Lossless, broadband monolithic microwave active inductors

Lossless, broadband microwave active inductors are proposed for general-purpose use in microwave circuits. These active inductors operate in a wide frequency range with very low series resistance. They are composed of a common-source cascode FET and a feedback FET which is a common-gate FET or a common-gate cascode FET. The loss can be less than 1/8 the loss of the previously proposed active inductor. The inductance value can be controlled by the external control voltage. The configuration and performance of these devices are described.<>