would like to know some materials about current spikes resulting from overlapping clock. Want to figure out the reason or analysis. Thanks.
What is the real or optimum value of the non overlapping time of the two clock phases in a switched-capacitor CMFB circuit used for an integrator? What about the rising and falling time of the clock? Does it have any relation with the clock period? In my simulations the non overlapping time has a great (...)
Just use two non overlapping clocks to switch the switches on and off .hence the input signal will get modulated ie multiplied by a square wave n in the output again use a similar pair of switches to turn on and off which is equivalent to the demodulation operation.
non-overlapping clok may be problem. show clok phases.
You can use Switched-capacitor type with non-overlapping clock for up to 13~4bit resolution.(two stage opamp or gain booster) For more resolution, you can use gate-bootstrapping technique. There are many helpful thing in S.Lee 's thesis.
The sample and hold colck should high level no overlapping. and check the sample timing, CM switch should turn off first then sample switch turn off and then hold switch on. that can reduce the charge injection and clock feedthrough.
Hi, Can anyone provide me the reference to generate the non-overlapping clock generator (with earl phasing) and a divide by 8 circuit? thanks rampat
I need three phase non-overlapping clock paper or other material, not two phase. I can not find anything about three phase non-overlap clock, could you please share yours? Thank you!
hi frens... can anyone plz tell me how to construct a pseudo two phase non overlapping clock generator using cmos transmission gates or using 2 input nor gates...
A popular clocking scheme is the two-phase clock, which consists of two signals called 1 and 2 that alternate being on and off .These values are generally nonoverlapping such that they are never both on at the same time (one must go off before the other goes on).
from a single phase clock how to generate a two phase differential non-overlapping clock...
i need schematic & W/l values , Trade off between speed & powerconsumption
1)Non-overlapping clock. How long we have to design the time gap between two phases. For example, the clock frequency is 1MHz, how about 3nS time gap? it's enough? 2)The common mode bias to switch Can we only use resistor divider to generate a voltage to bias the common mode node of switch? or, we need to make a low impedance to the (...)
But, the non-overlapping clock generates the non-50% duty cycle inherently. The sampling peroid is not equal for the two phases. How about this effect?
Hi ezt, Thanks for your input! If we do not consider the overhead of two-phase non-overlapping clock and suppose the gain accuracy is not very critical, what is the criterion of choosing opamp structure between sc circuitry and conventional method ? regards, jordan76
As far as I can see, you have two options to solve the problem: 1) Digital solution: digitize these two inputs and perform the subtraction in digital domain, or 2) Use switched capacitor circuitry with two non-overlapping clock phase to get the V1-V2 function you required, if the sampled nature of signal processing is allowed. Other pure ana
I have a SC integrator implemented with complimentary switches. I use non-overlapping clocks. Does it matter if the complimentary clocks overlap. What i mean is, the complimentary switch runs on two clocks that are the inverse to eachother. ie. clock and then clockbar. So in an integrator (...)