Current Controlled Current Sources (CCCS):

Op-amp realisation of CCCS may be acquired by cascading CCVS and VCCS as illustrated in Figure

Figure: Realization of Current-controlled Current Source

 There are several situations where one needs circuits capable of performing addition of analog voltages. Realisation of inverting, non-inverting and generalized summers are illustrated in Figures (a)-(c). The analysis and verification of the function of the circuits of Figure is left to the reader as exercise.

Figure: Realisation of Various Summers (a) Inverting Summer; (b) Non-inverting Summer; and (c) Generalized Weighted Summer