Source allocation based on design criteria in analog circuits

A simple technique is presented that allocates the DC (voltage and current) sources in an analog design based on the design criteria provided. In cases where the main DC sources, such as supply batteries, are already assigned the technique uses other components such as current sources, current mirrors, and even “power-carrying components”, such as resistors, to match with the design criteria. The technique uses nullor pairs to pair the biasing design criteria with the power sources -locations and magnitudes - required for the biasing. Because the operating points of the transistors can be specified as part of the design criteria the technique allows the designer to linearized the circuit not only for the performance (AC) design but also for the biasing design. It is shown that the nullators keep the biasing criteria fixed during the analysis; whereas, the norators act as the place holders for the DC supplies or the power-carrying components. Finally some design examples are worked out, which demonstrate the capability of the presented technique in analog circuit designs.

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