A Transformation Method from Voltage-Mode OP-Amp-RC Circuits to Current-Mode Gm-C Circuits

Abstract

A new transformation method is presented and used to transform voltage-mode op-amp-RC circuits to current-mode Gm-C ones. The proposed method enables the generation of high-performance Gm-C filters that benefit from the advantages of good and well-known op-amp-RC structures and the advantages of the current-mode circuits, and at the same time feature electronic tunability, high frequency capability, and monolithic integration ability. An attractive feature of the proposed method is that it results in Gm-C structures with only grounded capacitors in spite of the presence of floating capacitors in the original op-amp-RC circuits and it utilizes a small number of transconductors. Moreover, simultaneous multiple outputs are easily available in the transformed currentmode Gm-C circuits.

FPAA-based implementation of fractional-order chaotic oscillators using first-order active filter blocks

“…In this manner, this paper is inspired on using first-order active filter transfer functions to implement FOCOs on an FPAA, and therefore, the resulting design can be implemented in CMOS technology as it has already shown in [17] , for the implementation of the fractional-order FitzHugh-Nagumo neuron model. In addition, the design of FOCOs using first-order active filters, can be transformed to circuits based on operational transconductance amplifiers [18] , well-known as Gm-C filters [19] , that benefit from the advantages of good amplifier-RC structures and allow monolithic integration using CMOS technology [20] .…”

Current conveyors-based circuits using novel transformation method

“…Primarily these are CFA (Current Feedback Amplifier) [3], OTA (Operational Transconductance Amplifier) [1,4], BOTA (Balanced Output Transconductance Amplifier) [5,14], CC (Current Conveyors) [3,7,8], COA (Current Operational Amplifier) [13] or pure-current element CMI (Current Mirror and Inverter) [12]. Numerous scientific papers and publications dealing with filters using these active elements have been presented [6,9,10]. In this paper we are concerned with the application of transconductance amplifiers BOTA, because in integrated structures these circuits have excellent frequency properties.…”

Realization of Tunable Pole-Q Current-Mode OTA-C Universal Filter

“…In current-mode circuits, summing of the current signals requires only a circuit node. As a result, current signals can be easily replicated and scaled using current mirrors, and they have the potential to operate at higher signal bandwidths [1]. Previous works that utilize the current-mode technique include those using current followers (CFs) [2], second generation current conveyors (CCIIs) [3][4][5], and operational transconductance amplifiers (OTAs) [6][7][8][9][10][11].…”