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A Broadband Highly Balanced On-Chip Transformer Balun

An on-chip transformer and balance technology, which is applied to waveguide devices, electrical components, connection devices, etc., can solve the problem that the transformer Balun cannot achieve low loss and low reflection at the same time, and achieve expanded working bandwidth, high balance, and compactness sexual effect

Active Publication Date: 2017-10-03
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to propose an on-chip transformer balun with broadband and high balance, so as to solve the problem that the existing transformer balun cannot achieve low loss, low reflection and high balance at the same time in low-frequency applications such as S-band.

Method used

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  • A Broadband Highly Balanced On-Chip Transformer Balun
  • A Broadband Highly Balanced On-Chip Transformer Balun
  • A Broadband Highly Balanced On-Chip Transformer Balun

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Embodiment Construction

[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] Such as figure 2 As shown, a broadband high-balance on-chip transformer balun includes two first primary coils L1 and second primary coils L2 with the same wire width (the two form the primary coil), the secondary coil L3 and a metal ground plane . Different from Figure 1(a), figure 2 The connection relationship between the first primary coil L1 and the second primary coil L2 is cut off, and the center tap of the primary coil and the center tap of the secondary coil L3 are connected together and connected to the ground to realize a good single-ended-differential conversion function.

[0031] The center taps of the two planar spiral inductors constituting the primary coil and the secondary coil L3 are led out from half the length of the respective metal wires used to achieve good phase and amplitude balance at the same time. ...

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Abstract

An on-chip transformer balun (Balun) with wide band and high balance belongs to the field of radio frequency devices. The present invention comprises two primary coils and one secondary coil. The two primary coils are formed by disconnecting an inductor with a center tap near the center tap, and the secondary coil is a planar spiral inductor with a center tap. The primary and secondary coils are nested with each other to increase the coupling coefficient. The center taps of the primary and secondary coils are connected together and ultimately connected to the ground plane. Designing the transformer Balun according to the above-mentioned scheme can solve the problems of narrow working frequency band, poor phase balance, large insertion loss and return loss when the existing transformer Balun works at low frequency. The invention can be used in the occasion where single-end-differential conversion needs to be completed in the integrated circuit design on the chip.

Description

technical field [0001] The invention belongs to the field of radio frequency devices, and relates to an on-chip passive balun (Balance-to-Unbalance, hereinafter referred to as Balun), in particular to an on-chip transformer balun with broadband, low loss, and high balance performance. Background technique [0002] The balun is often used in the occasion where the front end of the RF transceiver needs to perform single-ended and differential signal conversion. There are mainly two types of baluns with existing structures, namely: Marchand balun and transformer balun. The advantage of Marchand Balun is that it has a wide operating bandwidth and low reflection. As reported in the article "Balance-Compensated Asymmetric MarchandBaluns on Silicon for MMICs", at present, on-chip Baluns have been widely used in millimeter-wave circuits, thanks to the inverse proportional relationship between the size of passive devices and the operating frequency. However, as described in the art...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P5/10
Inventor 杨格亮许仕龙杜克明王明魏恒刘长龙
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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