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This paper presents a graph based synthesis procedure for reconfigurable linear analog function. A n-level weighted binary tree structure has been used to represent nth order linear network. Root of the binary tree has two children nodes with weights of first order lowpass filter (LPF) and first order highpass filter (HPF). Traversing through each possible path in the tree implements one filter type...
A systematic synthesis approach for designing a voltage-mode multifunction operational transconductance amplifier (OTA)-C biquadratic has been described using programmable first order filter. The proposed filter shows lower sensitivities, high frequency response, lower output noise. The proposed second order filter has been converted to third order butterworth and elliptic filter employing a single...
This paper presents a character recognition system of handwritten Odia script. Although, a lot of research has been carried out in handwritten character recognition, not considerable research has been carried out to recognize handwritten Odia characters. In this work we have attempted to classify 36 basic Odia consonants. Total 48 geometric features were extracted which includes shadow features, centroid...
A novel, multifunction, universal high frequency biquadratic filter using dual output OTA is presented. By programming the input nodes of the proposed structure, different types of second order filters are realized. The proposed biquadratic has been transformed to a multifunction third order filter by cascading a first order filter with it. The third order structure implements different butterworth...
Presently, face detection has become an important aspect in biometric identification systems. Among many other facial features like position of nose, lips, eye, face contour acts as an important classifier in face detection. It requires huge memory space to store reference images of face in face recognition. Thus memory space can be optimized if the contour of a face is stored instead of complete...
This paper presents a novel programmable biquadratic filter structure using a network of operational transconductance amplifier(OTA). A new hierarchical design methodology of programmable higher order analog filter using the proposed biquadratic function as the basic building block has been discussed. The proposed biquadratic structure offers multifunction property, better programmability, low sensitivity...
Now-a-day fingerprint matching is considered as a subset of biometrics. It plays an important role in offices and industries to register the attendance of the employees, and in forensic departments for criminal identification. Although minutia based detection has gained more popularity, but it shows poor performance in case of low quality images. Whereas correlation based methods provides better results...
A new OTA based structure of M-ary modulator & demodulator have been proposed in this paper. Unlike conventional system, A/D D/A converters are not used in the proposed circuit. M-ary ASK modulator and demodulator are synthesized in a systematic and hierarchical manner. As a result, modulation and demodulation with different symbol size, M=2n where n=1 2, 3, 4 can be performed in this proposed...
In this paper, design methodology of programmable biquad OTA-C filter is presented. Biquadratic structure is realized with OTA, resistor and capacitor. The circuit realizes all types filter i.e. low-pass, high-pass, band-pass, band-reject and all-pass only by configuring the input combinations. All the filter responses are validated with SPICE simulation.
In this paper, authors propose an adept design methodology of pseudo-logarithmic function as a network of operational transconductance amplifier(OTA), a current mode device. It demonstrates an inherent tunable and programmable property of OTA to improve the performance of the logarithmic function. The performance of the circuits have been verified with SPICE simulation. Those results show the improved...
CMOS Operational transconductance amplifier (OTA) based second order linear and log domain filter synthesis from state space representation are reported. The proposed structure shows that from a single circuit three basic filtering functions can be obtained from three different nodal outputs in suitable condition. Center frequency, 3dB bandwidth and quality factor can be adjusted by tuning the transconductance...
This paper is concerned with state space representation of Externally Linear Internally Non Linear (ELIN) filter realized with CMOS Operational Transconductance Amplifier (OTA). OTA realisation of hyperbolic functions, sinh (x), cosh (x), tanh (x) using exponential functions (ex and e−x) are proposed. First order ELIN filters are realised in state space approach. SPICE simulation of the synthesized...
This paper presents a new design methodology of nth order polynomial function using Operational transconductance Amplifier(OTA), an excellent voltage-controlled current source. nth order polynomial function has been decomposed with first order function and realized as a network of OTA. Implementation of pseudo exponential function and oscillator are reported as application of the polynomial function...
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