The AD8302 measures the precise amplitude difference between the two input signals over 60dB dynamic range, scaled to provide the user with a 30 mV/dB output. The phase measurement range extends to 180 degrees and provides the user with a 10 mV/degree output scaling. The device integrates two wideband logarithmic amplifiers, a wideband linear multiplier/phase detector, precision 1.8 V reference source and analog scaling and interface circuitry, running of a single 2.7 -5.5 volt supply, all within a small form factor package.
The AD8302 has been characterized for use over the common cellular frequencies for GSM, CDMA/W-CDMA and TDMA (900 MHz, 1.8 GHz, 2.2 GHz) and specified out to 2.7 GHz for the emerging MMDS (Multipoint Multichannel Distribution Service) market. Additionally the part provides exceptional accuracy at lower IF frequencies.