Low-Voltage Current Feedback Operational Amplifiers

Abstract

A number of current feedback operational amplifier topologies suitable for operation in a low-voltage environment are introduced in this paper. Their realization is based on the corresponding low-voltage second generation current conveyor topologies. Important performance factors such as accuracy, bandwidth, and linearity have been considered, and the obtained simulation results have been compared in order to evaluate the behavior of the proposed topologies.

Low-Voltage Complex Filters Using Current Feedback Operational Amplifiers

“…The CFOA stage employed for realizing the required complex integrator blocks is given in Figure 7 [26]. Τo bias current was 0 = 10 A and the employed power supply voltage scheme was DD = 1.5 V and = 1 V. Considering MOS transistor models provided by AMS C35D4 CMOS process, the aspect ratio of nMOS transistors was 10 m/1 m, while the corresponding ratio for pMOS transistors was 74 m/1 m. The layout design of the filter in Figure 6 is demonstrated in Figure 8.…”

A novel Nth-order voltage-mode universal filter based on CMOS CFOA

“…The current feedback operational amplifier (CFOA) is one of the most important active building blocks in fully integrated continuous time circuits [1][2][3][4][5][6][7][8]. Compared with traditional voltage-mode operational amplifiers, it has many essential advantages such as wider and nearly constant bandwidth independent of closed-loop gain, higher slew rate, lower sensitivity, larger dynamic range, lower power consumption, and ease of realizing various functions with lesser number of passive components.…”

Comparative Study of Resistorless Filters Using Differential Voltage Current Controlled Current Feedback Operational Amplifiers and Differential Voltage Current Controlled Current Conveyors

“…A number of CFOA topologies with terminals of single type have been already introduced in the literature [3][4][5][6]. Enhanced CFOA topologies, including Fully Differential CFOAs (FDCFOAs) [7][8][9][10], Differential Voltage CFOAs (DVCFOAs) [11,12], have been also published.…”

“…Enhanced CFOA topologies, including Fully Differential CFOAs (FDCFOAs) [7][8][9][10], Differential Voltage CFOAs (DVCFOAs) [11,12], have been also published. Comparative studies of CFOAs and DVCFOAs have been performed in [4,13], respectively.…”