Title :
Ultra low-power analog Morlet wavelet filter in 0.18 μm BiCMOS technology
Author :
Haddad, Sandro A P ; Karel, Joel M H ; Peelers, R.L.M. ; Westra, Ronald L. ; Serdijn, Wouter A.
Author_Institution :
Delft Univ. of Technol., Netherlands
Abstract :
A novel procedure to implement the wavelet transform using analog circuitry is presented. First, an approximation is used to calculate the transfer function of the filter, whose impulse response is the required wavelet. Next, to meet low-power low-voltage requirements, we optimize the state-space description of the filter with respect to dynamic range, sensitivity and sparsity. The filter design that follows is based on an orthonormal ladder structure and employs log-domain integrators as main building blocks. Measurements demonstrate that it approximates the required wavelet base (i.e. Morlet) in an excellent way. The tenth-order log-domain filter operates from a 1.5-V supply voltage and a total bias current of 4.3μA.
Keywords :
BiCMOS analogue integrated circuits; analogue circuits; ladder filters; low-power electronics; state-space methods; transfer functions; transient response; wavelet transforms; 0.18 micron; 1.5 V; 4.3 muA; BiCMOS technology; analog Morlet wavelet filter; analog circuitry; filter transfer function; impulse response; log-domain integrators; orthonormal ladder structure; state-space description; tenth-order log-domain filter; ultra low-power filter; wavelet transform; Band pass filters; BiCMOS integrated circuits; Biomedical measurements; Differential equations; Discrete wavelet transforms; Dynamic range; Frequency response; Time factors; Transfer functions; Wavelet transforms;
Conference_Titel :
Solid-State Circuits Conference, 2005. ESSCIRC 2005. Proceedings of the 31st European
Print_ISBN :
0-7803-9205-1
DOI :
10.1109/ESSCIR.2005.1541625