Analog circuit design using current mode active elements

Design of high frequency and low voltage circuits is one of the most important issues in many analog signal processing systems. The classical operational amplifier suffers from limited gain-bandwidth product and low slew rate, and hence fails to respond to these necessities. In order to correspond to the demands for high frequency and low voltage operation in analog circuits, designers have made plenty of attempts. Among these is the current mode approach. In the past years, current mode active elements have begun to receive a great interest as new alternatives. Current mode circuits have been receiving considerable attention due to their potential advantages such as inherently wide bandwidth, higher slew rate, wider dynamic range, simpler circuitry, low voltage operation and low power consumption. In this thesis, analog circuit design using current mode active elements is investigated. New applications of inverting second generation current conveyor (ICCII), and inverting current feedback operational amplifier (ICFOA), both of which can be considered as current mode active elements, are presented. First order all-pass filter, second order filter and oscillator circuits using these elements are given. CMOS realizations for the newly introduced ICFOA and its application are included. The workability of the circuits is verified using PSPICE simulations.