Abstract
This paper proposes an alternative way to implement the CMOS voltage differencing transconductance amplifier (VDTA) with linearly tunable. It has been designed by using the floating current source (FCS) and the current squaring circuit. The circuit achieves its linear tunability by squaring the long-tail biasing current of the FCS. In this way, the transconductance gains of the proposed CMOS VDTA can be varied linearly through adjusting the DC bias currents. As an application example, the proposed VDTA is used in the design of an actively tunable voltage-mode multifunction filter. The derived filter possesses the following desirable properties: simultaneous realization of three standard filter functions; employment of only two grounded capacitors; and electronic tunability of w o and Q . The performance of the proposed circuit and its filter design application were examined by PSPICE simulations with TSMC 0.25- m m CMOS real process technology.
Highlights
A brief review of the recently reported active elements and an introduction to several new controllable elements are given in [1]
The motivation of this paper is to develop the CMOS voltage differencing transconductance amplifier (VDTA) with linearly tunable transconductance
The circuit realization is based on floating current sources (FCSs) for implementing the transconductance stages
Summary
A brief review of the recently reported active elements and an introduction to several new controllable elements are given in [1]. The VDTA element is very useful in active circuit synthesis and quite suitable for electronically controllable analog circuits Another advantageous feature of this element is that it can be used for transconductance-mode solutions due to its input signals being voltages while the output signals are current [2]. The well-known configuration of multiple-output second-generation current conveyor (MO-CCII) has been supplemented to obtain the required number of current outputs of the first transconductance section Their major disadvantage though is the well-known fact that their performance (namely the gain gm) is directly proportional to the square root function of the external DC biasing current. To illustrate the application of the proposed VDTA, the design of active voltage-mode multifunction filter with single input and triple outputs is considered It realizes simultaneously the three standard biquadratic filters namely lowpass (LP), bandpass (BP) and highpass (HP) from each output of the circuit. PSPICE simulations with TSMC 0.25-mm CMOS process parameters are reported, which demonstrate the linearity and effectiveness of the proposed VDTA and its application
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