Abstract
A new circuit for realization of universal current-mode filter using current Follower Transconductance Amplifiers (CFTAs) is presented. The proposed circuit realizes current-mode low pass, high pass and band pass filter functions simultaneously with a single current source at the input. The band reject and all pass filters can also be obtained from the proposed circuit without any extra hardware. The proposed circuit employs three passive grounded elements and two CFTAs. Linear electronic control of natural frequency ω0 is available in the proposed circuit. The quality factor can be independently adjusted through grounded resistor. The proposed circuit employs two grounded capacitors and a grounded resistor along with two CFTAs. The grounded resistor can be replaced by an OTA based circuit for linear electronic control of quality factor Q0. The circuit exhibits low active and passive sensitivities for ω0 and Q0. Simulation results are obtained using PSPICE software which is in conformity with the theoretical findings.
Highlights
Current mode circuits are very popular due to some of their advantages over their voltage mode counter parts.How to cite this paper: Walde, N. and Ahmad, S.N. (2015) Realization of a New Current Mode Second-Order Biquad Using Two Current Follower Transconductance Amplifiers (CFTAs)
It consists of two CFTAs, one grounded resistor and two grounded capacitors
The characteristic equations of CFTA are v f = 0, iz = αi f, ix+ = gmvz, ix− = −gmvz where α = 1− i where i denotes the current tracking error of the current follower from the terminal f into the terminal-z ( i 1 ). from the non-ideal properties of CFTAs, the characteristic equation of the proposed circuit according to Figure 2 is
Summary
Current mode circuits are very popular due to some of their advantages over their voltage mode counter parts. (2015) Realization of a New Current Mode Second-Order Biquad Using Two Current Follower Transconductance Amplifiers (CFTAs). The proposed circuit realizes basic current mode filter functions such as low pass (LP), band pass (BP), and high pass (HP) for a single input current source. A new current-mode second-order CFTA biquad filter is presented which uses two active elements and three passive grounded elements. 2. Proposed circuit Realization of Current Follower Transconductance Amplifier (CFTA). It consists of two CFTAs, one grounded resistor and two grounded capacitors. A routine analysis of the proposed circuit as shown in Figure 2 yields the following current transfer functions. Equations (12) and (13) show that ω0 can be linearly and electronically varied through gm .Whereas quality factor Q0 can be linearly changed through grounded resistor R1 independent of ω0
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