A Differential Pair Interface Based on Circulator

Abstract

The invention belongs to the field of PCB circuit design, in particular to a differential pair interface based on a circulator. The differential pair interface includes a microstrip hybrid ring, the input terminal of the microstrip hybrid ring is connected to a 50Ω RF port, and the isolation terminal of the microstrip hybrid ring is connected to a 50Ω surface mount resistor; the differential pair interface also includes a differential pair line, forming a differential pair The input port of each microstrip line of the line is connected to the microstrip hybrid ring via a matching balun: the microstrip hybrid ring, 50Ω surface mount resistor, matching balun, and differential pair are attached to one side of the dielectric board , the other side of the dielectric board is covered with copper; the dielectric board is provided with an air cavity. The invention has compact structure and high working reliability, not only can directly convert the radio frequency signal into a differential signal on the PCB board, so as to be sent to the required integrated chip, but also can ensure the compactness and simplification of the overall structure, In order to meet the application requirements of increasingly miniaturized and integrated products.

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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