Summing Integrator

Summing Integrator:

Many useful circuits can be designed using the basic integrator circuit. One of such useful circuits is the summing integrator.

It can be obtained by applying more than one input to the basic integrator circuit. The circuit is shown in the Fig. 2.43.

Summing Integrator

The node B is ground hence node A is at virtual ground i.e. VA = 0. Hence we can write for various currents,

Summing Integrator

Integrating both sides,

Summing Integrator

Applying KCL at node A,

Summing Integrator

Substituting in (5),

Summing Integrator

The expression shows that the output is the integration of the sum of the input voltages. Hence the circuit is called as summing integrators.

Summing Integrator

 

 

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