In modern electronics, the clock signal is most frequently produced by quartz generators and sometimes by RC-based circuits or other approaches. Here we demonstrate a new miniaturized clock signal generator based on a memristive (memory resistive) device17 operating in a Sisyphus-like cycle. The cycle was completed by relaxation to the ground state in the presence of an additional periodic signal. Depending on its detuning, the qubit was driven by the resonator either “uphill” (the usual Sisyphus process) or downhill (unusual, or “happy Sisyphus” process). In these circuits, a driven artificial atom, a qubit, was coupled to either a mechanical or an electrical resonator. Recently, Sisyphus processes9 were studied in electric circuits based on superconducting10,11,12,13 and normal-state14,15,16 systems. According to Greek mythology, King Sisyphus was doomed to repeatedly push a rock uphill, which would then roll back down. 7.Īnalogous phenomena in driven dissipative systems are known as Sisyphus processes. (b) is reprinted with permission from ref. Memristance oscillations and clock pulses are shown schematically on the graphs (e). (d) Simplified effective circuits realizing a two-phase memristive Sisyphus circuit: the increasing memristance stage 1 (left circuit) and decreasing memristance stage 2 (right circuit). (a–c) Examples of Sisyphus cycles: (a) leaky faucet, (b) dripping ants7,8, (c) mythological Sisyphus. For example, some types of ants7,8 can continuously climb a rod, aggregate, and eventually drop, right after a critical mass is accumulated. Similar dynamics can be even found in wildlife. Other examples of relaxational dynamics can also be found in granular media4 as well as in mechanical5 and superconducting systems6. One example of these is the leaky faucet, where the suspended fluid mass increases gradually, until it suddenly decreases, when the droplet tears of f1,2,3. In addition, the suggested approach can be used for mimicking some cyclic (Sisyphus) processes in nature, such as “dripping ants” or drops from leaky faucets.Ĭyclic evolutions and relaxation oscillators are ubiquitous in nature. Importantly, nanoscale realizations of memristive devices offer small-size alternatives to conventional quartz-based oscillators. We demonstrate the circuit operation both experimentally, using a memristor emulator, and theoretically, using a model memristive device with threshold. In our circuit, the oscillator frequency and duty cycle are defined by the switching characteristics of the memristive device and external resistors. Here, we report the design and experimental realization of a memristive frequency generator employing a unique combination of only digital logic gates, a single-supply voltage and a realistic thresholdtype memristive device. Frequency generators are widely used in electronics.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |