Читать книгу Handbook of Microwave Component Measurements - Joel P. Dunsmore - Страница 67

In the measurement sense, one definition of linear devices is that they are devices in which the output power is a linear function of the input power. If the input power is doubled, the output power is doubled. Almost all passive devices follow this rule, and many active devices as well. An alternative definition of linear is one for which only frequencies that are available at the input appear at the output. In practice, the first definition is more useful for system response. Some important characteristics of active components are discussed next.