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I need papers on CMOS ring oscillator design with simulation examples having specification to device sizing.Can anybody help plz????????? Thanx in advance swagata
hi all, i'm undergraduate student and I need papers on CMOS ring oscillator design with simulation Examples or how can i design it using 3 stages common source amplifiers thanks in advance :)
Can anyone offer me tips on how to size the transistors for the buffer stage shown, particularly the PMOS transistors because I am having a hard time keeping PMOS load in triode and PMOS diode in saturation. I am trying to build a four stage ring oscillator. From my calculations I need at least a Gain of 1.4 in each delay cell and I am target
now i need design one CMOS CSA ring oscillator,using 0.25um technology,VDD=2.5V, Vctr increase lined from 0.5v to 2v ,the output signal frequency should be 500Khz to 80Mhz,i should how to design this circuit. now i design one initial circuit but when Vctrl from 0.5v to 2v the output frequency form 10mhz to (...)
I plan to design a 10kHz around ring oscillator which dissipate only uW level power. Is that possible? How can I do that in CMOS? Thanks!
i am designing a ring oscillator in cadence 614 using gpdk library.how can i can calculate the oscillation frequency using the calculator tool in the spectre analyzer.i have used the freq function but it is giving me a linear plot of frequency vs time that freq. is not constant .it's varying linearly with time. though the variation of frequenc
I'm not familiar with Cadence Virtuoso, but a quick Google search presents this result: Click here. In this tutorial, the author is simulating a ring oscillator as well. If you want to skip to the part discussing initial conditions, just search the page for "initial" and you'll
You can use NAND or NOR gates in place of an inverter to connect an enable signal. The said 6 ns is the delay of a buffered inverter that's comprised of three inverters internally. Thus in chip design terms, the number of inverters required for a 3.5 MHz ring oscillator is higher.
Hi I need to design a ring oscillator on FPGA. I create it by a chain of inverters and one AND gate for reset oscillation. There is no problem in simulation but when I program FPGA, it doesn't work and I don't know why!! I use IGLOO Actel FPGA. Please guide me. thanks
Can anyone offer me tips on how to size the transistors for the buffer stage shown, particularly the PMOS transistors because I am having a hard time keeping PMOS load in triode and PMOS diode in saturation. I am trying to build a four stage ring oscillator. From my calculations I need at least a Gain of 1.4 in each delay cell and I am target
Can anyone please suggest a paper or reference that talks about designing a cmos ring oscillator which uses a variable supply voltage to vary the frequency of the VCO. Thanks,
Hello, I'm implementing a ring oscillator at 10MHz with cmos inverters and transmission gates in between which are controlled by control voltage. But when i simulate in spectre, i need to set initial point otherwise all inputs and outputs of inverters stay in mid-rail. how can i build up a start-up circuit for this vco? or do i need one? would it
u know from the basic equation of the ring oscillator that the F depends on the N * the delay of the single inveter where N is the number of stages , so u should check the propagation delay of the inverter and then use it to get the number of stages required to get this frequency if u want a ring VCO ,, then u should see how will u (...)
I am trying to build 5 stage single ended ring oscillator in simulink(matlab). How to set propagation delay of each stage inverter to get the desired frequency? also what parameters to set for pmos and nmos L,W, Kp,Kn,Vt etc. I have taken some values from research paper like (W/L)p =5/2, (W/L)n=3/2, vtn=0.6 V and vtp=0.53 V, tox=25 nm , Ld=0.1u
I'm designing a ring oscillator VCO which can be low performance, since I won't care much about phase noise or great frequency stability. However, I will need a very wide tuning range of something like 1 MHz to 2 GHz with minimum amount of control signals (so simplicity is desired). Also, I don't have much concern about power usage. When (...)
Hi, I am designing a ring oscillator whose output frequency is not sensitive to process and supply voltage variations. In order to do this i made the following current controlled ring oscillator. However, changing the bias current does not change the oscillation frequency of ring (...)
Can someone give me the underlying theory to create (i.e., size and bias) a delay cell (a total of 4 delay cells in the ring oscillator). I am using 0.18um technology and I don't know what an appropriate bias current is for the cell, I don't know how to set output swing. I want to design for an fo of 2GHz. In the diagram VDD = 1.8V. Based (...)
How to design a low power and low process variation ring oscillator? :!:
how to design a three stage ring oscillator, if only the first stage has a capacitor and the other two stages has no capacitor?how to choose bias current of first stage, capacitor of first stage, W/L of all transistors? for 1M oscillation frequency. is there some design methods or some advice? and how to measure its loop (...)
I am new in the field of Anaalog ICs. and i was assigned to design a ring oscillator using differential topology but i face problems in adjusting the oscillation frequency and estimate the bias and current needed. Can you please guide me from where could i start and how to achieve the maximum oscillation frequency
Yes you could design a full-swing ring oscillator and use a resistive divider at the output for reducing the swing size.
hi i would like to design a five stage ring oscillator using CMOS differential amplifier by cascading .But the problem exist is when the differential output voltage is Vdd then at this point the load pmos transistor(which is controlled by a contolling voltage) will enter into the saturation stage but we are trying to model it as a (...)
Hi all, I am new in the field of PLL design and i want a clear answer about ring oscillators. I have read some papers (especially Maneatis's papers) that the VCO core consist of "differential delay buffer stages". The term "differential delay buffer stage" means that the VCO core does not need an output buffer stage? In other word
My experience has been that ring oscillators draw more current and have worse phase noise than LC. ring oscillator Q=1 so phase will always be better with LC.
Basically, it is difficult to suggest a way to control the output amplitude without knowing the structure of you delay cell in the VCO. Having an amplitude not dependent on the tuning is a good idea since it makes the transfer characteristic of the VCO more linear. Are you using something like Maneatis ring oscillator? As for converting the sin wa
Hi, I am designing a differential ring oscillator using 0.13 technology. I used four Maneatis symmetric load delay cells. I can get it oscillate ( around 2-4GHz). But the phase noise is always very large (around -60dBc/Hz at 1MHz offset). Thank you.
Of course the main problem (and advantage) with the simulation is the fact that a ring oscillator has a Q of 1 or less than one (Q= energy in/energy out). The reason being that there is virtually no charge storage from cycle to cycle. The result of this is that the proposed oscillator is delightfully dependant on the device models and the (...)
The formula takes into account just a small number of variables to demonstrate the oscillation effect. However, during simulation, spectre takes into account many additional things like transister (inverter) sizing, parasitics, wire delay, transmission line related effects, loading etc. You are better off trusting spectre. don;t forget to do the
i'm in real need to know how to design a ring oscillator that produces a square wave and how to tune it over a wide frequency range from few hz to 100's of khz? Are the any papers that talk about ring oscillators design?? and i also need to know if there's another circuit that can (...)
What is the best topology for GHz ring oscillator with low power and low phase noise? Do advise, cheers!
.. or read my tutorial at Cheers Ody :D
Hi everybody. We are currently using MOSIS IBM 0.13um with Artisan std-cell libs (Digital FLow). In our design we need to insert a Clock source, but we don't have the time and the skill to design a PLL. What we would like to do is to design a ring oscillator using std-cell inverters. I know that (...)
Dear gingerjiang i have check ur circuit , it is good , and the nice thing about it , that u change the delay of the inverter by changing the load capacitance by the varactors used mine is by changeing the current , i donot know which one will give u wide tuning range , u have to check it by simulatin , also u have to check the phase noise p
Maybe you can simulate one cell at one time. Is your ring osc for VCO?
do u have models for the 90nm process and , do u want to design differential ring oscillator or single ended khouly
regarding a ring vco, am i right in thinking the oscillating frequency is inversely proportional to the number of stages? what difference will it make having 15 stages compared to having 5 stages?
can i use ring oscillator for blue tooth tranreceiver
Hi,everybody, I want to design a oscillator and the frequency is about 40MHz,the current is not more than 50-60uA,if use ring structure,the size of transistor should be small enough because the current is too small,but the stability maybe a issue,if use a PLL,the power comsumption may be larger than expected,I am not sure which structure (...)
To operate as an ring-oscillator, the structure must have a gain above unity with 180° additional phase shift. This requires either two integrators or three poles and sufficient gain. So a single inverter would need additional low pass filters no meet the oscillation condition (if the gain would be still high enough then).
Hi , I am working on .13um process. I designed a single ended ring oscillator. I need to know how to calc. the gain i.e. Kvco.?? At supply voltage of 1.2V this VCO runs at 1Ghz, at 2V this goes till 2Ghz. Now how do I calc Kvco. Any help will be great. If I am targetting 1GHZ/1V then what i am supposed to do? This is the first time I (...)
Hi all Did any of you have experience on ring oscillator VCO design? I want to push operation frequency of ring oscillator to over 10Ghz for 0.13 technology, but simulation have problem, did anyone have experience on this? Is it possible to generate a ring oscillator VCO (...)
I guess the ring oscillator is common one .. and M5 is just to enable / disable the supply. Raduga
Hi Shawn, As erikl suggested you can use the idea of generating a ramp and comparing it with a reference to generate a clock (oscillations). You can also generate a clock using a current-starved ring oscillator (ICO). You can refer to Jacob Baker's book "CMOS Circuit design, Layout and SImulations". Regards, RDV
Does anyone knows how to design 5-stage CMOS ring oscillator? Problem: Calculate the oscillation frequency (f) from your SPICE output waveform. Need to use code(txt file) to import LIB,then show the simulation. Thank you in advance!!
Hi, I am trying to design the same. Attached is a document that shows a differential ring oscillator. Did you get a simple single ended three stage oscillator running? Try that first to see if you can get it to oscillate. It is a simple circuit with three inverters in series and the output of the last inverter (...)
Hi Guys, I am trying to design a symmetrical load ring oscillator using the self biasing circuit shown in the maneatis paper. Attached is a schematic showing the self bias circuit. My question is, it shows an OPAMP. How do I design this? Do I have to design each individual stage of the opamp (buffer + (...)
It's just a logic cell delay chain. You need to use tool specific synthesis attributes to prevent the design compiler from removing redundant logic cells. Altera has a design cookbook, also covering true random generators:
Hi How can I design an oscillator in subthreshold region? Is it possible to have a ring oscillator with fc=200mhz ? Tx
Hi, I created ring oscillator simulation in Cadence Virtuoso . the ring is made of : INVERTER >>INVERTER >>NAND3>>NOR>>INVERTER I pull one of the NOR's gate input to gnd , and 2 of the NAND inputs to vdd so the gates will behave as inverters . I have some very weird problem with my design , I get the fastest (...)
I am a beginner of PLL designing, I want to read some good papers about ring oscillator. Can anybody recommend me some papers about VCO design? Papers can be from architecture to circuit design details. Thank you in advance!