RF coupler with adjustable termination impedance

摘要

Aspects of this disclosure relate to a radio frequency coupler and an adjustable termination impedance circuit. In an embodiment, an apparatus includes a radio frequency coupler and a termination impedance circuit configured to provide an adjustable termination impedance, in which the termination impedance circuit includes two switches and a passive impedance element in series between a reference potential and a selected port of the RF coupler, the selected port being one of an isolated port of the RF coupler or a coupled port of the RF coupler.

主权项

1. A radio frequency coupler comprising:
a power input port, a power output port, a coupled port, and an isolation port; a main transmission line electrically connected to the power input port and the power output port; a coupled line electrically connected to the coupled port and the isolation port; and a termination impedance circuit configured to provide an adjustable termination impedance, the termination impedance circuit including a first bank of switched impedances connected in series with a second bank of switched impedances, each of the first and second bank of switched impedances including a plurality of switched impedances connected in parallel with each other, each switched impedance including a switch in series with a passive impedance element, and the termination impedance circuit being electrically connected between a reference potential and a selected port of the radio frequency coupler, the selected port being one of the isolation port and the coupled port.