This paper presents operational floating current conveyor (OFCC) based single input four output current mode filter. It employs only three OFCCs and two grounded capacitors and resistors each. The MOS based grounded resistors implementation is used, which adds feature of electronic tunability to the filter parameters. The filter also enjoys low component spread and low sensitivity performance. The effect of finite transimpedance and parasites of OFCC on the proposed circuit is also analyzed. The functionality of the proposed circuit is demonstrated through SPICE simulations using 0.5？μm CMOS process model provided by MOSIS (AGILENT). 1. Introduction The development of current mode continuous time filters has received growing interest due to its applications in sampled data systems, communications, and control systems [1, 2]. This is also in consonance with the trend of operating circuits at lower supply voltages where the current mode concept is more useful. The circuit operation in current mode circuits is decided by current which enables the system design to have wider dynamic range [3]. These circuits are also simple and compact as current addition/subtraction does not require additional circuit elements. Owing to the advantages of current mode filters, considerable research has directed towards the realization of single-input multiple output filters. A variety of current mode building blocks [4–10], namely, current follower transconductance amplifier [4], current conveyor [5–7], operational transconductance amplifier [8], copy current follower transconductance amplifier [9], and -Copy Current Inverter Transconductance amplifier [10], have been used to implement these filters [1, 4–22]. The structures—use excessive number of elements [6, 7, 13, 15] some of the references cited in [17], do not present low input impedance [1, 8, 13–16, 19] which is necessary for a current mode filter, employ multiple inputs to provide output responses [15, 16], put matching constraint [7, 10, 15, 16] to obtain all five responses of universal filter, has less than three simultaneous output responses [4, 8, 15, 16, 21], employ different type of active blocks [12, 19, 20]. The operational floating current conveyor (OFCC) [23, 24], which was introduced as operational floating conveyor (OFC) [25], combines the features of current conveyor and the current feedback op-amp along with additional current outputs that add flexibility in the circuit design. Literature survey on OFCC based circuits [26–32] shows that voltage mode filter [26–28], variable gain amplifier [29],
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