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Continuous wavelet transform analog circuit

Author: HuangZuoYing
Tutor: HeZuoGangï¼›XieShengShu
School: Hunan University
Course: Theory and New
Keywords: Continuous wavelet transform Transconductance - capacitor bandpass filter Current-mode circuit Frequency domain method
CLC: TN710
Type: Master's thesis
Year: 2002
Downloads: 163
Quote: 1
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Abstract


Since wavelet theory system was established in the mid-eighties, a wide range of applications and development in the field of signal processing. Wavelet transform requires a lot of computation, usually done by a computer, it is difficult to real-time processing. The continuous wavelet transform (CWT) is a powerful tool for analysis of non-stationary signals, the algorithm outperforms discrete wavelet transform data compression. Papers around the continuous wavelet transform analog circuit this hot issue, discussed the continuous wavelet transform time domain and frequency domain method; detailed analysis of the advantages and disadvantages of parallel structure with the serial structure; transconductance frequency domain method. - capacitor bandpass filter design; given to improve the linearity of the transconductance input stage transmission characteristics and expansion of a specific method of the linear range; self-correcting design of the chip (tuner) link to the filter parameters are automatically adjusted to the design standard value; Finally, a 16-channel filter bank wavelet transform method. This article's introduction: analysis of the significance of the wavelet transform analog circuits to achieve the continuous wavelet advantage, given the need to study and solve problems. The second chapter discusses the definition and classification of the wavelet transform, recalling the idea of ??the wavelet transform, the main features of wavelet transform and several basic wavelet. Chapter III study software implementation and continuous wavelet transform circuit (VLSI) structure, Merlin quickly formula, discrete wavelet transform analysis compared the continuous wavelet transform with respect to analog or mixed analog-digital circuits with digital circuit has obvious advantages, but also analyzes and compares the time domain method, given the similarities and differences of the frequency domain method used to implement the programs and research contents of wavelet transform and export wavelet transform bandpass filter formula, designed based on wavelet transform a band pass filter. Chapter 4 discusses the basic concepts and the performance characteristics of current-mode circuit transconductance, key research and improve the degree of linearity of the input stage of the transmission characteristics of and expand the linear range of the four methods to introduce more successful in this regard some circuit design, summarizes the similarities and differences of these four methods. Chapter V discusses the transconductance capacitance continuous-time filter performance characteristics, designed an adjustable center frequency the second band-pass filter, in order to make the filter parameters are automatically adjusted to the value of design standards, so as to maintain its design value realization precision, the paper gives a link (tunable) chip self-calibration. The papers also discuss the impact of non-ideal operational transconductance amplifier performance characteristics of the current-mode filter, for the actual circuit to complete the computer simulation of the MOS transistor level. Chapter 6 describes the serial and parallel filter bank structure, given the 16-channel filter bank paper design, and given papers with corresponding Matlab and Pspice for simulation results. Conclusion Conclusion and outlook of the paper.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Electronic circuit
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