Apparatus and method for detecting radio frequency power

摘要

Apparatus and methods are disclosed related to radio frequency (RF) power detection. One such apparatus includes a directional coupler, an RF switch, and an RF power detector. The RF switch can selectively change coupling between the directional coupler and the RF power detector. This can enable accurate power detection based on a ratio of power levels, without factory calibration or laser trimming.

主权项

1. An apparatus comprising:
a switch having at least a first node, a second node, and a third node, wherein the switch is configured to selectively operatively couple at least one of the first node or second node to the third node in response to a control signal; and a radio frequency (RF) power detector having a detector input, wherein the RF power detector is configured to generate a signal indicative of RF power at the detector input as an output of the detector, wherein the detector input is electrically coupled to the third node of the switch, wherein the signal indicative of power of the RF signal represents a forward RF power when the first node of the switch is operatively coupled to the third node of the switch, and wherein the signal indicative of power of the RF signal represents a reflected RF power when the second node of the switch is operatively coupled to the third node of the switch.