High frequency signal detector

摘要

A micro-power, micro-size RF detector is suitable for implementation on an integrated circuit. The detector is used for detecting the presence of high frequency AC signals on a transmission line which has a transmission line impedance. An input for connection to the transmission line through a high impedance relative to the transmission line is provided. A current mode detector is coupled to the input. The current mode detector translates AC signals on the input to a bias signal having a DC component determined by power of the AC signal on the transmission line. A current mode amplifier is coupled to the current mode detector, and amplifies the bias signal to produce a detector current. A binary output driver is coupled to the current mode amplifier, which generates a binary signal having one binary level if the detector current exceeds a high signal threshold, and another binary level if the detector current falls below a low signal threshold.