ABSTRACT
These include adders, difference amplifiers, integrators, ramp generators, triggering circuits and active filters.
The amplifier shown below is an extension of the inverting amplifier and depends on the virtual earth at the inverting input of the op amp. The version shown has four inputs, but there may be any practicable number of inputs, each with its input resistor. In the figure, all resistors have the same value and a suitable value is 10. k .
