A FG-MOS Based Fully Differential Current Controlled Conveyor and Its Applications
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A FG-MOS Based Fully Differential Current Controlled Conveyor and Its Applications Rezvan Fani · Ebrahim Farshidi
Received: 13 June 2012 / Revised: 16 October 2012 © Springer Science+Business Media New York 2012
Abstract This paper presents a new fully differential second generation current controlled conveyor (FDCCCII) based on differential pair topology, which employs floating gate MOS transistors (FG-MOS). It uses floating gate MOSFETs at the input stage and has rail-to-rail structure which performs with both positive and negative signals. This circuit has tunable parasitic resistance at its input port. It operates with low supply voltage (±0.8 V), low power consumption (lower than 3 mW at current bias of 1 mA), and wide range parasitic resistance (RX ). This circuit has less MOSFET than the previous similar circuits and is suitable for integrated circuit design. To demonstrate the application of the proposed circuit, a fully differential current mode LC-ladder filter and a fully differential multifunction biquad filter are designed. Simulation results by HSPICE confirm validity of the proposed circuit and its application. Keywords Current-mode · Current conveyor · Floating gate MOS · Fully differential · LC-ladder · Active filter 1 Introduction Nowadays, the circuits based on current-mode (CM) structures are very important [6, 19], because they provide some desirable characteristics such as low power consumption, low supply voltage with wide dynamic range, large bandwidth, and nonconstant gain bandwidth which are difficult to reach in voltage mode structures [19]. The second generation current conveyor (CCII) is the most important block in current mode which has good operation in both current and voltage modes. This is a R. Fani () · E. Farshidi Electrical Department, Faculty of Engineering, ShahidChamran University, Ahwaz, Iran e-mail: [email protected] E. Farshidi e-mail: [email protected]
Circuits Syst Signal Process
practical block which has a wide range of applications [11]. Many changes are applied to raise the ability of the block, such as current controlled conveyors (CCCII) which are characterized by their controllability of parasitic resistance (RX ) at the input stage, differential difference current conveyors (DDCC) [5], differential voltage current conveyors (DVCC) [14, 16], and fully differential current conveyors (FDCC) [6, 18, 19, 27]. Tunable parasitic resistance is an important characteristic that makes CCCII one of the most popular current mode circuits. Current controlled conveyor is made of two main parts: voltage follower and current copier. There are two methods to design voltage followers for CCCII: using translinear structure or using differential pair input stage. The first current conveyors were based on translinear structure [9, 23, 24]. This type of CCCII is simple but suffers from large offset voltage and poor voltage-following performance [4]. Recently CCCII based on differential pair input stage was introduced [2–4]. This type of CCCII is designed by less MOSFETs and has
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