Differential pair interface based on circulator

Abstract

The invention belongs to the field of PCB (printed circuit board) design, and particularly relates to a differential pair interface based on a circulator. The differential pair interface comprises a microstrip hybrid loop and a differential pair, an input end of the microstrip hybrid loop is connected with a 50-omega radio frequency port, an isolation end of the microstrip hybrid loop is connected with a 50-omega surface-mount resistor, an input port of each microstrip forming the differential pair is connected to the microstrip hybrid loop through a matching balun, the microstrip hybrid loop, the 50-omega surface-mount resistor, the matching balun and the differential pair are attached to one side face of a dielectric plate, another side face of the dielectric plate is coated with copper, and an air cavity is formed in the dielectric plate. The differential pair interface is compact in structure and high in working reliability, radio frequency signals can be directly transformed into differential signals on a PCB, and the differential signals are conveniently transmitted into a needed integrated chip. Besides, compactness and simplicity of a whole structure can be ensured, and products can be more miniaturized and integrated to meet application requirements.

Description

technical field [0001] The invention belongs to the field of PCB circuit design, in particular to a differential pair interface based on a circulator. Background technique [0002] In traditional wireless transceiver designs, 50Ω single-ended interfaces are widely used in RF and IF circuits, while in modern transceiver designs, differential interfaces are often used in high-frequency circuits for better performance. A single-ended signal is an unbalanced signal, measured by the difference between the signal and a fixed reference point; once a source of error is introduced into the signal path, problems can arise. Therefore, single-ended signals are susceptible to noise and electromagnetic coupling interference. Differential signals consist of pairs of balanced signals that are equal in magnitude and opposite in phase; the difference between the positive and negative balanced signals corresponds to the composite differential signal. If an error is introduced into a differen...

AI Technical Summary

Problems solved by technology

The interconnection between the traditional 50Ω single-ended interface and the differential signal is realized by means of differential amplifier circuit or single-ended-differential converter. On the one hand, this kind of method has a large circuit area, which is obviously not suitable for the increasingly small In the design of highly integrated and highly integrated products; on the other hand, the structure is also relatively complex, which brings high production and development costs

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