Ahmed H. Madian

On The Optimization of Fractional Order Low-Pass Filters

This paper presents three different optimization cases for normalized fractional order low-pass filters (LPFs) with numerical, circuit and experimental results. A multi-objective optimization technique is used for controlling some filter specifications, which are the transition bandwidth, the stop band frequency gain and the maximum allowable peak in the filter pass band. The extra degree of freedom provided by the fractional order parameter allows the full manipulation of the filter specifications to obtain the desired response required by any application. The proposed mathematical model is further applied to a case study of a practical second- generation current conveyor (CCII)-based fractional low-pass filter. Circuit simulations are performed for two different fractional order filters, with orders 1.6 and 3.6, with cutoff frequencies 200 and 500 Hz, respectively. Experimental results are also presented for LPF of 4.46 kHz cutoff frequency using a fabricated fractional capacitor of order 0.8, proving the validity of the proposed design approach.

Catastrophic short and open fault detection in MOS current mode circuits: A case study

In this paper, the issue of testing analog MOS current mode circuits for catastrophic open and short faults has been addressed. A case study based on the 6-transistor transconductor circuit is discussed. The five-fault model is assumed per transistor, namely a short circuit between any two terminals as well as an open-circuited drain or source. DC testing is performed in order to reduce test cost instead of AC testing which requires expensive equipments. Only one fault is assumed to exist in the circuit under test. PSpice simulations have been carried out using the 0.18µm MOS model provided from MOSIS. The circuit has been simulated for fault-free condition and after injecting a single fault at a time into the circuit. The simulation results have been analyzed and compared. It is found that the total fault coverage is 93%.

Fractional Order Oscillator Design Based on Two-Port Network

In this paper, a general analysis of the generation for all possible fractional order oscillators based on two-port network is presented. Three different two-port network classifications are used with three external single impedances, where two are fractional order capacitors and a resistor. Three possible impedance combinations for each classification are investigated, which give nine possible oscillators. The characteristic equation, oscillation frequency and condition for each presented topology are derived in terms of the transmission matrix elements and the fractional order parameters

Field programmable analog array based on CMOS CFOA and its application

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Analog fault diagnosis by inverse problem technique

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Three Fractional-Order-Capacitors-Based Oscillators with Controllable Phase and Frequency

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