Analogue Implementation of Wavelet Transform Using Discrete Time Switched-Current Filters

Design and implementation of Wavelet Transform using Adaptive Genetic Algorithms and Analog filters

“…Among, the parameters 2  , 6  , 10  and 14  must be strictly negative for reasons of stability. The error integral is defined as…”

“…Among, the implementations using analogue sampled-data circuits have attracted much attention [2,[8][9][10][11]. A key feature of using these circuits for implementing WT is that dilation constant across different scales may be easily and precisely controlled by the clock frequencies.…”

“…However, because of the existence of local optima in this approximation, the performance greatly depends on the selection of the approximation starting point. Furthermore, in the WT circuit, as compared to SI integrators [8][9][10][11], litter attention has been paid to applying SI differentiators in analog WT systems. However, SI differentiators have many advantages such as good noise rejection and stability.…”

“…However, the SC circuits are not fully compatible with current trends in digital CMOS process and their performance suffers as supply voltages are scaled down. To resolve these problems, the SI circuit [8][9][10][11] is applied to implement WT. The SI WT circuits consist of analog filters whose impulse response is the approximated wavelet and its dilations.…”

“…However, for low-power, low-voltage and real-time applications, it is not suitable to implement the WT due to the high power consumption and large area associated with the required A/D (analog-digital) converter. Consequently, the analog WT implementations have been an attractive field in signal processing.Recently, some significant advances for implementing WT with analog filters have been introduced in the literatures [2][3][4][5][6][7][8][9][10][11]. Among, the implementations using analogue sampled-data circuits have attracted much attention [2,[8][9][10][11].…”