“…Over the period, several current-mode active blocks evolved . Some of the most important active blocks in the literature are CCII [2], CCCII [3][4], DVCC [5][6], OFCC [7][8], CDTA [9], MOCCII [10][11], VDTA [12], ICCII [13], CFTA [15], VDCC [16], ZC-CFTA [17], DOCCII [18], MOCCA [19], MO-CCCA [20], CCCCTA [21], DDCC [22], EX-CCCII [23], DV-EXCCCII [24], LT1228 [25], FTFNTA [26], DXCCTA [27], FDCCII [14,28], and many more.…”