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62 Threads found on Non Overlapping
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 clocks, (...)
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 what is difference between overlapping and non overlapping sequence detector finite state machine ?? Check this link for understanding the difference between them.
Hi Does any materials regarding non overlapping clocks design?
Does any one know any circuit to do a non overlaping circuit using nand gates?
As you are designing non-overlapping sequence detector, if circuit is in E state and it gets input 0, it will go to state A with output being 0. You will write it as 0/0. Do you need any other help with state machines? All the best!
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
I presume you want to keep the existing gate drivers and supply non-overlapping, noninverted PWM signals from TL494 to the driver. The required TL494 output configuration is shown in the datasheet, it's about connecting pull-down resistors to the E1/2 pins to get a noninverted signal.
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
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 Double Laye
You might see alternatives with NAND and odd # inverters. The inverters set the majority of the nonoverlap dwell but the phasing has to give the logic what it needs for the active phase to be logically unique.
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
How we do overlapping and non overlapping checks with Temporal Expressions? Could you please explain with an example? Thanks in Advance
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
I'm looking at page 9.7-58 from: few questions: 1. Using the usual non-overlapping clocks, if both are off at the same time, figure b's op amp will become open loop. Isn't that bad? 2. Is figure c parasitic insensitive? 3. I
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
The description document that you provide explains pretty much everything with detail. If you want an overview of what is happening, I can tell you. Is a flyback inverter controlled by PWM, it has dead time control and non-overlapping provided by IC5/6/8. The IC1 is implementing an square wave oscillator which pulse width is controlled by the ne
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 has 23% duty cycle. The CLK3 goes high 2 ns after CLK1 goes high. CLK3 is ge
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
Dear fellows, I am designing a CMOS Dickson charge pump. The charge pump works fine when using ideal non-overlapping clock sources (vdc from analogLib). The problem arises when using a clock oscillator (or even an ideal source) and apply it to a circuit to generate the 2 non-overlapping clocks. When testing the clock (...)
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 clocks.
Can anyone help me? Why are three inverters needed to generate non-overlapping clocks? The 3rd inverter is there for obvious reason(advice: understand the logic and you'll see why). The 1st and 2nd inverters are there to make two clocks non-overlapping with a good separation margin(advice: consider the delay).
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
I assume you use non-overlapping clocks to minimize input dependent charge injection?
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
I have research in watermarking and I am confuse about which techneque should i use. can any one help me how i partition the image into non-overlapping blocks?
You need to drive your output switches with non-overlapping signals :wink:
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 7, .... (...)
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 I am trying to design a switched capacitor sampling system in virtuoso schematic editor. But I don't know how to: 1- Generate non-overlapping clocks. 2- How to model the switches? should I use like nfet or there are special switches? Thank you, M
Hi, I do chopper-stabilization in my circuit and I want to low-pass filter the output signal. I want to set the corner frequency of the filter to 100 Hz. In a normal first-order LPF it would mean 320 MOhm && 5 pF. I implement the resistor as a simulated resistor using two non-overlapping switching signals . The
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 drawn(20uA more
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 clock generation). I
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, I composed a schematic in Vituoso with 2 TG(4 transistor at all), these transmission gates are in series connected (from in to out). And between them, I placed a capacitor, lets say 10pF (or 50pF) to ground. The switches are driven from an non-overlapping generator( made by 2 'vpluse' sources, each one having T=5ns period). All is ok. From t
I am working to implement a human tracking system for multiple cameras with non-overlapping field of views. I propose to use multiple webcams for real-time acquisition and processing of the video; tracking the persons maintaining their unique identities; also making the system less effected by illumination, calibration, etc. Which software sh
it refers on what you want to test and your design (non overlapping clocks et.c for switch cap circuit et.c). Give more info. For the analog part, try sinusoidal signals in the input. For the digital part you can do it separately and verify with Matlab.
I don't think non overlap time or clock edges affects the CMFB very much. Is your feedback capacitor too small comparing to switches or the MOSFET gate connect to the feedback point? Can you detail the results?
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.
Pamela, the water has certain conductivity, did you take that in consideration?.... for other hand the model may not work if the whole "antenna" suddenly is inmerse in water. I think it should have at least non overlapping of structures of different materials, most likely is not your case since otherwise HFSS will give you a warning. Post y
Do you use non oversampling clock. Can you draw timing diagram?
hi friends, plz send me materials or links related to design a vhdl code for mealy and moore finite state machines for overlapping and non-overlapping binary sequence detector and its state diagrams. thanks in advance
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.
channels overlap in 80211b/g. there are only 3 non overlapping channels. channel 1, 6, 11. yes. BW is same, but channels in 5GHz don't overlap.
ISI symply occur due to non-ideal pulse shaping in transmitter and delay spread of the channel result overlapping other pulses. The way of reducing this is called equalization and there are many types of equalizers, i.e. linear equalizers (ZF, MMSE) and non-linear equalizers(DFE). To get an idea of ISI see the down to earth totorial (...)