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This work considers the stabilization problem of a class of unstable first order linear systems with time delay. A methodology is proposed to tune a proportional-derivative (PD) controller. Necessary and sufficient conditions are stated in order to guarantee the stability of the delayed closed loop system. The main motivation for studying this problem arises when checking for systems with a considerable...
This paper presents the design and functional simulation of a new multi-level bang-bang phase detector for use in a clock and data recovery circuit (CDR). The designed phase detector provides information of the nature of the delay between its input signals in a digitised manner, establishing six levels of quantisation. To avoid the metastability that hinders the performance of traditional bang-bang...
Since multi-scroll chaotic oscillators are known to have many challenges due to the parasitic effects in the circuit implementation, this paper analyzes their effect on the non-ideal slopes and presence of delays in the realization of the saw-tooth nonlinear function which is used to generate these oscillators. The proposed analysis and description is applicable for any comparator-based nonlinear...
In this paper, a 3.125 GHz four stage voltage controlled ring oscillator is presented. The oscillator has been designed in a 0.18 µm CMOS process with a 1.8 V supply. Behavioural simulations predict an 18% tuning range for the oscillator, with a −91 dBc/Hz phase noise at a 1 MHz offset. Its power consumption has been simulated to be only 12.6 mW.
Experiments for the online closed-loop control of neural prosthetics require feedback within 100ms. In a typical neurophysiology laboratory with local computing machines, a majority of this time is spent on acquiring and analyzing the neural signals and a minority (i.e. less than a millisecond) is actual data transfer among machines on local- or campus-area networks. However, the local computing machines...
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