Transconductance Based New Active Element Design and its Applications
Active elements are widely used in analog signal processing, such as filters, oscillators and inductance simulators etc. Furthermore, new designs are provided for researchers with these new proposed active elements. The voltage differencing transconductance amplifier (VDTA) is a recently introduced active element for analog signal processing.
In this thesis, two different new and simple CMOS realizations of VDTA are proposed. Each of these VDTA structures has some sufficient advantages compared to each other.
The VDTA element has two voltage inputs and two kinds of current output, so it is functional for voltage- and transconductance-mode operation. Furthermore, VDTA exhibits two different values of transconductance so that there is no need to external resistors for VDTA based applications which seem to be a good advantage for analog circuit designer.
Besides, some application circuits using VDTAs have also been proposed in this thesis. Positive and negative floating inductance simulators are presented. Proposed inductance simulators employing minimum number of active and passive components use no external resistors. Voltage- transconductance- and current-mode filters are proposed. Some filters have both single input-three outputs and multi inputs-single output.
Sensitivity analyses, effects of frequency limitation of transconductance gain and stability analyses of the proposed circuits are investigated and demonstrating the performance of the proposed circuits is tested with SPICE program.
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