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    Shadow filters based on DDCC
    (2017-11-01)
    Khateb, Fabian
    ;
    Jaikla, Winai
    ;
    Kulej, Tomasz
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    Kumngern, Montree
    ;
    Kubánek, David
    This study presents a new realisation of voltage-mode shadow filters based on low-voltage low-power differential difference current conveyor (DDCC). Thanks to the attractive features of the DDCC, including its capability of performing arithmetic operations, the proposed filters offer the advantage of circuit simplicity, minimum number of active and passive elements, and no need for additional summing circuit, compared to the previous available shadow filter designs. The DDCC was designed and fabricated in Cadence platform using 0.35 μm CMOS AMIS process with supply voltage and power consumption of 1 V and 37 μW, respectively. The presented simulation and experimental results using a real chip validate the functionality of the proposed filters.
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    Electronically tunable voltage-mode quadrature oscillator based on high performance CCCDBA
    (2013-03-01)
    Khateb, Fabian
    ;
    Jaikla, Winai
    ;
    Kubánek, David
    ;
    Khatib, Nabhan
    This paper presents a new electronically tunable voltage-mode quadrature oscillator using two high performance current controlled current differencing buffered amplifiers (CCCDBA), two capacitors and single resistor, all of them are grounded which is advantageous for monolithic integration. The condition of oscillation and the frequency of oscillation are independent and can be controlled by two separate bias currents. The output voltages are obtained at the terminals with aμmost zero internal impedances, thus there is no need to use any buffering devices. The MOS structure of the CCCDBA presented in this paper is of a high performance and ensures precision, large dynamic range, wide bandwidth and has the capability to drive a load with very low resistance. Non-ideal analysis of the proposed oscillator is provided and PSpice simulation results using the 0.18 μm n-well CMOS technology from TSMC are included to verify the correct functionality of the proposed circuit. © Springer Science+Business Media, LLC 2012.