عنوان البحث(Papers / Research Title)
a novel design technique of one stage CMOS-OTA for high frequency applications
الناشر \ المحرر \ الكاتب (Author / Editor / Publisher)
حسن جاسم مطلك السرياوي
Citation Information
حسن,جاسم,مطلك,السرياوي ,a novel design technique of one stage CMOS-OTA for high frequency applications , Time 5/15/2011 8:07:39 AM : كلية الهندسة
وصف الابستركت (Abstract)
this paper presentsa novel design technique of one stage cmos ota using CMFCTO ENHANCE BANDWIDTHr
الوصف الكامل (Full Abstract)
Introduction: Current-mode circuits are used instead of voltage mode-circuits for a widevariety of applications. The reason is that in voltage-mode circuits parasiticcapacitances create dominant poles at relatively low frequencies, which limitsthe bandwidth. In general the node impedances in current-mode circuitsare low and the voltage swings are small. Thus the time constant effect isminimal. Hence the slew rate for current-mode circuits are sufficiently high[1]. They are well suited to operate at higher frequencies. Furthermore current- mode circuits are also suitable for integration with CMOS technology and thus become more and more attractive in electronic circuit design [1]. In the last decade, various new current-mode active building blocks have received considerable attention due to their larger dynamic range and wider bandwidth such as second generation current conveyors (CCIIs), operational transconductance amplifiers (OTAs) and current-feedback op-amps (CFOAs) [2]. Modern wireless and wire line communication systems require highperformance analog base-band circuits. The trends for modern communication systems are higher data rate, large bandwidth and high linearity which are required for analog front-end circuits and analog filters as well [3]. When it comes to high frequency applications coupled with electronic tunability, second generation current conveyors (CCIIs), operational transconductance amplifiers (OTAs), and current feedback op-amps (CFOA) have proven to be the best candidates for implementation continuous time filters [4]. Many techniques used to maximize bandwidth of second generation current conveyor have been published [5]-[9]. These papers shows the enhancement of bandwidth of CCII but with extra amount of power consumption and complex circuitry. In this paper, a new second generation current conveyor (CMOS CCII) based-on resistive compensation technique is presented. The resistive compensation technique work with very simple principle, since it adds zero frequency to transfer function of current mirror, this process will cancel the affect of parasitic capacitance of current mirror on bandwidth of second generation current conveyor. The primary advantages of resistive compensation technique are enhanced frequency response, improved slew rate, and settling time of the CMOS CCII without extra power dissipation. This new design technique of CMOS CCII exhibits wide bandwidth, high slew rate, and low power consumption. The simulation results have confirmed the theoretical predictions.
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