Nullors in amplifier design for bandwidth using multiple feedbacks

The application of nullors in bandwidth design of amplifiers are discussed. Given an analog circuit and a desirable frequency response, the proposed methodology tries to modify the circuit to follow the response from a model circuit that performs the desirable frequency response. This is done by adding one or more feedback sub-circuits to the analog circuit so that its response can follow the response from the model circuit. The method uses nullors to achieve the goal, and it works for both linear and nonlinear circuits. Although the scope of this study can be generalized and cover a wide range of cases but here we limit ourselves only to bandwidth designs, using one or more nullors. The assumption is that by including one or more feedbacks the amplifier will adequately respond to the frequency requirements as specified. Two examples show ways of expanding and shrinking of the bandwidths in amplifiers.