Methods and devices for overcoming insertion loss in RF systems

摘要

Methods and devices are described for overcoming insertion loss notches in RF systems. In one case programmable impedances are used to move an insertion loss notch outside a frequency band of interest.

主权项

1. A radio frequency (RF) circuital arrangement comprising:
a first RF path comprising a first configurable impedance network and one or more RF devices; a second RF path comprising a second configurable impedance network and one or more RF devices; an antenna; and an antenna switch connected to a first node of the first RF path and to a second node of the second RF path, the antenna switch configured to selectively couple the first node and the second node to the antenna, wherein in a first mode of operation of the RF circuital arrangement:
(i) the antenna switch provides a low impedance resistive coupling between the first node and the antenna,(ii) the antenna switch provides a high impedance capacitive coupling between the second node and the antenna, so that an impedance of the second RF path seen at the second node is capacitively coupled to the first node, and(iii) the second configurable impedance network of the second RF path is configured to affect the impedance seen at the second node so as to reduce an insertion loss of the RF signal at the first node due to the capacitive coupling of the impedance seen at the second node to the first node.