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148 Threads found on edaboard.com: Oscillator Inverter
Why don't you get a 150Mhz crystal and create a transistor oscillator. Than it will be Sine wave.
According to the error message you are trying to build a ring oscillator with delay-less inverters. That's not possible.
Hello, I have a three stage ring oscillator that oscillate with 1GHz. each delay is a simple inverter. I use a tri state inverter in parallel to the first delay stage in ring structure. The frequency difference between two state of connecting and disconnecting the tri-state inverter is limited to 50MHz. Even the w/L of (...)
Your circuit is missing the important RC that sets its frequency.No. Ring oscillator does not require such RC. Cascaded inverters of odd numbers cause oscillation if a loop is configured by them due to propagation delay of inverter. So I have this 3-stage ring oscillator of which I h
Hi all, I have a 5 stage ring oscillator and a comparator based RC relaxation oscillator. I want to analyze both of them on these following factors: My freq of interest : from 5MHz to 25Mhz. -Power -Freq stability -Variation across corners etc. Which one is more suitable for my application? Any good differences between them? Relaxation os
Synchronized N=5 ring oscillator as part of a PLL, pick the tap you like?
Hi, I wonder if you come up with an idea!:shock::idea: "resettable ring oscillator". Does it make sense?:bang: Would you know if it is feasible to design a resettable ring oscillator? If so, how to do it? How does it work?:razz: Best,
A ring oscillator with an odd count of inverters will always oscillate, because of the 180° phase shift. If you want to add phase shift to your Verilog-A inverters, perhaps this example could help, s. pp. 199 ff.
Its internal configuration is so that. It may be used as a inverter ( for instance ring oscillator) or anything else.,.
The phase shift oscillator is not resonant with the load (11.2 kHz Q=3 ) Can you tune the oscillator or do you prefer to resonate with the load instead.
A CMOS inverter ring will vary a lot with Vdd. About the same ratio as your IDsat (since capacitance changes not much). A bare ring oscillator can be tough to test especially at probe, the edges against bondwire or probe inductance can make the ring unstable (kill oscillation, etc.). Well designed ROs may have a high #bit counter appended to help
Usually a cheap squarewave inverter (12VDC to 120VAC or 230VAC) uses a squarewave oscillator to drive the Mosfets.
Hi all guys, I am trying to make an oscillator using CMOS inverter for quite some time and it won't oscillate at desired frequency. I want to make 125 KHz oscillator using following schematic (the element values are not relevant for desired frequency): 111933 The circuit simply won't oscila
A transistor needs base bias voltage and current for it to begin to turn on and amplify. A Jfet is already turned on and amplifies when it does not have any input bias voltage. There are hundreds of schematics about your Hartley oscillator in Google Images, some of them work. Some of them show the transistor with no input bias so it will not wo
hi, it's an inverter circuit which produces high voltage . Basically an oscillator driving a step up transformer (the sealed box )
I have a four terminal crystal oscillator. The four pins are: Vdd, GND, Enable, OUT The frequency output is wrt Ground. Microcontrollers have two terminals for oscillator input, and the oscillator is supposed to be connected in a floating manner across the two pins. However, since my crystal-oscillator output is wrt (...)
Hey guys. I recently found that a MCU's built in oscillator failed whenever the device went anything under 0 degrees "Celsius" The Osc worked in LOW power mode and it was at 20Mhz. When we divided the clock with anything above 2 it seemed to work fine. Now this is weird since if you divide the clock it doesn't necessarily mean that the osci
Hi all, i wonder if anyone can help me! im using proteus which ive used for a while but never really gone into the simulation side of it. Im having some trouble getting oscillators to run?! ive tried various op amp and logic gate oscillators and they just sit there showing their original state. Ive tried graphing the output and using the oscillosco
... i need the load capacitance at the output of a inverter in a 3 stage ring oscillator in a specific temperature The load capacitance at the output is the capacitance by which you load the output - so it's up to your application ;-) also i need the oxide capacitance at
I'm unsure about a question in my lab homework which the book doesn't seem to address. Maybe I'm missing something simple. The question is about a ring oscillator produced by connecting 5 of the inverters on a 74HC04 in series without a load. Vcc is 2V and the measured output frequency is 5 MHz. The question is: What is the capacitive loading
You are WRONG. One inverter provides a phase shift of 180 degrees and 3 RC stages provide 60 degrees each. Then the total is 360 degrees. You can also use any odd number of inverters. A Budda oscillator has one inverter and four RC stages of 45 degrees each for a total of 360 degrees. One RC is difficult to make a phase (...)
High I need a sinusoidal ef power generator circuit operating in class-E (for high efficiency) in the range of 35-100KHz 5-30W or so. just a power oscillator, not a generator followed by an audio amplifier. Any propositions?
okk sir thanks a lot , i observed it needs relaxation oscillator , so i need too a compatible one. Would you please let me have a relaxation oscilator's using simple 555 or 741 or 358 etc etc thanks
Hi, I am trying to simulate an oscillator using 7404 inverters in OrCAD. However, I cannot get any oscillation with any combination of RC value that I use. Can someone check my schematic? Thanks.
When I turn on the bridge I get a square wave out, but its a bit jittery and the transformer crackles. Might be due to an unstable control loop, or if the inverter is operated without feedback, an unstable oscillator circuit. Less likely a problem with a power electronic component. The cause is magnetostriction.
A simple inverter IC, such as TTL
dear all can we design inverter by a oscillator then to step up transformer. oscillator operates at 12V DC and generates sine wave of 2Vpp having 60Hz.
It's been a long time, but I believe the 8051 needs either a crystal or an external oscillator, you can't use an RC like the PIC. But you can make a pretty inexpensive oscillator from an inverter, cap and resistor.
I've used a crystal "can" oscillator (XO) to drive several microcontrollers in the the past. I would recommend implementing a simple external oscillator using your crystal and an inverter from which to drive the PICs, rather than try and utilize the clock signal directly from the first PIC to drive the second PIC. Stray capacitance (...)
Crystal oscillator waveforms on driver side vary between almost pure sine and square wave. There's nothing about right or wrong, unless the datasheet specifies specific waveforms. Determining parameters are oscillator inverter gain, output and crystal series impedance. In terms of emc behaviour, low level, low distortion waveforms are (...)
Yes, but you will need an extra logic chip (typically an unbuffered inverter like the 74HCU04) to make the oscillator. A quartz crystal needs a little extra circuitry to make it function as an oscillator. See here:
I have used the Fast PWM mode for generating SPWM 16 kHz signal with microcontroller ATMEGA16 wth oscillator frequency 16Mhz (see Atmega16 50Hz sine wave.jpg). Program written in Bascom AVR. Our frequency is 50Hz ? time period is 20ms. A half cycle takes 10ms. Recall that the sine table used is only for half a cycle. So, the 32 values m
Also, make sure your synthesis tool is not eliminating those redundant inverters. Logically, 1 inverter is the same as 99 inverters and unless you force the tool to leave those inverters alone, it will optimize them away. But (IMO) don't use a ring oscillator, you're just asking for trouble. If you can (...)
PURE sine wave inverter is an ANALOGUE contraption :smile: consisting of 50Hz sine wave oscillator and amplifier stage, driving output power transformer. Everything else is just approximation.
The oscillator are the four amps, bottom lefthand side, each with a .1 MF cap from an input to ground. The output is taken upwards and to the right. So breaking this line and inserting your sine wave here will work. Or you can break the feed between any of the oscillator amps and feed you sine wave in to the input. There are circuits to produce a s
Here is a bare-bones schematic showing the concept behind an H-bridge The supply is 12V. The clocks represent the oscillator and an inverter, which deliver alternating pulses to the switching devices. Cur
To generate 100W AC power using sine wave oscillator and linear power amplifier you need 125W from DC supply. Efficiency of such converter is worse than 80% usually it is about 75%. Square wave inverter teheoretic efficiency is 100%. inverters with sine wave output are using PWM and filtering at the output. That's what FvM meant talking (...)
83520 hi... i have big problem... i have to design a sci based n-stage cmos ring oscillator. Each inverter may have the same size of W/L. target duty ratio of Vx = 50% +/- 1% ring Ring oscillator output frequency f = 1 GHz when Vctrl=0V. Trise/Tfall of Vx, Vy, Vz, & Vzb < 100ps so i have tried to design oscillator...
hi all, ring oscillator is a very simple design and i can implement properly in Spectre, however, when i move the whole thing to HSPICE, it doesnt work, i checked my NAND gate and inverter, they are all functional.
Hi i want to generate a 20kHz spwm for an inverter, so i need a 20Khz triangular and a 50Hz sin wave but i don't now how to generate these waveforms. anyone can help me please? thanks for your help Farzam Hi Farzam This is too easy ! for triangle wave , you can easily use a relaxation oscillator , which is based on CD40106
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.
PWM is pulse width modulation the process by which the ON time of the square pulse (clk) is reduced and made finer sine wave oscillator is the oscillatory tank circuit which produces the sine signal of op voltage
Hi. I am simulating a cmos ring oscillator at the schematic level. I want to simulate it with some "interconnect parasitic capacitance" at the output of each inverter. What do you think can be an approximate value of this capacitance that I need to put at the output of each inverter so that when I do the layout, there is not very much (...)
I tried phase noise simulation of my ring oscillator. It's a simplest single-ended inverter-based ring with 5 stages. I'm using TSMC65nm, l=60nm, w= 2~3um. total current is about .6mA I have attached the phase noise plot The yellow line is the -20dB/decade line. images.elektroda.
urs designed cct. seem to be good,apparently no mistake is found.what problems you are facing need to be explained.however if you send the oscillator cct.of 16f877 more guidance will be submitted.regads
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
normally PWM sine is trivial with quadrature analog oscillator, and comparator, and mux the PWM to enable each bridge leg. Since you had Sin values in table, you can generate cosine values too and H bridge ON state values as well from quadrature wave state table. Create your State
I am learning about oscillators right now. In this case, it would be a good idea to start evaluating known working oscillator circuits. The present one has a positive DC feedback and thus works as a latch. It can't oscillate. You can change it to a slightly more reasonable construct by adding a highpass to the LC feedback path. T
Hello, I saw ring oscillator frequency in a model file (31 stages). What is the use. Is it telling the max. operating frequency of the pdk. Thank You, Y. Li
Hi , i am supposed to do a full custom design a 1 Mhz cmos ring oscillator consisting of 5 stages of inverters with CL = 10pf. The delay of each stage comes out to be 0.1 usec.. i am using 180 nm umc cmos technology with 3 volts supply.How do I find the W/L values of each transistor? I know the W Of Pmos = 2 * W of Nmos .. Kindly show me a he