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17 Threads found on Relaxation Oscillator Circuit
Skip initial transient analysis is only useful and possibly needed for simulation of linear oscillators like LC or phaseshift. relaxation oscillators like NE555 don't have a stable operation point and always start oscillating without specific means.
Hello, I need a suitable comparator architecture in standard CMOS process for a relaxation oscillator. This oscillator has 2 comparators and 2 caps. Frequency = 20 Meg and VCC supply = 5V. Basically a high speed low propagation delay comparator circuit is needed to get good linearity. Can some suggest papers that might (...)
I believe this is just comparator chatter. You can add enough hysteresis to cover up the various node-bounces that are kicked by the first comparator switching event, of you can move to a two-comparators, SRFF control that "ratchets" and won't reswitch. I fear, adding hysteresis will stop the oscillator from intended operation.
This oscillator configuration is called a "relaxation oscillator". They're not known for their precision or stability, but they're cheap and convenient :) The exact oscillation frequency is a function of the logic thresholds of the gates IC1a, b and is thus hard to analytically define (and will probably be temperature dependant too). With (...)
For an analysis of this circuit relaxation oscillator - Wikipedia, the free encyclopedia
UJT relaxation oscillator can be used as a sawtooth generator. The transistor circuit linked by KerimF is actually comprised of an UJT simulation circuit and a current source. UJT seems like a kind of legacy these days, some are still available at distributors, e.g. Onsemi 2N6027G.
The circuit will oscillate with the voltage on C2 oscillating between (V1+Vdd)/3 and V1/3 assuming the opamp has a rail to rail output. To calculate the time period you need to calculate the C2 capacitor charging time from V1/3 to (V1+Vdd)/3 through the RC network supplied by Vdd and the C2 discharge time from (V1+Vdd)/3 to V1/3 through the RC netw
Hi. Y'all The attached file is one of relaxation oscillators I am using. This circuit specifically uses a TI?s TLC3702 comparator to generate a square wave output. Can you perform a pss (periodic steady state) and phase noise analysis for this relaxation oscillator in Multisim? My first software, (...)
Hi everybody tell me how the frequency of the circuit shown below depends on the tank circuit and where from the tank circuit gets excited? ---------- Post added at 23:17 ---------- Previous post was at 23:14
This is the Eti 549 metal detector circuit I'm referring to. I'd really appreciate it if someone could guide me and tell me what's exactly happening in the transmitter section. The first stage is a relaxation oscillator producing 800 Hz which is being fed into the next stage, which is a Colpitt's oscillator, which modulates (...)
you can google the topic "relaxation oscillator"
if your system has a clock, and your OFF state does not have to be a continuous number, you could use a programmable counter for the OFF state. If not, you can use a relaxation oscillator where you control the time constant for the OFF state.
Hi ... I am designing a cmos relaxation oscillator connected to a crystal . My circuit look like this I connect the crystal working with resonance freq at 50MHz between the two outputs. The issue is, there are no oscillations p
I'm prototyping a sine wave generator using AD8620(dual, low noise, high bandwidth(+/-) ) op amp. The 'A' side is a relaxation oscillator and 'B' side is a Sallen-Keys LPF. Well, the first .jpg attachment herein is initial circuit(using 10uF caps. where the supply connects to breadboard(+ and - ), the top image is output of first stage (...)
Need to design a simple relaxation oscillator. Want it to be small and simple. Frequency can be anywhere between 10-30MHz. What is the simplest bias circuit that can provide the OP for the osc, when PVT changes. (temperature 0-85, vdd 3.0-3.6). Will a resistor plus a diode-connected nmos do? Thanks.
For such low frequency operation, I usually use the RC relaxation type oscillator. It can provide good phase noise and low power consumption. By the way, you may add a hysteresis circuit to prevent the glitch issue in such low frequency operation.
Hi, A R-C relaxation oscillator is the solution. To get variation across process less than 10%, u have to go for trimming. U can either trim current or capacitor. Current trimming is the simplest. Regards, cinch What size of capacitor in that circuit do you usually use? 1PF ? 10PF? or else?