Analog Devices,inc.

Jinzhou Cao

Xudong Wang

Song Lin

Christopher Eugene Hay

The present subject matter relates to active balun circuits. An active balun circuit includes a plurality of transistors; an output transmission line connected to output terminals of the transistors; an input transmission line; and a plurality of serial capacitors coupled to an input terminal of the transistors and the input transmission line.

Active balun design

Systems, devices, and methods related to phase shifters are provided. An example apparatus includes a first node to receive an input signal, a second node, a first signal path coupled between the first node and the second node, and a second signal path coupled between the first node and the second node. The first signal path includes a positively coupled transformer. The second signal path includes a negatively coupled transformer. The second signal path is out-of-phase with the first signal path at the second node. The apparatus further includes a plurality of switches to select the first signal path or the second signal path. The apparatus may further include tuning capacitors to improve phase-shifting performance of the apparatus.

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Hillsboro, OR, United States of America

Jinzhou Cao