WO2021174797A1 - 一种可切换环路增益的供电网络、信号处理系统及应用 - Google Patents
一种可切换环路增益的供电网络、信号处理系统及应用 Download PDFInfo
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- WO2021174797A1 WO2021174797A1 PCT/CN2020/113908 CN2020113908W WO2021174797A1 WO 2021174797 A1 WO2021174797 A1 WO 2021174797A1 CN 2020113908 W CN2020113908 W CN 2020113908W WO 2021174797 A1 WO2021174797 A1 WO 2021174797A1
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- 239000003990 capacitor Substances 0.000 claims description 35
- 230000003321 amplification Effects 0.000 claims description 3
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- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000003044 adaptive effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/02—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Definitions
- This application relates to a power supply network, a signal processing system and applications with switchable loop gain.
- Amplifier is any device that can make smaller energy to control larger energy, including class A amplifier, class B amplifier, class AB amplifier, class D amplifier, class T amplifier, radio frequency power amplifier, etc.
- radio frequency power amplifier RF PA
- the power of the radio frequency signal generated by the modulation oscillator circuit is very small, and it needs to go through a series of amplification, a buffer stage, an intermediate amplifier stage, and a final power amplifier stage to obtain sufficient RF power before it can be fed. Radiate to the antenna. In order to obtain sufficient RF output power, a RF power amplifier must be used.
- the amplifier includes one-stage, two-stage or multi-stage transistors.
- the input signal is amplified by one-stage, two-stage or multi-stage transistors and output.
- the bias signal is provided to make the transistor in the amplifier work.
- the circuit that provides the bias signal to the transistor in the amplifier is called the bias circuit.
- the upper block is the bias circuit
- the lower block is the radio frequency circuit.
- the radio frequency circuit includes a transistor Q1 and a transistor Q2.
- the bias circuit When the bias circuit is providing bias signals to the transistor Q1 and the transistor Q2, the bias circuit and the transistor in the amplifier form a closed loop, as indicated by the dashed line in FIG. 1.
- the signal to be amplified is input to the transistor Q1 after being amplified and then input to the transistor Q2 to be amplified.
- all the signals amplified by the transistor Q1 and Q2 will not enter the subsequent circuit.
- the signal amplified by the transistor Q2 will not be all output, and part of the signal will return to the transistor Q1 with the closed loop, and the transistor Q1 will return to the circuit again.
- the signal After the signal is amplified, it is input to the transistor Q2, and the transistor Q2 amplifies the signal before returning, and then loops in turn.
- This kind of signal that forms a loop in a closed loop is expressed in terms of loop gain. When the loop gain is greater than 1, the signal will continuously amplify in this closed loop to form an oscillating frequency, which will eventually cause the circuit to oscillate and cause the amplifier to be unstable.
- a capacitor C1 is connected to the bias circuit. Because the capacitor itself has parasitic inductance, in addition, the connection between the capacitor and the power supply and the ground is also equivalent to an inductance at radio frequency, causing the capacitor and the two inductances to resonate at a certain frequency when the capacitor is working, forming a resonant frequency. When the capacitor is in resonance, the impedance is 0 ohms.
- the oscillation frequency of the closed loop will enter the ground along the 0 ohm impedance formed by the capacitor C1, so that it is not in the closed loop.
- the continuous oscillation in the circuit eliminates the oscillation in the closed loop, avoids the oscillation in the closed loop, and ensures the stability of the amplifier. That is to say, the resonant frequency of the capacitor C1, the signal returned by the subsequent stage through the closed loop is grounded through the capacitor C1, that is, the signal loop is broken and no oscillation can be formed, which ensures the stability of the amplifier.
- Amplifiers usually integrate multi-stage amplifiers in one chip to process signals in different frequency bands. Take the power amplifier in a mobile phone as an example. There are usually two frequency bands, low frequency and intermediate frequency. In order to save costs, these two frequency bands will share a bias.
- the setting circuit provides a bias signal.
- the bias circuit In order to reduce the influence of the closed loop oscillation frequency, the bias circuit will use the above-mentioned method to process, that is, a capacitor is connected to the bias circuit, and the loop gain is eliminated through the capacitor.
- the loop gains of the low frequency and intermediate frequency are generally inconsistent, the circuit structure shown in Figure 1 cannot ensure that the amplifier is stable in different frequency bands.
- the purpose of the present application here is to provide a power supply network capable of generating a switchable loop gain of two resonant frequencies.
- the power supply network with switchable loop gain is used to provide a bias signal to a power amplifier, and includes a first filter circuit, a second filter circuit, and a switch.
- the second filter circuit forms a filter circuit with a different resonance frequency from the first filter circuit through the closed state or the open state of the switch, so as to realize the elimination of different loop gains.
- the power supply network provided in this application is used to provide a bias signal to the power amplifier, wherein the first filter circuit and the second filter circuit are used to eliminate loop gain, and the working state of the second filter circuit is controlled by the on and off of the switch , So that it forms a filter circuit with a different resonance frequency from the first filter circuit, so as to realize the elimination of different loop gains.
- Another object of the present application is to provide a signal processing system including the power supply network provided by the present application.
- Another purpose of this application is to provide an application of a power supply network including the switchable loop gain provided in this application in the radio frequency front end of a mobile phone.
- the power supply network provided by this application changes the state of the filter circuit working in the power supply network through the closed state or the open state of the switch, realizes different resonance frequencies, and can correspond to higher loop gains of circuits of different frequencies.
- the two frequency bands realize different loop gain characteristics, and the stability of the two frequency bands can be improved with one network.
- FIG. 1 is a circuit schematic diagram of a power amplifier composed of a conventional two-stage triode described in this application;
- FIG. 2 is one of the circuit schematic diagrams of the power supply network provided by this application.
- FIG. 3 is the second circuit schematic diagram of the power supply network provided by this application.
- Fig. 4 is a circuit schematic diagram of the signal processing system provided by this application.
- the first filter circuit The first filter circuit; 2. The second filter circuit; 3. Switch; 4. Power amplifier; 5. Impedance matching network; 6. Frequency selection switch; 7. Control chip; 8. Power supply network; 41. Intermediate frequency circuit; 42, low frequency circuit; 51, intermediate frequency impedance matching circuit; 52, low frequency impedance matching circuit.
- the power supply network with switchable loop gain provided by the present application includes a first filter circuit 1, a second filter circuit 2 and a switch 3.
- the first filter circuit 1 is always in working state
- the second filter circuit 2 is in a working state or a non-working state when the switch 3 is in a closed state or an open state, so that it forms a filter circuit with a different resonance frequency with the first filter circuit 1 so as to eliminate different loop gains.
- the power supply network with switchable loop gain provided in this application is a bias circuit used to provide bias current to the transistor in the power amplifier.
- it is applied to the mobile phone RF front end to provide bias current to the power amplifier in the mobile phone RF front end as an example to illustrate its working principle.
- the power amplifier of the mobile phone RF front end is usually used to process the low frequency and intermediate frequency bands, including the respective A low-frequency circuit for processing the low frequency band and an intermediate frequency circuit for processing the intermediate frequency band.
- the power supply network provided in this application is a schematic diagram of the connection circuit of the mobile phone radio frequency front-end power amplifier, as shown in Figures 4 and 5, where 4 represents the power amplifier, 41 represents the intermediate frequency circuit, 42 represents the low frequency circuit; the intermediate frequency circuit 41 and the low frequency circuit 42 Including two or more triodes.
- the power supply is loaded on the intermediate frequency circuit 41 and the low frequency circuit 42 after the first filter circuit 1 and/or the second filter circuit 2 to provide bias current for each stage of the transistor in the circuit; switch 3 Connect with the control chip in the radio frequency front end of the mobile phone.
- the control chip receives the frequency signal sent by the mobile phone baseband chip, and outputs a control signal to control the opening and closing of the switch 3 according to the frequency of the frequency signal. For example, when the frequency signal sent by the baseband chip is an intermediate frequency signal, the control chip outputs a control signal to control the switch 3 to be off.
- the first filter circuit 1 is in working state, and the second filter circuit 2 is not connected; at this time, the loop gain generated by the closed loop A in the intermediate frequency circuit 41 is eliminated by the resonant circuit formed by the first filter circuit 1, such as Shown in Figure 4.
- the control chip When the frequency signal sent by the baseband chip is a low-frequency signal, the control chip outputs a control signal to control the switch 3 to close, so that the second filter circuit 2 is connected, so that it and the first filter circuit 1 are in working state at the same time; at this time, the low-frequency circuit 42
- the loop gain generated by the closed loop B is eliminated by the resonant circuit formed by the first filter circuit 1 and the second filter circuit 2, as shown in FIG. 5.
- the initial state of the switch 3 may be closed or open. As shown in Figure 2, when the initial state of the switch 3 is closed, the first filter circuit 1 and the second filter circuit 2 are both in the working state; when the control signal controls the switch 3 to open, the second filter circuit 2 is disconnected , Only the first filter circuit 1 is in the working state, as shown in FIG. 3.
- the first filter circuit 1 and the second filter circuit 2 described in this application can use any filter circuit.
- the first filter circuit 1 is a capacitor C2 constituting a capacitor filter circuit
- the second filter circuit 2 is a capacitor formed by a capacitor C3.
- Filter circuit Of course, an inductance filter circuit, an LC filter circuit, etc. can also be used.
- the capacitor C2 and the capacitor C3 can be grounded separately or connected together and then grounded. Because the function of the capacitor C3 is to change the resonance frequency through its access. If the parasitic inductance is generated due to the grounding, just adjust the capacitance of C3, and the same effect can be achieved.
- the power supply network provided by this application realizes the access and disconnection of the second filter circuit 2 by controlling the closing and opening of the switch 3, and the access and disconnection of the second filter circuit 2 have two resonance frequencies, which are respectively determined by The first filter circuit 1 and the first filter circuit 1+the second filter circuit 2 are determined. These two resonance frequencies can correspond to the two frequency bands with relatively high loop gains in the low-frequency and intermediate-frequency circuits, and achieve the effect of increasing the stability of the low-frequency and intermediate-frequency circuits respectively.
- the switch 3 described here can adopt any kind of controllable switch.
- a MOS tube is used, and a signal is applied to the G pole of the MOS tube to control the closing and opening of the MOS tube.
- the power supply network provided in this application can be used for signal processing in any signal processing circuit.
- it is applied to the signal processing system of the radio frequency front end of a mobile phone.
- the signal processing system includes:
- Power amplifier 4 used for signal amplification
- the impedance matching network 5 is used to match the output impedance of the power amplifier 4 to the impedance of the load;
- the control chip 7 is used for receiving signals and outputting control signals according to the received signals to control the working state of the power amplifier 4, the frequency selection switch 6 and the switch 3 in the power supply network 8.
- the bias current provided by the power supply network 8 to the power amplifier 4, and the signal output by the power amplifier 4 is matched by the impedance matching network 5 and then output to the lower stage, such as an antenna, through the frequency selection switch 6.
- the power amplifier 4 includes an intermediate frequency circuit 41 for amplifying intermediate frequency signals and a low frequency circuit 42 for amplifying low frequency signals.
- the impedance matching network 5 includes an intermediate frequency impedance matching circuit 51 matched with the intermediate frequency circuit 41 and matched with the low frequency circuit 42.
- the low-frequency impedance matching circuit 52; the frequency selection switch 6 includes a switch S1 connected to the output terminal of the intermediate frequency impedance matching circuit 51 and a switch S2 connected to the output terminal of the low-frequency impedance matching circuit 52.
- the intermediate frequency circuit 41 and the low frequency circuit 42 described herein can adopt any amplifying circuit, for example, a three-stage series common emitter transistor is used to form an intermediate frequency circuit for amplifying intermediate frequency signals and a low frequency circuit for amplifying low frequency signals.
- the specific circuit structure is shown in Figure 7, including a first-stage transistor Q3, a second-stage transistor Q4, and a third-stage transistor Q5.
- the collector of the first-stage transistor Q3 is connected to the base of the second-stage transistor Q4 via a capacitor C4.
- the collector of the second-stage transistor Q4 is connected to the base of the third-stage transistor Q5 via the capacitor C5.
- the base of the first-stage transistor Q3 is used as an input terminal for inputting frequency signals
- the collector of the third-stage transistor Q5 is used as an output terminal for outputting signals processed by the three-stage transistor.
- the emitter of the first-stage transistor Q3, the emitter of the second-stage transistor Q4, and the emitter of the third-stage transistor Q5 are grounded respectively; the collector of the first-stage transistor Q3, the collector of the second-stage transistor Q4, and the third-stage The collectors of the transistor Q5 are respectively connected to the power supply VCC via the LC circuit.
- the bias current provided by the power supply network provided in this application is respectively loaded on the base of the first-stage transistor Q3, the base of the second-stage transistor Q4, and the base of the third-stage transistor Q5 to ensure that the first-stage transistor Q3 and the The normal operation of the second-stage transistor Q4 and the third-stage transistor Q5.
- the low-frequency (intermediate frequency) circuit provided in Figure 7 of this article is a typical circuit, and of course there can be different low-frequency circuits and intermediate frequency circuits.
- the intermediate frequency impedance matching circuit 51 and the low frequency impedance matching circuit 52 recorded in this document can adopt any impedance matching circuit.
- the intermediate frequency impedance matching circuit 51 provided here includes an inductor L1, an inductor L2, a capacitor C5, and a capacitor C6, one end of the inductor L1
- the input end of the intermediate frequency impedance matching circuit 51 is connected to the output end of the intermediate frequency circuit 41, and the other end is connected to one end of the inductor L2 and grounded through the capacitor C5; the other end of the inductor L2 is used as the output end of the intermediate frequency impedance matching circuit 51 to connect to the switch S1 and the inductor L2 The other end is also grounded via capacitor C6.
- the low-frequency impedance matching circuit 52 includes an inductor L3, an inductor L4, a capacitor C7, and a capacitor C8.
- One end of the inductor L3 is used as the input end of the low-frequency impedance matching circuit 52 to connect to the output end of the low-frequency circuit 42, and the other end is connected to the inductor L4.
- One end is grounded through the capacitor C7; the other end of the inductor L4 is used as the output terminal of the low-frequency impedance matching circuit 52 to connect to the switch S2, and the other end of the inductor L4 is also grounded through the capacitor C8.
- the control chip 7 can use any chip that can store a computer program and run the stored in it when power is supplied.
- the function implemented by the program is: accepting the signal sent by the mobile phone baseband chip and outputting control instructions according to the received signal Control the working state of the power amplifier 4, the frequency selection switch 6 and the switch 3 in the power supply network 8.
- control chip 7 When the signal processing system provided in this application is applied to the mobile phone radio frequency front-end processing signal, when the control chip 7 receives the instruction issued by the mobile phone baseband chip, it will generate corresponding control signals to control other chips, such as power amplifiers, frequency selection switches, etc. . In addition, the control chip 7 also generates a separate signal to control the switch 3. When the baseband sends a low-frequency working signal to the control chip 7, the control chip 7 will generate a signal to close the switch 3 and connect the second filter circuit 2 to the power supply network. When the baseband sends an intermediate frequency operation signal to the control chip 7, the control chip 7 will generate a signal to turn off the switch 3 and not connect the second filter circuit 2 to the power supply network.
- control principle of the control chip 7 is based on the control principle of the signal processing system provided in this application when applied to the radio frequency front end of a mobile phone.
- the basic principle is the same, and the difference is that the control signal received by the control chip 7 is different.
- low frequencies are generally below 1.0 GHz; frequencies above 1.0 GHz and below 2.025 GHz (that is, Band34) are intermediate frequencies.
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Abstract
Description
Claims (18)
- 一种可切换环路增益的供电网络,其特征在于:该供电网络用于向功率放大器提供偏置信号,包括第一滤波电路(1)、第二滤波电路(2)和开关(3),所述第一滤波电路(1)一直处于工作状态,所述第二滤波电路(2)经所述开关(3)闭合状态或断开状态,使其与所述第一滤波电路(1)构成谐振频率不同的滤波电路,从而实现对不同的环路增益进行消除。
- 根据权利要求1所述的可切换环路增益的供电网络,其特征在于:所述第一滤波电路(1)和所述第二滤波电路(2)接地。
- 根据权利要求1所述的可切换环路增益的供电网络,其特征在于:所述第一滤波电路(1)包括电容滤波电路或电感滤波电路或LC滤波电路。
- 根据权利要求1所述的可切换环路增益的供电网络,其特征在于:所述第二滤波电路(2)包括电容滤波电路或电感滤波电路或LC滤波电路。
- 根据权利要求1所述的可切换环路增益的供电网络,其特征在于:所述开关(3)在低频时闭合,所述第一滤波电路(1)和所述第二滤波电路(2)处于工作状态;所述开关(3)在中频时断开,所述第一滤波电路(1)处于工作状态。
- 一种信号处理系统,其特征在于:该系统包括供电网络,所述供电网络用于向功率放大器提供偏置信号,包括第一滤波电路(1)、 第二滤波电路(2)和开关(3),所述第一滤波电路(1)一直处于工作状态,所述第二滤波电路(2)经所述开关(3)闭合状态或断开状态,使其与所述第一滤波电路(1)构成谐振频率不同的滤波电路,从而实现对不同的环路增益进行消除。
- 根据权利要求6所述的信号处理系统,其特征在于,还包括:功率放大器(4),用于信号放大;阻抗匹配网络(5),用于将所述功率放大器(4)的输出阻抗匹配到负载的阻抗;频率选择开关(6),以及控制芯片(7),用于接受信号,并根据接受到的信号输出控制信号,控制所述功率放大器(4)、所述频率选择开关(6)和所述供电网络中的开关(3)的工作状态。
- 根据权利要求7所述的信号处理系统,其特征在于:所述功率放大器(4)包括中频电路和低频电路,所述阻抗匹配网络(5)包括与所述中频电路相匹配的中频阻抗匹配电路和与所述低频电路相匹配的低频阻抗匹配电路;所述频率选择开关(6)包括与所述中频阻抗匹配电路输出端连接的开关S1和与所述低频阻抗匹配电路输出端连接的开关S2;当基带发出低频工作的信号给控制芯片(7)时,控制芯片7信号控制开关(3)闭合,把第二滤波电路(2)接入供电网络,当基带发出中频工作的信号给控制芯片(7)时,控制芯片(7)信号控制开关(3)断开,第二滤波电路(2)不接入供电网络,保证功率放大器 (4)在不同的频段达到稳定。
- 根据权利要求8所述的信号处理系统,其特征在于:所述中频电路和/或所述低频电路为一个三级串联的共射极放大电路。
- 如权利要求6所述的信号处理系统,其特征在于,所述第一滤波电路(1)和所述第二滤波电路(2)接地。
- 如权利要求6所述的信号处理系统,其特征在于,所述第一滤波电路(1)包括电容滤波电路或电感滤波电路或LC滤波电路。
- 如权利要求6所述的信号处理系统,其特征在于,所述第二滤波电路(2)包括电容滤波电路或电感滤波电路或LC滤波电路。
- 如权利要求6所述的信号处理系统,其特征在于,所述开关(3)在低频时闭合,所述第一滤波电路(1)和所述第二滤波电路(2)处于工作状态;所述开关(3)在中频时断开,所述第一滤波电路(1)处于工作状态。
- 一种可切换环路增益的供电网络在手机射频前端的应用,所述供电网络用于向功率放大器提供偏置信号,包括第一滤波电路(1)、第二滤波电路(2)和开关(3),所述第一滤波电路(1)一直处于工作状态,所述第二滤波电路(2)经所述开关(3)闭合状态或断开状态,使其与所述第一滤波电路(1)构成谐振频率不同的滤波电路,从而实现对不同的环路增益进行消除。
- 如权利要求14所述的可切换环路增益的供电网络在手机射频前端的应用,其特征在于,所述第一滤波电路(1)和所述第二滤 波电路(2)接地。
- 如权利要求14所述的可切换环路增益的供电网络在手机射频前端的应用,其特征在于,所述第一滤波电路(1)包括电容滤波电路或电感滤波电路或LC滤波电路。
- 如权利要求14所述的可切换环路增益的供电网络在手机射频前端的应用,其特征在于,所述第二滤波电路(2)包括电容滤波电路或电感滤波电路或LC滤波电路。
- 如权利要求14所述的可切换环路增益的供电网络在手机射频前端的应用,其特征在于,所述开关(3)在低频时闭合,所述第一滤波电路(1)和所述第二滤波电路(2)处于工作状态;所述开关(3)在中频时断开,所述第一滤波电路(1)处于工作状态。
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WO2019174805A1 (en) * | 2018-03-15 | 2019-09-19 | RF360 Europe GmbH | Gain control filter circuit, power module comprising a filter circuit and method of adjusting an rf filter circuit to provide a controllable gain |
CN111030079A (zh) * | 2020-03-06 | 2020-04-17 | 锐石创芯(深圳)科技有限公司 | 一种可切换环路增益的供电网络、信号处理系统及应用 |
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