Novel passive balun structure and balanced mixer

Abstract

The invention discloses a novel passive balun structure, wherein a differential signal terminal of the balun structure is connected with a compensation structure; the compensation structure comprisesa phase shifter and a compensation resistor; the phase shifter and the compensation resistor are directly connected; the phase shifter is a left-handed material phase shifter or a right-hand materialphase shifter; two passive balun structures are designed in a passive double-balanced mixer; a single-ended port of the first passive balun structure is connected with a local oscillation signal, thesingle-ended port of the second passive balun structure is connected with a radio frequency signal input/output end, and four differential ports of the two passive balun structures are cross-connectedto a mixing unit; the differential port of the second passive balun structure leads to an intermediate frequency signal output/input end through a filtering/matching circuit. In the case of hardly influencing the balun loss and degree of balance, the port matching degree of the balun and the isolation degree of the differential signals are greatly improved through the compensation structure; andthe improved balun is applied to the balanced mixer, so that the performances of the mixer are improved to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of radio frequency / millimeter wave wireless communication integrated circuits, and aims to improve the traditional passive balun structure and obtain a new high-performance passive balun structure and a balanced mixer thereof. Background technique [0002] In recent years, the development of radio frequency / millimeter wave high-speed wireless communication systems has been very rapid. As the core module of the wireless communication system, the transceiver front-end integrated circuit directly determines the quality of the wireless communication system. The mixer is a key component in the front-end integrated circuit of the transceiver: the front-end of the transmitter converts the low-frequency signal to be transmitted into a high-frequency signal, and the front-end of the receiver converts the received high-frequency signal into a low-frequency signal. implemented by the frequency converter. [0003] Freq...

AI Technical Summary

Problems solved by technology

[0009] The invention aims at the problems of poor port matching characteristics and port isolation existing in the traditional passive balun structure, improves the traditional passive balun structure, and proposes a new passive balun structure and its balanced hybrid frequency converter, without affecting the loss and balance of the balun, the port matching degree of the balun and the isolation between differential signals are greatly improved, and the improved balun is used in a balanced mixer. The performance of the frequency converter has been improved to a certain extent

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