DIRECTIONAL COUPLER

摘要

Directional couplers are used to detect forward power delivered by a power amplifier. Mechanisms are provided herein which improve the accuracy of the power detection in the presence of external noise. Accuracy in power detection can be used to simplify the design of the power control loop.

主权项

1. A coupler, comprising:
a main branch coil configured to receive current from a monitored circuit and carry the current through the main branch coil; a coupled branch coil positioned in proximity to the main branch coil and configured to detect an amount of current flowing in the main branch coil via an inductive coupling between the coupled branch coil and the main branch coil, wherein at least one of the main branch coil and coupled branch coil are configured to at least partially reject external magnetic fields that are created by circuit elements other than the main branch coil.