CN100536330C

CN100536330C - Balance to unbalance converter

Info

Publication number: CN100536330C
Application number: CNB2005101086231A
Authority: CN
Inventors: 史承彦
Original assignee: Delta Optoelectronics Inc
Current assignee: Taida Electronic Industry Co Ltd; Delta Optoelectronics Inc
Priority date: 2005-10-10
Filing date: 2005-10-10
Publication date: 2009-09-02
Anticipated expiration: 2025-10-10
Also published as: CN1949665A

Abstract

The invention is a balance-unbalance converter, comprising a transformer and a biased feed-in circuit, where the transformer has an unbalanced signal I/O circuit and a balanced signal I/O circuit; and the biased feed-in circuit is connected with the balanced signal I/O circuit.

Description

Balance-to-nonbalance converter

Technical field

(balance line to unbalance linetransition Balun), particularly relates to a kind of balance-to-nonbalance converter with bias voltage feeding (dadf) function to the present invention relates to a kind of balance-to-nonbalance converter.

Background technology

Please refer to Figure 1A, it is a schematic diagram that shows known mobile communcations system.Shown in Figure 1A, a kind of known mobile communcations system 10 comprises an antenna 12, a front-end module (front end module) 14 and one signal transceiver (transceiver) 16.Front-end module 14 comprises a transceiver toggle switch 18, a balance-to-nonbalance converter (Balun) 20, a band pass filter (bandpass filter, BPF) 22 and one low pass filter (lowpass filter, LPF) 24.In addition, signal transceiver 16 comprises a reception amplifier (receiving amplifier) 26 and one transmission amplifier (transmittingamplifier) 28.

After this mobile communcations system 10 receives wireless signal, this antenna 12 is sent to this signal this transceiver toggle switch 18 of this front-end module 14, at this moment, this transceiver toggle switch 18 switches to the signal receiving formula, and above-mentioned signal is passed to this band pass filter 22, behind the signal beyond these band pass filter 22 filtering special frequency bands, this balance-to-nonbalance converter 20 converts the signal that this has special frequency band to the balance signal by non-equilibrium signal, this reception amplifier 26 that is resent to this signal transceiver 16 amplifies above-mentioned balance signal, can hear in order to people's ear.On the contrary, when these mobile communcations system 10 desires externally transmit wireless signal, above-mentioned signal is sent to this low pass filter 24 after amplifying via this transmission amplifier 28, is sent to this transceiver toggle switch 18 by the signal of these low pass filter 24 filtering special frequency channel again.At this moment, this transceiver toggle switch 18 switches to the signal emission mode and is sent to this antenna 12 so that above-mentioned signal is sent out.

Please refer to shown in Figure 1B, known balance-to-nonbalance converter 20 utilizes the conversion of a transformer as balance signal and non-equilibrium signal usually again.Yet, can obtain working power in order to make this reception amplifier 26, the general practice is to add that between this balance-to-nonbalance converter 20 and this reception amplifier 26 a bias voltage loop 30 is to be fed into working power this reception amplifier 26.This bias voltage loop 30 comprises two AC signal isolated

loops

32,34, its usually by one or multiple unit capacitor and inductor formed.Because the working power of this reception amplifier 26 must be DC power supply (DC), therefore utilize this AC signal isolated

loop

32,34 to prevent by input S ₁, S ₂The bias voltage signal doping AC signal of being imported also inputs to this reception amplifier 26, and causes the infringement of system.In addition, be subjected to this balance-to-nonbalance converter 20 short circuits, therefore in this bias voltage loop 30, capacitor C must be set again in order to prevent the bias voltage signal ₁, C ₂To avoid the bias voltage signal to be subjected to short circuit and to make thrashing.

As mentioned above, known technology must be added this bias voltage loop 30 between this balance-to-nonbalance converter 20 and this reception amplifier 26, not only increases the cost of part material, and can increase the occupied space of part.In addition, between this balance-to-nonbalance converter 20 and this reception amplifier 26, because be provided with this bias voltage loop 30, it can disturb the signal that transmits in system, and make the insertion loss (insertion loss) of system increase, wherein, insert the ratio that loss is input signal and output signal.Therefore, will how to reduce number of spare parts reducing cost in having the system of balance-to-nonbalance converter, and reduce the insertion loss of system, be one of current important topic.

Summary of the invention

In view of above-mentioned, purpose of the present invention is for a kind of balance-to-nonbalance converter with bias voltage feeding (dadf) function is provided, to reduce cost and to insert loss.

For achieving the above object, a kind of balance-to-nonbalance converter according to the present invention comprises a transformer and a biased feed-in circuit.Wherein, this transformer has a non-equilibrium signal I/O loop and a balance signal I/O loop; This biased feed-in circuit is electrically connected with this balance signal I/O loop of this transformer.

As mentioned above, a kind of balance-to-nonbalance converter according to the present invention directly is integrated in biased feed-in circuit in the transducer, therefore when using balance-to-nonbalance converter, do not need additionally to make the AC signal isolated loop again and with the bias voltage feed-in as the known practice, can reduce the expenditure of cost of parts, also can reduce the occupied space of part, and can reduce and insert loss.

Description of drawings

Figure 1A is for showing a schematic diagram of known mobile communcations system;

Figure 1B is for showing a part of schematic diagram of known mobile communcations system;

Fig. 2 is for showing the schematic diagram according to the balance-to-nonbalance converter of preferred embodiment of the present invention; And

Fig. 3 is for showing the application schematic diagram according to the balance-to-nonbalance converter of preferred embodiment of the present invention.

The reference numeral explanation

10 mobile communcations systems, 12 antennas

14 front-end modules, 16 signal transceivers

18 transceiver toggle switch, 20 balance-to-nonbalance converters

22 band pass filters, 24 low pass filters

26 reception amplifiers 28 transmit amplifier

30 bias voltage loops, 32,34 AC signal isolated loops

C ₁, C ₂Capacitor S ₁, S ₂Input

4 balance-to-nonbalance converters

41 transformers, 42 biased feed-in circuits

411 non-equilibrium signal I/O loops

412 balance signal I/O loops

50 filters, 60 driving components

B ₁The first bias voltage feed side B ₂The second bias voltage feed side

C ₃The first capacitor C ₄Second capacitor

E ₁Non-equilibrium signal input/output terminal

E ₂The first balance signal input/output terminal

E ₃The second balance signal input/output terminal

W ₁The first coil W ₂Second coil

W ₃Tertiary coil

Embodiment

Hereinafter with reference to relevant drawings, a kind of balance-to-nonbalance converter of the preferred embodiment according to the present invention is described, wherein identical assembly will be illustrated with identical label.

Please refer to shown in Figure 2ly, a kind of balance-to-nonbalance converter 4 of preferred embodiment of the present invention can be applicable to an antenna system, and this balance-to-nonbalance converter 4 comprises a transformer 41 and a biased feed-in circuit 42.In the present embodiment, this transformer 41 and this biased feed-in circuit 42 can be with low temperature co-fired multi-layer ceramics (Low-Temperature Cofired Ceramics, LTCC) technology and making.

This transformer 41 has a non-equilibrium signal I/O loop 411 and a balance signal I/O loop 412.In the present embodiment, this non-equilibrium signal I/O loop 411 comprises one first coil W ₁, and this balance signal I/O loop 412 comprises one second coil W ₂With a tertiary coil W ₃, this first coil W wherein ₁Respectively with this second coil W ₂And this tertiary coil W ₃Couple (coupling).In the present embodiment, this first coil W ₁Has a non-equilibrium signal input/output terminal E ₁, this second coil W ₂Has one first balance signal input/output terminal E ₂, and this tertiary coil W ₃Has one second balance signal input/output terminal E ₃

This biased feed-in circuit 42 is electrically connected with this balance signal I/O loop 412 of this transformer 41, and in addition, this biased feed-in circuit 42 comprises at least one capacitor, the AC signal of being mixed in the bias voltage signal in order to the isolating exterior feed-in.In the present embodiment, this biased feed-in circuit 42 comprises one first capacitor C ₃With one second capacitor C ₄, this first capacitor C wherein ₃An end respectively with this second coil W ₂An end and one first bias voltage feed-in terminal separated B ₁Be electrically connected, and this second capacitor C ₄An end respectively with this tertiary coil W ₃An end and one second bias voltage feed-in terminal separated B ₂Be electrically connected, in addition, this first capacitor C ₃With this second container C ₄The other end be electrically connected to an earth terminal.

Please refer to Fig. 3 again, it shows according to one of the balance-to-nonbalance converter of preferred embodiment of the present invention uses schematic diagram.As shown in Figure 3, the balance-to-nonbalance converter 4 of preferred embodiment of the present invention is arranged between a filter 50 and the driving component 60, in order to do the effects such as conversion transmission of impedance matching, balance signal and non-equilibrium signal.In the present embodiment, this filter 50 can be a band pass filter, and this driving component 60 can be an amplifier (Amplifier) or a wireless transceiver (Transceiver).

In the present embodiment, this first coil W ₁This non-equilibrium signal input/output terminal E ₁Be electrically connected with this filter 50, and this second coil W ₂This first balance signal input/output terminal E ₂And this tertiary coil W ₃This second balance signal input/output terminal E ₃Be electrically connected with this driving component 60 respectively.Driving component 60 needed grid bias power supplies are then respectively by this first bias voltage feed side B ₁With this second bias voltage feed side B ₂Input in this balance-to-nonbalance converter 4, again by this first balance signal I/O end E ₂With this second balance signal I/O end E ₃Be sent to this driving component 60, and provide this driving component 60 required grid bias power supply.

Driving component 60 required grid bias power supplies are generally DC power supply, yet, by this first bias voltage feed side B ₁And this second bias voltage feed side B ₂Might the mix power signal (AC power signal) of high frequency of the grid bias power supply of institute's feed-in, and the power signal of this high frequency then can be subjected to this first capacitor C after feed-in balance-to-nonbalance converter 4 ₃And this second capacitor C ₄Isolation, and can not have influence on the operate as normal of driving component 60.

In sum, because of a kind of balance-to-nonbalance converter of the present invention is integrated the bias voltage feeding (dadf) function in wherein, when therefore being applied in the system, do not need to increase extra biased feed-in circuit again and provide driving component required working power, and can be directly with in the working power feed-in balance-to-nonbalance converter, can omit the required AC power isolated loop of the known practice, and can reduce the expenditure of cost of parts, also reduce the occupied space of part, insert loss simultaneously and also be minimized, and then the elevator system performance.

The above only is an illustrative, but not is restricted.Anyly do not break away from spirit of the present invention and category, and, all should be contained in the claim of the present invention its equivalent modifications of carrying out or change.

Claims

1. balance-to-nonbalance converter comprises:

One transformer has a non-equilibrium signal I/O loop and a balance signal I/O loop; And

One biased feed-in circuit, it is electrically connected with this balance signal I/O loop of this transformer,

Wherein this biased feed-in circuit comprises at least one capacitor.

2. balance-to-nonbalance converter as claimed in claim 1, wherein this transformer and this biased feed-in circuit are made with low temperature co-fired multi-layer ceramics technology.

3. balance-to-nonbalance converter as claimed in claim 1, wherein this non-equilibrium signal I/O loop comprises one first coil, this balance signal I/O loop comprises one second coil and a tertiary coil, and this first coil couples with this second coil and this tertiary coil respectively.。

4. balance-to-nonbalance converter as claimed in claim 1, wherein an end of this capacitor is electrically connected with an end of this second coil.

5. balance-to-nonbalance converter as claimed in claim 1, wherein an end of this capacitor is electrically connected with an end of this tertiary coil.

6. balance-to-nonbalance converter as claimed in claim 1, wherein a non-equilibrium signal input/output terminal in this non-equilibrium signal I/O loop is electrically connected to a filter.

7. balance-to-nonbalance converter as claimed in claim 6, wherein this filter is a band pass filter.

8. balance-to-nonbalance converter as claimed in claim 7, it is applied to an antenna system.

9. balance-to-nonbalance converter as claimed in claim 1, wherein this balance signal I/O loop comprises at least one balance signal input/output terminal.

10. balance-to-nonbalance converter as claimed in claim 9, wherein this balance signal input/output terminal in this balance signal I/O loop is electrically connected to a driving component.

11. balance-to-nonbalance converter as claimed in claim 10, wherein this driving component is an amplifier or a wireless transceiver.