In this paper an analysis of the classical highorder Extremum Seeking Control (ESC) scheme is presented in comparison with an improved ESC variant proposed here. The proposed ESC scheme is based on a band-pass filter instead of the series combination of highpass and low-pass filters used in the classical ESC scheme. The relation between the search speed and the derivatives of the unknown input-...

Describing function is an equivalent gain of nonlinear element, defined by the harmonic linearization method of nonlinear static characteristic (Novogranov, 1986, Slotine and Li, 1991, Schwarz and Gran, 2001, Vukic et al. 2003 and many others). It is a known method of analysis and synthesis when nonlinear system can be decoupled into linear and nonlinear parts (Fig. 1). If the linear part of th...

There is a tremendous need for miniaturization as well as low power consumption in many processor architectures, especially when they are used in portable equipment. In this context, the design of low power DSP processors receives utmost importance. A clever means of achieving this is by use of pass logic circuits in these designs. But switching activity is found to be a major contributor in dy...

The traditional coplanar electromagnetic bandgap (EBG) structure is analyzed. The method is studied to lower the center frequency and broaden the bandwidth in this paper. A novel structure of U-bridged EBG power plane is proposed. The simulation and test results show that the bandwidth of the new structure is 4.32GHz, and the lower side cutoff frequency is at 380 MHz with the stopband depth at ...

While visually complex stimuli such as human faces contain information across a wide range of spatial frequencies, information related to specific perceptual judgements may be concentrated in distinct spatial frequency bands. For example, previous work on static face perception has shown that face recognition relies primarily on low spatial frequency information while other tasks, such as ident...

Two iterative analysis algorithms were developed for the reoptimization of the LP synthesis filter based on a pulse-by-pulse reoptimization manner. In this study, the use of the pitch filter in the analysis algorithms is introduced. Similar to the no pitch case, improvement in the gain is achieved. On the other hand, this gain has dropped compared to the no pitch case. Moreover, the number of p...