Improved switched current wave filter configurations based on microwave prototypes

A new configuration of a parallel adaptor with half-period delayed reflected waves, which can be used for implementing switched current wave filters based on microwave reference prototypes, is presented. A modified signal flow graph has been used so that the delays required for simulating the unit elements in the reference filter are produced by the adaptor itself. As a result, the number of required current inversions is reduced and thus lower sensitivity to MOS transistor parameter mismatch is achieved, compared to the corresponding already known implementations.