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

Abstract

Differential Voltage Current Controlled Current Feedback Operational Amplifier is an attractive active element for realizing resistorless filters with a minimum active component count. This is verified through a design example, where a 3rd-order leapfrog filter has been realized using the AMS 0.35 m CMOS process design kit. The performance of the Differential Voltage Current Controlled Current Feedback Operational Amplifier filter is evaluated and compared with that obtained by the corresponding filter, where Differential Voltage Current Controlled Current Conveyors have been employed.

Electronically Tunable Lc High Pass Ladder Filter Using Otra

“…Literature survey of L-C ladder filters with different orders and approximation functions using leapfrog method [9]- [29] has been carried out. These configurations use variants of second generation current conveyors (CCII) namely dual/multiple output current controlled CCII (DOCCCII/ MOCCCII) [11]- [12], multiple output CCII (MOCCII) [10], differential voltage CC (DVCC) [14], differential voltage current controlled Current Feedback Operational amplifier (DVCCCFOA) [15] and differential voltage current controlled CCII (DVCCC), current feedback amplifier (CFA) [17], current feedback operational amplifier (CFOA) [16], current differencing buffer amplifier [18]- [20], current controlled current differencing buffer amplifier (CCCDBA) [21], operational trans-conductance amplifier [24]-26], current backward trans-conductance amplifier [27], current differencing trans-conductance amplifier (CDTA) [22]- [23], CMOS based differential integrators [9], CMOS based lossy and lossless integrators [28]- [29].…”

“…From the available pool of literature, it can be summarized that, Configurations [15], [16], [21], [24]- [26] and [9]- [14], [17]- [20], [22], [23], [27]- [29] provide voltage and current outputs respectively. There is no appropriate impedance level for the configurations [13]- [15], [17]- [20], [24]- [26]. Thus an additional active block may be required to access the output.…”

“…Thus an additional active block may be required to access the output. There is a limited literature is available on structures providing voltage output [15]- [17], [21], [24]- [26]. Furthermore, these structures do not provide output at low impedance except for those presented in [16], [21].…”