In this article, we use analog filters to explore sensitivity analysis as this information is often critical to good filter design. This can be any circuit characteristic: amplifier gain bus receiver input impedance an RF port's voltage standing wave ratio or a digital gate threshold voltage. Fortunately, this important topic is easy to learn and use and is covered in circuit design books, especially those focusing on filter design.Ī simple, if imprecise, definition of circuit sensitivity is how much a particular circuit characteristic changes as a particular component value varies. Generally, circuit sensitivity analysis is not part of the bachelors curriculum in most universities' electrical engineering programs. Deeper use of sensitivity analysis can lead designers to modify circuit topologies, or make completely different choices in order to optimize these trade offs.
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With this knowledge, the designer can better decide how to balance any trade offs between performance and cost. The wise circuit designer learns how to analyze the sensitivities of circuits' critical characteristics to the variations in the components. These characteristics also can vary over time and environmental conditions. Even their most fundamental characteristics, for example a resistor's resistance, will be at least slightly different from the specified value. Invariably, these parts are non-ideal in many ways. Part 2: Circuit Sensitivity Analysis–An Important Tool for Analog Circuit DesignĪll circuits, analog or digital, have characteristics dependent on the values of their component parts.
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