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Balanced converter

A balun, balanced terminal technology, used in waveguide-type devices, fixed transformers or mutual inductances, components of transformers/inductors, etc.

Active Publication Date: 2022-03-11
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although such a type of balun is suitable for miniaturization and broadband expansion, there is room for improvement in the balance characteristics of two balanced signals.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0034] (Outline of communication device)

[0035] figure 1 It is a block diagram of the communication device 1 including the front-end circuit 10 to which the balun 100 according to Embodiment 1 is applied. refer to figure 1 , the communication device 1 includes an antenna ANT and an RFIC 20 as a signal processing circuit in addition to the front-end circuit 10 .

[0036] The RFIC 20 outputs a high-frequency signal to the transmission line TX, and radiates radio waves from the antenna ANT via the front-end circuit 10 . Moreover, RFIC20 receives the radio wave received by the antenna ANT from the receiving side line RX, processes this received signal, and transmits it to the circuit of a subsequent stage.

[0037]The front-end circuit 10 includes, in addition to the balun 100 , a switch SW, filters FLT1 , FLT2 , a power amplifier PA, and a low-noise amplifier LNA. The switch SW is used to switch between transmission and reception of radio waves in the antenna ANT. The swit...

Embodiment approach 2

[0083] In Embodiment 1 and its modifications, the case where the impedance of the device connected to the balanced terminal is equal to the impedance of the device connected to the unbalanced terminal, or the case where the impedance is higher has been described.

[0084] On the other hand, there are cases where the impedance of a device connected to a balanced terminal is made lower than the impedance of a device connected to an unbalanced terminal. In this case, generally, the number of windings of the coil forming the balanced line in the balun is reduced, the number of windings of the coil forming the unbalanced line is increased, or the capacitance of the capacitor C1 for wavelength adjustment is increased. achieve the desired impedance ratio. However, when the impedance on the balanced line side is low, it is necessary to further increase the degree of capacitive coupling between the unbalanced line and the balanced line in order to match the resonance frequency of the b...

Embodiment approach 3

[0104] In the example of the balun described in Embodiment 1 and Embodiment 2, as Figure 6 as well as Figure 13 As shown, a structure in which each line is formed of coils extending over two layers has been described. When this balun is used in a low frequency range, it may be necessary to further increase the line length of the coil. In this case, depending on the frequency of the object of use, the desired line length cannot be achieved in two layers, and the coil may need to be formed over more layers.

[0105] Here, as in the example of the balun in the present disclosure, in the case where external electrodes for connection with external devices are formed on the side surfaces of the dielectric substrate (refer to Figure 4 ), preferably the end connected to the external electrode in each line is located at the outer periphery of each dielectric layer. However, in the case of forming a spiral coil using an odd number (for example, three) of dielectric layers, the coi...

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Abstract

A balance converter (100) is provided with an unbalanced terminal (T1), balanced terminals (T2, T3), and lines (L1) to (L4), and converts a signal between an unbalanced line and a balanced line. The line (L1) is connected between the unbalanced terminal (T1) and a reference potential. The line (L2) is coupled to a line (L1) connected between the balance terminal (T2) and a reference potential. The line (L3) is coupled to a line (L1) connected between the balance terminal (T3) and a reference potential. The line (L4) is connected in parallel with the line (L2) and is coupled to the line (L3). The line (L4) is configured to pass a signal having an opposite phase with respect to the signal passing through the line (L3). As a result, it is possible to provide a balance converter having improved balance characteristics while achieving miniaturization and broadband.

Description

technical field [0001] The present disclosure relates to a balun that converts a signal between an unbalanced line and a balanced line, and more specifically, relates to a structure for improving characteristics in a stacked type balun. Background technique [0002] A balanced converter (Balun) is a converter used for mutual conversion between an unbalanced signal and a balanced signal. Balanced signals are a pair of signals with equal amplitudes and opposite phases, and are generally used in differential amplifier circuits and the like in ICs in communication systems. On the other hand, the unbalanced signal is a signal for transmitting a change in potential with respect to the ground potential, and corresponds to a signal input and output of a microstrip line or an antenna. [0003] Patent Document 1: Japanese Patent Laid-Open No. 2016-086327 [0004] In mobile wireless communication devices such as smartphones and mobile phones, baluns are used in front-end circuits for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P5/10
CPCH01P5/10H03H2001/0085H03H7/422H01F27/2804H01F2027/2809H01F19/04H03H7/42
Inventor 佐藤拓也
Owner MURATA MFG CO LTD
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