[Ref.] Year	Configuration	No. of active building block used	No. of passive component	Grounded passive component	Component constraints	Availability of LP, HP, BP, notch and AP response	Is the gain of input signa such as 2I_in And 3I_in required to get filter responses	Independent control of		Electronic tunability
[Ref.] Year	Configuration	No. of active building block used	No. of passive component	Grounded passive component	Component constraints	Availability of LP, HP, BP, notch and AP response		f₀ and BW	f₀ and Q₀	Electronic tunability
[13] 2007	3 input	2 CDTA	2	Yes	No	Yes	Yes	Yes	No	Yes
[14] 2010	3 input	4 OTA	2	Yes	LP, HP, BP & Notch = No, AP = Yes	Yes	Yes	Yes	No	Yes
[15] 2011	5 input	3 CCII	5	No	No	Yes	No	Yes	No	No
[16] 2011	5 input	3 ICCII	4	No	No	Yes	No	Yes	No	No
[17] 2011	4 input	1 FDCCII	5	Yes	LP, BP = No, HP, Notch & AP = Yes	Yes	No	Yes	No	No
[18] 2011	4 input	2 MO-CCCII	2	Yes	No	Yes	No	Yes	Yes	Yes
[19] 2011	3 input	1 DVCCTA	3	Yes	LP, BP, HP = No, Notch & AP = Yes	Yes	No	Yes	Yes	Yes
[20] 2011	3 input	2 CCCII	2	Yes	No	Yes	Yes	Yes	No	Yes
[21] 2011	3 input	4 CDTA	4	Yes	No	Yes	No	Yes	No	Yes
[22] 2012	3 input	2 CCCCTA	2	Yes	LP, BP. HP, Notch & AP = Yes	Yes	No	Yes	Yes	Yes
[23] 2013	3 input	2 VDTA	2	Yes	LP, BP. HP, Notch & AP = Yes	Yes	Yes	Yes	Yes	Yes
[24] 2013	3 input	2 CCCII	2	Yes	LP, BP. HP, Notch & AP = Yes	Yes	Yes	Yes	No	Yes
Our work	3 input	1 CCDDCCTA	2	Yes	LP, BP = No, HP, Notch & AP = Yes	Yes	No	Yes	Yes	Yes