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This paper presents a fault detection algorithm to detect parametric fault in linear and weakly non-linear analog circuits by Bhattacharyya measure, a statistical metric. Linear feedback shift register (LFSR) generated pseudo-random bit sequences are fed to digital-to-analog converter (DAC) to obtain random analog input stimuli for the circuit under test (CUT). Bhattacharyya coefficient is measured...
A statistical approach is proposed to detect parametric fault in linear and weakly non-linear analog circuits by mapping faults to a statistical metric, Bhattacharyya distance which is measured from the Probability Density Function (PDF) of the outputs. The non-Gaussian Auto-regressive (AR) model is used to estimate the PDF. To validate the proposed statistical approach, we have simulated two benchmark...
A new Oscillation Built-In-Self-Test (OBIST) methodology is developed to reduce test time and complexity in the testing of analog circuit. The technique is incorporated to test an op-amp based filter circuit. Circuit Under Test (CUT) is converted to a robust oscillator by introducing a nonlinear feedback path during test mode. The frequency of oscillation is processed by purely digital circuit which...
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.
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...
In this paper a design methodology for a novel robust adaptive integral backstepping controller for the motion control system, has been presented in a systematic manner. Backstepping is a realistic nonlinear control design algorithm based on Lyapunov design approach, as a consequence it automatically ensures the convergence of the regulated variable to zero. Adaptation schemes are designed to estimate...
This paper deals with design and test of Operational Transconductance Amplifier (OTA) based linear analog circuit. Four different types of filters, biquadratic, band pass, low pass, and all pass, operated at high frequencies are configured. The test and diagnosis scheme relies on the Nyquist Shape of transfer function of the analog circuit. Monte Carlo simulation has been carried out to perform the...
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