| The six-port concept is first proposed in the seventies of the last century. It is composed of passive components including the power splitter and power bridges, so its structure is simple. The initial six-port technology is primarily used in the field of microwave measurements, and later, the six-port technology also has a wide range of applications in the field of wireless communication because of its inherent advantages. This paper is about the application for zero-IF receiver based on six-port technology in the phase measurement.The main purpose of this paper is to complete a receiver front-end which can match with the antenna and digital signal processing unit. The main contents include:This paper first introduces the principle of the six-port technology, the development situation, calibration methods, and its main applications, and then makes comparison between the six-port receiver and several common forms of receiver, such as the superheterodyne receiver. After that a receiver front-end based on six-port technology is designed according to the users’requirements, and also its block diagram and detailed design steps is given. Dimensions of the six-port receiver are given by the users. In order to avoid crosstalk, the overall structure including several independent module, such as matrix switch, digitally controlled attenuator, limiting amplifier, the AP circuits, six-port junction circuit and differential amplifier, is divided into five levels.This kind of structure can not only avoid crosstalk but also make the assembly and debugging convenient.The paper also analyzes the self-excited and crosstalk encountered in circuit debugging process, and makes solutions for these problems. Also redesign of the six-port junction circuit is introduced, and the paper gives a comparison of the data results before and after the redesign.Finally, this paper gives data results and the summary, and the results prove that the design fully meet the indicators given by the user. |
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