Broadband, low-loss and high-balance-degree on-chip Balun

Abstract

The invention discloses a broadband, low-loss and high-balance-degree on-chip Balun. The broadband, low-loss and high-balance-degree on-chip Balun is provided with four regular-octagon plane spiral coils which are shaped like disc-like mosquito coils, the four regular-octagon plane spiral coils comprise two balance coils and two unbalance coils, the balance coils are arranged at the upper part, the unbalance coils are arranged at the lower part, an insulation layer is arranged between the balance coils and the unbalance coils, and an unsymmetrical broadside coupling structure is formed by the balance coils and the unbalance coils; an outer end point of a balance coil with narrower line width is used as an input, an outer end point of a balance coil with wider line width is suspended in the air, and inner end points of the two balance coils are connected through a metal guide line; and outer end points of the two unbalance coils are connected to input reference ground, inner end points of the two unbalance coils are respectively led out for being used as two outputs of a converter, and output reference ground and the input reference ground are connected through isolating lines of the balance coils and the unbalance coils.

Description

technical field [0001] The present invention proposes a wide-band, low-loss, high-balance on-chip balun, which can completely cover the Ka band, Q band, and U band, as well as cover the low frequency part of the V band and the high frequency part of the K band, and is suitable for use in these frequency bands Single-ended – differential conversion required. It belongs to the field of radio frequency technology. Background technique [0002] Balun (Balance-to-Unbalance, Balun) is often used in mixers, differential amplifiers and other occasions that need to convert single-ended signals into differential signals. The development of integrated circuit design technology puts forward more and more requirements for system bandwidth, and the mixer and differential amplifier, which are important components of the system, are often limited by the performance of the balun, making it difficult for the overall circuit performance to meet the system requirements. This is because it is ...

AI Technical Summary

Problems solved by technology

The development of integrated circuit design technology has put forward more and more requirements for system bandwidth, and the mixer and differential amplifier, which are important components of the system, are often limited by the performance of the balun, making it difficult for the overall circuit performance to meet the system requirements.

This is because it is difficult for a balun with a traditional structure to simultaneously achieve low loss and high balance performance over a very wide frequency band.

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