The AD8312 is a complete, low cost subsystem for the measurement of RF signals in the frequency range of 50 MHz to 3.5 GHz. It has a typical dynamic range of 45 dB and is intended for use in a wide variety of cellular handsets and other wireless devices. It provides a wider dynamic range and better accuracy than possible using discrete diode detectors. In particular, its temperature stable linear-in-dB response makes it suitable for temperature sensitive applications. The AD8312 has a fast response of 85/120 ns, making it well suited for high end data wireless applications such as RF basebands and transceivers.