Sine wave phase difference accurate measurement circuit and measurement method thereof

Abstract

The invention discloses a sine wave phase difference accurate measurement circuit and a measurement method thereof, the device comprises a first branch and a second branch, the first branch comprises a first coupler, a first AGC amplitude automatic gain controller, a numerical control phase shifter, an AD8302 phase difference measurement module and a measurement result processing module which are connected in sequence; the first branch comprises a first coupler, a first AGC amplitude automatic gain controller, an AD8302 phase difference measurement module and a measurement result processing module, the second branch comprises a second coupler, a second AGC amplitude automatic gain controller, an AD8302 phase difference measurement module and a measurement result processing module which are connected in sequence, the first branch and the second branch share the AD8302 phase difference measurement module and the measurement result processing module, and the output of the second AGC amplitude automatic gain controller is directly connected to the AD8302 phase difference measurement module. And the measurement result processing module CPU is also electrically connected with the numerical control phase shifter. The circuit is an embedded circuit and is low in cost, small in size and high in practicability, and the method is high in measurement speed and accuracy.

Description

technical field [0001] The invention relates to a precise measurement technology of communication radio waves, in particular to a precise measurement circuit of a sine wave phase difference and a measurement method thereof. Background technique [0002] In the field of communication, almost all signals are transmitted by radio waves, among which the transmission of sine waves is used as the most basic signal for the carrier wave of radio waves, the clock local oscillator of large electronic systems, and so on. Due to the extremely wide bandwidth of optical communication transmission, more and more radio frequency signals are directly transmitted by optical fiber. For example, in the transmission and reception of phased array radar, multi-channel short-wave antenna signal reception, satellite signal reception, etc., there is no need to perform A / D and D / A conversion during long-distance transmission, and the radio frequency signal can be directly modulated to transmission in...

AI Technical Summary

Problems solved by technology

At present, most of the phase measurement signals use special instruments, but the special instruments are generally large in size and are not suitable for real-time monitoring and mobile measurement.

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