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A single inverter does not provide enough phase difference for the ring oscillator to oscillate (Nyquist criterion of stability)
Given a sufficiently long connection between the output and input, a single gate structure will oscillate. For a TTL logic gate the rise time is only a few nanoseconds so it will take a couple feet of wire to create enough phase difference between in and out. —The preceding unsigned comment was added by 192.128.134.68 (talk) 21:03, 19 January 2007 (UTC).
Why would anyone go through the trouble of fabricating one? — Omegatron 01:51, 28 April 2007 (UTC)
They're commonly used in PLLs, which are an important part of many current high-speed chips. 153.96.171.70 (talk) 18:38, 16 January 2008 (UTC)
Possible error in the following sentence? : "A circular chain composed of an even number of inverters cannot be used as a ring oscillator; the last output in this case is the same as the input. However, this configuration of inverter feedback can be used as a storage element; it is the basic building block of static random access memory, or SRAM."
static random access memory, or SRAM should, maybe, be replaced by 'dynamic random-access memory or DRAM. — Preceding unsigned comment added by 137.138.196.171 (talk) 10:31, 29 November 2011 (UTC)
Are there any drawbacks with using these? Are they used to generate clocks signals? Doesn't a ring oscillator consume a lot of power because of constantly switching the inverters? 79.136.62.165 (talk) 09:58, 10 February 2012 (UTC)
Ring oscillators have some characteristics that make them less suitable than other electronic oscillators in some applications. In particular, a crystal oscillator is a better frequency reference -- the crystal has far less sensitivity to temperature and voltage than a ring oscillator.
A ring oscillator is sometimes used to generate clock signals, although far less often than the Pierce oscillator.
Some ring oscillators use amazingly little power. A ring oscillator typically consumes *less* power than a Pierce oscillator or other square-wave oscillator at the same frequency. Any kind of electronic square-wave oscillator, in turn, typically consumes *less* power than any other kind of oscillator. For example, the Vratislav reference in this article describes several ring oscillators. Many people think the amount of power required to turn on one green LED ( 40 mW ) is pretty small. The *worst* power consumption of the ring oscillators described by Vratislav (0.65 mW) use better than an order of magnitude *less* power than the LED. Other ring oscillators described by Vratislav (0.003 mW) use better than three orders of magnitude less power than the LED.
How could we improve the article to make this clearer? --DavidCary (talk) 20:47, 28 July 2013 (UTC)
1. "Period of ring oscillator vibrates in a random manner T=T+T' where T' is a random value."
This looks like a C++ statement. The expression needs to be revised and it doesn't work here. Possibly, t should be used because T is used for period.
2. "When the local silicon is cold ..."
This sentence seems to imply that a device is made of silicon. If that is the case, it should be clearly stated.
3. Has anybody been able to simulate one of the two provided schematics and obtained oscillation?
ICE77 (talk) 00:11, 1 August 2015 (UTC)
( Lminati (talk) 15:23, 12 March 2019 (UTC) )