1 Introduction The traditional phase difference measuring instrument needs to adopt multiple small and medium scale integrated circuits, which not only has complicated circuit, low precision in measuring phase difference, but also has a narrow frequency range, and can only measure low frequency or intermediate frequency signals. This article describes a wideband phase difference and frequency measurement system designed using the AD8302 phase detector from ADI. The system accurately measures the gain, phase difference and frequency of two independent radio frequency (RF), intermediate frequency (IF) or low frequency signals. Can be widely used in Global System for Mobile Communications (GSM), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Time Division Multiple Access (TDMA) mobile phones, Personal Communication Services (PCS), and Broadband Infrastructure Networks. field. 2 AD8302 performance characteristics The AD8302 contains two precision-matched wideband log amps, a wideband phase detector, a 1.8V precision reference, and analog calibration and interface circuitry to simultaneously measure two input signals from low frequency to 2.7 GHz. Gain (also known as amplitude ratio) and phase difference. The device's internal integration of two precision-matched log amps minimizes temperature drift. The AD8302 not only measures the gain and phase difference of circuits such as amplifiers and mixers, but is also particularly suitable for the detection of wireless base stations and test equipment. When measuring gain, the dynamic range of the two input signals is ±30dB, the sensitivity of the output level is 30mV/dB, and the error is less than 0.5dB. The output voltage corresponding to -30dB is 30mV, and the output voltage corresponding to +30dB is 1.8V. The output current is 8mA and the slew rate is 25V/μs. The range of the measured phase difference is 0°-180°, the corresponding output voltage varies from 0V to 1.8V, the output voltage sensitivity is 10mV/degree, and the measurement error is less than 0.5°. When the phase difference Δψ=0°, the output voltage is 1.8V; when Δψ=180°, the output voltage is 30mV and the output current is 8mA. The phase conversion rate is 30MHz and the response time is 40ns-500ns (depending on the measured phase difference). The AD8302 also has three modes of operation: phase measurement mode, input level comparator mode, and phase controller mode. The phase controller can be constructed using the phase control mode. The small signal envelope bandwidth of the gain and phase difference is 30MHz (opening the MFLT terminal), and the external filter capacitor can be used to reduce the bandwidth. For a phase difference measurement system with a characteristic impedance of 50 Ω, the input power level ranges from -60 dBm to 0 dBm. Computer Screen Protector,Screen Protector For Computer,Screen Protector,Best Computer Screen Protectors Guangdong Magic Electronic Limited , https://www.magicmax.cc