On the minimum power of feedback-type active RC networks

The definite drawback of the active RC network over its equivalent LC network is the fact that the former consumes power. There are so many papers which deal with synthesis methods and sensitivity of active networks, but very few of these papers treat their power problems. The minimum necessary power which is supplied by all amplifiers in the feedback-type RC active network is described. First, we deal with the minimum power of the feedback-type active network containing ideal transformers, then the minimum power of the network without any ideal transformer is given. It is also shown that we can always realize any transfer function with the minimum power network. An illustrative example is given to compare the minimum power of a practical network.