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This paper proposes an approach to realize a leapfrog filter with transmission zeros by using OTA-C integrators and resistor-based addition circuit instead of OTAs. This method has advantages of reduced number of active elements and spread of element values. A tenth-order bandpass filter is presented as a design example.
In this work an analytical design method for two types of 2D recursive filters is proposed. The design starts from a given analog prototype filter with specified parameters and a transfer function which is factorized into elementary (biquad) functions. Applying adequate frequency transformations to these functions, the desired 2D filters are directly obtained in a factorized form, preserving the selectivity...
One of the problems with on-chip active-RC filters is that in order to satisfy tight specifications accurately, they need to be fine-tuned. This becomes more difficult with increasing filter order. In this paper, we introduce a simplified tuning method which is obtained by a new structure consisting of a filter section of second- or third-order (Biquad or Bitriplet which is referred to as a ‘tuning...
This paper presents a design procedure for high-order continuous time low-pass filters based on the cascade of biquadratic cells. The proposed approach is amenable for integration, as it takes into account the maximum capacitance spread imposed by the available technology, and also allows a tradeoff between noise and maximum linear range to be met, thereby improving the dynamic range. Simulations...
An OTA-C filter implementation suited to low-voltage operation is presented. An operational transconductance amplifier (OTA) based on a bulk-driven input stage with enhanced DC gain and bandwidth was designed and included in a 1.2-V tunable fully differential second-order OTA-C lowpass filter. Experimental results, obtained in standard 0.35-µm CMOS technology, showed a dynamic range around 70 dB with...
The paper discusses the possibility of using the dynamics of a class of Cellular Neural Networks (CNN's) for electrocardiogram (ECG) signals classification. The main idea is that of segmentation and transformation of the temporal signal into a 1D spatial one which is further processed by means of a bank of linear spatial filters using a parallel architecture of CNN type. A major advantage of the proposed...
Current methods used to design multiplierless digital filter have demonstrated their potential to construct low complexity circuits from multiplier blocks with few adders in order to replace the multipliers of standard Finite Impulse Response structures. However, the traditional approach only provides a local optimization as it need to rely to defined circuit architectures, such as the direct form...
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