Radio frequency amplifier

Abstract

The embodiment of the invention provides a radio frequency amplifier which comprises an amplifying unit, and the amplifying unit comprises a first amplifying tube, a second amplifying tube, a first inductor and a second inductor. The control end of the first amplifier tube is coupled to the radio frequency input end, the first end of the first amplifier tube is coupled to the grounding end, and the second end of the first amplifier tube is connected with the first end of the second amplifier tube; the control end of the second amplifier tube is coupled to the first bias voltage end, and the second end of the second amplifier tube is coupled to the radio frequency output end; wherein the first inductor is connected in series between the control end of the first amplifier tube and the radio frequency input end, and the second inductor is connected in series between the first end of the first amplifier tube and the grounding end; and the first inductor and the second inductor are close to each other, so that magnetic field coupling exists between the first inductor and the second inductor. Therefore, the inductors are added in the radio-frequency amplifier circuit, and the gain of the amplifier tube in the amplification unit is improved through magnetic field coupling between the inductors, so that the gain of the radio-frequency amplifier is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of semiconductor technology, and in particular to a radio frequency amplifier. BACKGROUND

[0002] A radio frequency amplifier (RF amplifier) is a key component in high-frequency electronic devices such as wireless communication, radar, satellite systems, etc. Its main function is to amplify the input radio frequency signal power to the required level while maintaining the integrity and linearity of the signal as much as possible. In a radio frequency system, the performance of the amplifier directly affects the transmission quality of the signal, the sensitivity of the system, and the overall efficiency, so its design and optimization are of great significance.

[0003] With the rapid development of 5G, Internet of Things (IoT), and millimeter wave technology, radio frequency amplifiers need to achieve high gain and low distortion under the conditions of higher frequency, wider bandwidth, and lower power consumption, which puts higher requirements on semiconductor processes (such as GaAs, GaN, SiGe) and circuit design techniques (such as feedback structure, matching network). Therefore, gain optimization and efficiency improvement have always been the focus of radio frequency amplifier research.

[0004] Current radio frequency amplifiers need to meet the requirements of wideband, high gain, high power, and high efficiency. Common amplifier structures such as common-source common-gate structures require a source series inductance to ground for better input matching bandwidth, but this inductance to ground often limits the gain of the amplifier. SUMMARY

[0005] To solve the problem that the gain of the radio frequency amplifier is limited, the embodiments of the present application provide a radio frequency amplifier. An inductance is added to the radio frequency amplifier circuit, and the gain of the amplifying tube in the amplifying unit is improved through the magnetic field coupling between the inductances, thereby improving the gain of the radio frequency amplifier.

[0006] The technical scheme of the embodiments of the present application is implemented as follows:

[0007] In a first aspect, the embodiments of the present application provide a radio frequency amplifier, characterized in that the radio frequency amplifier comprises an amplifying unit, and the amplifying unit comprises a first amplifying tube, a second amplifying tube, a first inductance, and a second inductance.

[0008] The control end of the first amplifying tube is coupled to a radio frequency input end, the first end of the first amplifying tube is coupled to a ground end, and the second end of the first amplifying tube is connected to the first end of the second amplifying tube. The control end of the second amplifying tube is coupled to a first bias voltage end, and the second end of the second amplifying tube is coupled to a radio frequency output end.

[0009] The first inductor is connected in series between the control end of the first amplifier tube and the RF input end, and the second inductor is connected in series between the first end of the first amplifier tube and the ground end. The first inductor and the second inductor are located close to each other, so that magnetic field coupling exists between the first inductor and the second inductor.

[0010] In some embodiments, a third inductor is connected in series between the control terminal of the second amplifier tube and the first bias voltage terminal;

[0011] The third inductor is located close to the first inductor, so that magnetic field coupling exists between the first inductor and the third inductor.

[0012] In some embodiments, the winding directions of the first inductor and the second inductor are opposite;

[0013] The first inductor and the third inductor have the same winding direction.

[0014] In some embodiments, the number of the amplifying units is 2, and the first amplifying unit and the second amplifying unit share the same first inductor;

[0015] The RF amplifier further includes a fourth inductor. The fourth inductor and the first inductor are combined to form a transformer. A first end of the fourth inductor is coupled to the ground end, and a second end of the fourth inductor is coupled to the RF input end.

[0016] In some embodiments, the fourth inductor and the first inductor have the same winding direction;

[0017] The second inductor of the first amplifying unit and the second inductor of the second amplifying unit have the same winding direction.

[0018] In some embodiments, the second inductor and the first inductor of the second amplifying unit are located close to each other, so that magnetic field coupling exists between the second inductor and the first inductor.

[0019] In some embodiments, the control end of the second amplifier tube of the first amplifier unit and the control end of the second amplifier tube of the second amplifier unit are coupled to the same first bias voltage end, and a first resistor is connected in series between the control end of each second amplifier tube and the first bias voltage end.

[0020] In some embodiments, the amplifying unit further includes a fifth inductor and a second resistor;

[0021] A first end of the fifth inductor of the first amplification unit is coupled to a control end of the second amplifying tube of the first amplification unit, a second end of the fifth inductor of the second amplification unit is coupled to a control end of the second amplifying tube of the second amplification unit, and a second end of the fifth inductor of the first amplification unit is coupled to a first end of the fifth inductor of the second amplification unit.

[0022] A first end of the second resistor is coupled to a second end of the fifth inductor of the first amplification unit and a first end of the fifth inductor of the second amplification unit, and a second end of the second resistor is coupled to the second bias voltage end.

[0023] In some embodiments, the fifth inductor and the first inductor have the same winding direction.

[0024] The fifth inductor of the first amplification unit and the fifth inductor of the second amplification unit have the same winding direction.

[0025] The fifth inductor and the first inductor are located close to each other, and there is a magnetic field coupling between the first inductor and the fifth inductor.

[0026] In some embodiments, the amplification unit further comprises a third resistor.

[0027] A first end of the third resistor is coupled to the third bias voltage end, and a second end of the third resistor is coupled to the control end of the first inductor and the first amplifying tube.

[0028] In some embodiments, the radio frequency amplifier further comprises a sixth inductor.

[0029] A first end of the sixth inductor is coupled to a first end of the direct current source, and a second end of the sixth inductor is coupled to a second end of the second amplifying tube and the radio frequency output end.

[0030] A second end of the direct current source is coupled to the ground end.

[0031] In a second aspect, the embodiments of the present application provide an electronic device, which at least comprises the radio frequency amplifier of the first aspect.

[0032] The embodiment of the present application provides a radio frequency amplifier, which comprises an amplification unit, the amplification unit comprising a first amplifying tube, a second amplifying tube, a first inductor and a second inductor; a control end of the first amplifying tube is coupled to a radio frequency input end, a first end of the first amplifying tube is coupled to a ground end, and a second end of the first amplifying tube is connected with a first end of the second amplifying tube; a control end of the second amplifying tube is coupled to a first bias voltage end, and a second end of the second amplifying tube is coupled to a radio frequency output end; wherein the first inductor is connected in series between the control end of the first amplifying tube and the radio frequency input end, and the second inductor is connected in series between the first end of the first amplifying tube and the ground end; the first inductor and the second inductor are close to each other, so that there is a magnetic field coupling between the first inductor and the second inductor. In this way, the inductors are added in the radio frequency amplifier circuit, the gain of the amplifying tube in the amplification unit is improved through the magnetic field coupling between the inductors, and therefore the gain of the radio frequency amplifier is improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 A structure schematic diagram of a radio frequency amplifier (common source common gate) provided in the related art;

[0034] Figure 2 A first partial structure schematic diagram of a radio frequency amplifier provided in the embodiment of the present application;

[0035] Figure 3 A second partial structure schematic diagram of a radio frequency amplifier provided in the embodiment of the present application;

[0036] Figure 4 A third partial structure schematic diagram of a radio frequency amplifier provided in the embodiment of the present application;

[0037] Figure 5 A fourth partial structure schematic diagram of a radio frequency amplifier provided in the embodiment of the present application;

[0038] Figure 6 A fifth partial structure schematic diagram of a radio frequency amplifier provided in the embodiment of the present application;

[0039] Figure 7 A sixth partial structure schematic diagram of a radio frequency amplifier provided in the embodiment of the present application;

[0040] Figure 8 A seventh partial structure schematic diagram of a radio frequency amplifier provided in the embodiment of the present application;

[0041] Figure 9 A structure schematic diagram of a radio frequency amplifier provided in the embodiment of the present application;

[0042] Figure 10 A structure schematic diagram of another radio frequency amplifier provided in the embodiment of the present application;

[0043] Figure 11 FIG. 1 shows a structural schematic diagram of a radio frequency amplifier according to an embodiment of the present disclosure;

[0044] Figure 12 FIG. 4 shows a structural schematic diagram of an electronic device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present disclosure will be clearly and completely described with reference to the drawings in the embodiments of the present disclosure. It can be understood that the specific embodiments described herein are only used to explain the related application, and not to limit the application. In addition, it should be noted that, for the convenience of description, only the parts related to the application are shown in the drawings. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as understood by those skilled in the art to which the present disclosure belongs. The terms used herein are only for the purpose of describing the embodiments of the present disclosure and are not intended to limit the present disclosure. In the following description, "some embodiments" are described, which describe a subset of all possible embodiments, but it can be understood that "some embodiments" can be the same subset or different subset of all possible embodiments, and can be combined with each other without conflict. It should be noted that the terms "first", "second", "third" related to the embodiments of the present disclosure are only used to distinguish similar objects, and can be understood that "first", "second", "third" can be interchanged in a specific order or sequence as allowed, so that the embodiments of the present disclosure described herein can be implemented in an order other than that illustrated or described.

[0046] In an embodiment of the related art, the radio frequency amplifier can be realized in a common source and common gate manner, please refer to Figure 1 , which shows a structural schematic diagram of a radio frequency amplifier (common source and common gate) provided by the related art. Please refer to Figure 1 , the common source and common gate radio frequency amplifier includes an amplifying tube M1, an amplifying tube M2, an inductor Lg, an inductor Ls, a resistor R1, a resistor R2 and an inductor Lch, the control end of the amplifying tube M1 is connected to the radio frequency input end, the first end of the amplifying tube M1 is connected to the ground end, and the second end of the amplifying tube M1 is connected to the first end of the amplifying tube M2; the control end of the amplifying tube M2 is connected to the bias voltage end Vg2, and the second end of the amplifying tube M2 is connected to the radio frequency output end; the inductor Lg is connected in series between the control end of the amplifying tube M1 and the radio frequency input end, and the inductor Ls is connected in series between the first end of the amplifying tube M1 and the ground end; the resistor R2 is connected in series between the bias voltage end Vg2 and the control end of the amplifying tube M2; one end of the resistor R1 is connected to the bias voltage end Vg1, and the other end is connected to the inductor Lg and the control end of the amplifying tube M1; one end of the inductor Lch is connected to a direct current source, and the other end is connected to the second end of the amplifying tube M2 and the radio frequency output end; the other end of the direct current source is connected to the ground end.

[0047] It should be noted that the control end of the amplifying tube M1 and the amplifying tube M2 refers to the gate, the first end of the amplifying tube M1 and the amplifying tube M2 refers to the source, and the second end of the amplifying tube M1 and the amplifying tube M2 refers to the drain.

[0048] Here, in order to better input match broadband, it is necessary to connect an inductor in series between the source and the ground, i.e., the inductor Ls. The source-to-ground inductor (the inductor Ls) introduces frequency-dependent negative feedback. The higher the frequency, the greater the impedance presented by the inductor, and the stronger the negative feedback. The source-to-ground inductor (the inductor Ls) reduces the effectiveness of the transconductance, especially at high frequencies. The negative feedback significantly weakens the gain, and thus the source-to-ground inductor (the inductor Ls) often limits the gain of the radio frequency amplifier.

[0049] Based on this, the embodiment of the present disclosure provides a radio frequency amplifier. The radio frequency amplifier comprises an amplifying unit, and the amplifying unit comprises a first amplifying tube, a second amplifying tube, a first inductor and a second inductor. The control end of the first amplifying tube is coupled to a radio frequency input end, the first end of the first amplifying tube is coupled to a ground end, and the second end of the first amplifying tube is connected to the first end of the second amplifying tube. The control end of the second amplifying tube is coupled to a first bias voltage end, and the second end of the second amplifying tube is coupled to a radio frequency output end. The first inductor is connected in series between the control end of the first amplifying tube and the radio frequency input end, and the second inductor is connected in series between the first end of the first amplifying tube and the ground end. The first inductor and the second inductor are located close to each other, so that there is a magnetic field coupling between the first inductor and the second inductor.

[0050] Here, the magnetic field coupling between the first inductor and the second inductor in the amplifying unit increases the equivalent radio frequency swing of the bias voltage end, thereby improving the gain of the radio frequency amplifier.

[0051] In the following, the radio frequency amplifier in the embodiment of the present disclosure is described in detail in combination with the drawings.

[0052] In some embodiments of the present disclosure, please refer to Figure 2 which shows a first partial structure schematic diagram of a radio frequency amplifier 10 provided by the embodiment of the present disclosure. As shown in Figure 2As shown, the radio frequency amplifier 10 comprises an amplification unit 100, the amplification unit 100 comprising a first amplifying tube 101, a second amplifying tube 102, a first inductor 103 and a second inductor 104; a control end of the first amplifying tube 101 is coupled to a radio frequency input end, a first end of the first amplifying tube 101 is coupled to a ground end, and a second end of the first amplifying tube 101 is connected to a first end of the second amplifying tube 102; a control end of the second amplifying tube 102 is coupled to a first bias voltage end, and a second end of the second amplifying tube 102 is coupled to a radio frequency output end; wherein the first inductor 103 is connected in series between the control end of the first amplifying tube 101 and the radio frequency input end, and the second inductor 104 is connected in series between the first end of the first amplifying tube 101 and the ground end; the first inductor 103 and the second inductor 104 are close to each other, so that there is a magnetic field coupling between the first inductor 103 and the second inductor 104.

[0053] In this embodiment, in order to improve the gain of the amplifying tube, the first inductor 103 is connected in series at the control end of the first amplifying tube 101, and the second inductor 104 is coupled with the first inductor 103, so that the control end driving signal of the first amplifying tube 101 is opposite to the first end driving signal of the first amplifying tube 101, and the radio frequency swing and gain of the overall circuit are optimized through the inverting amplification characteristic of the first amplifying tube 101.

[0054] Specifically, the second inductor 104 is connected in series at the first end of the first amplifying tube 101, the winding directions of the coils between the first inductor 103 and the second inductor 104 are opposite, the control end voltage induced by the first inductor 103 is opposite to the first end voltage induced by the second inductor 104, the radio frequency signal voltages induced by them are 180° out of phase, the effective radio frequency voltage amplitude between the control end and the first end of the first amplifying tube 101 is doubled, and the equivalent radio frequency swing is directly increased. The second inductor 104 introduces negative feedback, which reduces the gain, but the voltage drop of the second inductor 104 is offset by the induced voltage of the first inductor 103, the negative feedback is neutralized, and the gain of the first amplifying tube 101 is improved.

[0055] In some embodiments of the present disclosure, please refer to Figure 3 which shows a second partial structure diagram of the radio frequency amplifier 10 provided by the embodiments of the present disclosure. As shown in Figure 3 , the control end of the second amplifying tube 102 is connected in series with the third inductor 105 between the first bias voltage end; wherein the third inductor 105 is close to the first inductor 103, so that there is a magnetic field coupling between the first inductor 103 and the third inductor 105.

[0056] In this embodiment, in order to improve the gain of the amplifying tube, the third inductor 105 is connected in series with the control end of the second amplifying tube 102, and the control end drive signal of the second amplifying tube 102 is in phase with the control end drive signal of the first amplifying tube 101 through the coupling effect of the third inductor 105 and the first inductor 103, and the RF swing and gain of the overall circuit are optimized by using the inverting amplification characteristic of the first amplifying tube 101.

[0057] Specifically, the control end voltage of the first amplifying tube 101 is in phase with the control end voltage of the second amplifying tube 102 by making the winding directions of the coils between the third inductor 105 and the first inductor 103 in the same direction, thereby ensuring that the control end drive signal of the second amplifying tube 102 is synchronized with the first amplifying tube 101, avoiding phase cancellation, and the second end voltage of the first amplifying tube 101 is inverted after being amplified by the first amplifying tube 101, so that the equivalent RF swing of the first bias voltage end is increased, and the gain of the second amplifying tube 102 is improved.

[0058] In some embodiments of the present disclosure, please refer to Figure 4 which shows a third partial structure diagram of a RF amplifier 10 provided by an embodiment of the present disclosure. As shown in Figure 4 , the number of amplifying units 100 is 2, and the first amplifying unit 100-1 and the second amplifying unit 100-2 share the same first inductor 103; the RF amplifier further comprises a fourth inductor 106, and the fourth inductor 106 and the first inductor 103 form a transformer 200, the first end of the fourth inductor 106 is coupled to the ground end, and the second end of the fourth inductor 106 is coupled to the RF input end.

[0059] In this embodiment, in order to improve the gain of the amplifying tube, an amplifying unit 100 is added, and the control ends of the first amplifying tube 101-1 and the first amplifying tube 101-2 are connected to the same inductor, i.e. the first inductor 103, and a fourth inductor 106 is added, so that the fourth inductor 106 and the first inductor 103 form a transformer 200 together, and the control end drive signal of the first amplifying tube 101-1 is inverted with the control end drive signal of the first amplifying tube 101-2 through the coupling effect of the transformer 200 and the second inductor 104 and the first inductor 103 in the amplifying unit 100, and the first end drive signal of the first amplifying tube 101-1 is in phase with the first end drive signal of the first amplifying tube 101-2, thereby optimizing the RF swing and gain of the overall circuit.

[0060] It should be noted that the first inductor 103 and the fourth inductor 106 forming the transformer 200 are magnetically coupled with each other; the first amplifying tube 101-1 and the first amplifying tube 101-2 form a pair of differential pair tubes; and the second amplifying tube 102-1 and the second amplifying tube 102-2 form a differential amplifying tube.

[0061] Specifically, when a signal is input into the radio frequency input end, the input signal is converted into a pair of differential signals through the input balun. At this time, the winding direction of the fourth inductor 106 is the same as that of the first inductor 103, the winding direction of the first inductor 103 is opposite to that of the second inductor 104-1 and the second inductor 104-2, the control end voltage induced by the first inductor 103 is opposite to the first end voltage induced by the second inductor 104-1, and the control end voltage induced by the first inductor 103 is opposite to the first end voltage induced by the second inductor 104-2. Therefore, the effective radio frequency voltage amplitude between the control end and the first end of the first amplifying tube 101-1 is doubled, the effective radio frequency voltage amplitude between the control end and the first end of the first amplifying tube 101-2 is doubled, the equivalent radio frequency swing is directly increased, and the gain of the first amplifying tube 101-1 and the first amplifying tube 101-2 is improved.

[0062] It should be noted that the first amplifying tube 101-1 refers to the first amplifying tube of the first amplifying unit, the first amplifying tube 101-2 refers to the first amplifying tube 101-2 of the second amplifying unit, the second amplifying tube 102-1 refers to the second amplifying tube 102-1 of the first amplifying unit, the second amplifying tube 102-2 refers to the second amplifying tube 102-2 of the second amplifying unit, the second inductor 104-1 refers to the second inductor 104-1 of the first amplifying unit, and the second inductor 104-2 refers to the second inductor 104-2 of the second amplifying unit.

[0063] Here, the first inductor 103 in the transformer is connected to the control end of the first amplifying tube 101-1 and the control end of the first amplifying tube 101-2, converts the input radio frequency signal of the fourth inductor 106 in the transformer into a symmetrical differential signal, thereby controlling the conduction state of the first amplifying tube 101-1 and the first amplifying tube 101-2, and realizing signal amplification. This structure utilizes the wideband characteristics of the transformer 200 to realize impedance matching, and enhances the voltage swing of the signal through magnetic field coupling, thereby improving the transconductance and voltage gain of the amplifier.

[0064] In some embodiments of the present disclosure, please refer to Figure 5 , which shows a fourth partial structure schematic diagram of a radio frequency amplifier 10 provided by an embodiment of the present disclosure. As shown in Figure 5 , the control end of the second amplifying tube 102-1 and the control end of the second amplifying tube 102-2 are coupled to the same first bias voltage end, and a first resistor 107 is connected in series between the control end of each second amplifying tube and the first bias voltage end.

[0065] Here, the second amplification tube 102-1 and the first resistor 107-1, and the second amplification tube 102-2 and the first resistor 107-2 respectively constitute active bias networks, the current of the second amplification tube 102-1 and the second amplification tube 102-2 is set through the bias voltage and the resistor, and the static working points of the first amplification tube 101-1 and the first amplification tube 101-2 are matched to avoid gain fluctuation caused by process deviation or temperature change. The first resistor 107 is used to limit the bias current and improve the linearity of the circuit (i.e. the degree of distortion of the circuit when amplifying signals), and the control ends of the second amplification tube 102-1 and the second amplification tube 102-2 are usually controlled by common-mode feedback or fixed bias voltage, which ensures that the static working points of the differential tubes (the first amplification tube 101-1 and the first amplification tube 101-2) are matched, and reduces the influence of common-mode noise.

[0066] It should be noted that the first resistor 107-1 refers to the first resistor of the first amplification unit, and the first resistor 107-2 refers to the first resistor of the second amplification unit.

[0067] In some embodiments of the present disclosure, please refer to Figure 6 , which shows a fifth partial structure schematic diagram of a radio frequency amplifier 10 provided by an embodiment of the present disclosure. As shown in Figure 6 , the amplification unit 100 further comprises a fifth inductor 108 and a second resistor 109; the first end of the fifth inductor 108-1 is coupled to the control end of the second amplification tube 102-1, the second end of the fifth inductor 108-2 is coupled to the control end of the second amplification tube 102-2, the second end of the fifth inductor 108-1 is coupled to the first end of the fifth inductor 108-2; the first end of the second resistor 109 is coupled to the second end of the fifth inductor 108-1 and the first end of the fifth inductor 108-2, and the second end of the second resistor 109 is coupled to the second bias voltage end.

[0068] It should be noted that the fifth inductor 108-1 refers to the fifth inductor of the first amplification unit, and the fifth inductor 108-2 refers to the fifth inductor of the second amplification unit.

[0069] Here, the fifth inductor 108 and the first inductor 103 have the same winding direction, the fifth inductor 108-1 and the fifth inductor 108-2 have the same winding direction; the second amplifier tube 102-1 has the same phase as the control end signal of the first amplifier tube 101-1, and the second amplifier tube 102-2 has the same phase as the control end signal of the first amplifier tube 101-2; the control end signal of the second amplifier tube 102-1 is opposite to the first end signal, and the control end signal of the second amplifier tube 102-2 is opposite to the first end signal. Therefore, the effective RF voltage amplitude between the control end and the first end of the second amplifier tube 102-1 is doubled, the effective RF voltage amplitude between the control end and the first end of the second amplifier tube 102-2 is doubled, the equivalent RF swing is directly increased, and the gain of the second amplifier tube 102-1 and the second amplifier tube 102-2 is improved.

[0070] The second resistor 109 limits the DC current flowing from the second bias voltage end to the control end of the second amplifier tube, so as to avoid that the excessive bias current causes damage to the amplifier tube device; the second resistor 109 cooperates with the fifth inductor 108 to prevent the RF signal from entering the bias circuit and reduce the interference of the bias end on the RF signal.

[0071] Further, the fifth inductor 108-1 and the fifth inductor 108-2 are connected in series and present high impedance to the RF signal, so as to prevent the RF signal from leaking to the second bias voltage end; the symmetrically designed fifth inductor 108-1 and the fifth inductor 108-2 ensure the balance of the signal path and suppress common-mode noise; the second bias voltage is provided through the connection point of the second resistor 109 and the series-connected fifth inductor 108, so as to provide stable DC bias for the control end of the second amplifier tube 102-1 and the second amplifier tube 102-2 and ensure that the amplifier tube works at a suitable static operating point.

[0072] In some embodiments of the present disclosure, please refer to Figure 7 , which shows a sixth partial structure schematic diagram of the RF amplifier 10 provided by the embodiments of the present disclosure. As shown in Figure 7 , the amplification unit 100 further includes a third resistor 110; the first end of the third resistor 110 is coupled to a third bias voltage end, and the second end of the third resistor 110 is coupled to the control end of the first inductor 103 and the first amplifier tube 101.

[0073] Here, the third resistor 110 establishes a stable static operating point for the control end of the first amplifier tube 101-1 and the first amplifier tube 101-2, ensures that the amplifier tube works in the saturation region, and provides a basis for the amplifier tube to achieve high transconductance and high gain.

[0074] In some embodiments of the present disclosure, please refer to Figure 8 , which shows a seventh partial structure schematic diagram of the RF amplifier 10 provided by the embodiments of the present disclosure. As shown in Figure 8As shown, the radio frequency amplifier 10 further comprises a sixth inductor 111; a first end of the sixth inductor 111 is coupled to a first end of a direct current source, and a second end of the sixth inductor 111 is coupled to a second end of the second amplifying tube 102 and a radio frequency output end; a second end of the direct current source is coupled to a ground end.

[0075] It should be noted that the sixth inductor 111 is a choke inductor, which presents a low impedance path for a direct current signal in the differential radio frequency amplification circuit, provides a stable direct current working voltage for the drain of the amplifying tube, presents a high impedance for a radio frequency signal, forms an effective radio frequency choke, prevents the amplified radio frequency signal from leaking to the power supply network, and ensures that the signal energy is effectively transmitted to the radio frequency output end.

[0076] Here, the second end of the second amplifying tube 102-1 and the second amplifying tube 102-2 is connected to the positive electrode of the direct current source through the sixth inductor 111, the sixth inductor 111 presents a low impedance for a direct current, provides a stable direct current working voltage for the second amplifying tube 102-1 or the second amplifying tube 102-2, and presents a high impedance for a radio frequency signal, prevents radio frequency energy from leaking to the power supply end, and ensures that the amplified radio frequency signal can be effectively transmitted to the radio frequency output end.

[0077] In summary, the present disclosure provides a radio frequency amplifier, in a specific example, please refer to Figure 9 which shows a structure schematic diagram of a radio frequency amplifier 10 provided by an embodiment of the present disclosure. As shown in Figure 9 , the radio frequency amplifier 10 comprises an amplification unit 100, the amplification unit 100 comprises a first amplifying tube 101, a second amplifying tube 102, a first inductor 103 and a second inductor 104; a control end of the first amplifying tube 101 is coupled to a radio frequency input end, a first end of the first amplifying tube 101 is coupled to a ground end, and a second end of the first amplifying tube 101 is connected to a first end of the second amplifying tube 102; a control end of the second amplifying tube 102 is coupled to a first bias voltage end, and a second end of the second amplifying tube 102 is coupled to a radio frequency output end; wherein the control end of the first amplifying tube 101 and the radio frequency input end are connected in series through the first inductor 103, the first end of the first amplifying tube 101 and the ground end are connected in series through the second inductor 104; the first inductor 103 and the second inductor 104 are close to each other, so that there is a magnetic field coupling between the first inductor 103 and the second inductor 104.

[0078] It should be noted that the control end of the amplifying tube in the amplification unit refers to the gate, the first end of the amplifying tube refers to the source, and the second end of the amplifying tube refers to the drain.

[0079] Compared with the traditional common-source common-gate radio frequency amplifier, the radio frequency amplifier 10 provided by the embodiment adopts the mode of magnetic field coupling between the first inductor 103 and the second inductor 104 to improve the gain of the radio frequency amplifier 10. In the radio frequency amplifier 10, the winding directions of the coils between the first inductor 103 and the second inductor 104 are opposite, the gate voltage induced by the first inductor 103 is opposite to the source voltage induced by the second inductor 104, the phase of the radio frequency signal voltages induced by them is opposite by 180°, the effective radio frequency voltage amplitude between the gate and the source of the first amplifying tube 101 is doubled, and the gate-source voltage equivalent radio frequency swing of the first amplifying tube 101 is directly increased. The second inductor 104 introduces negative feedback, which reduces the gain, however, the voltage drop of the second inductor 104 is offset by the induced voltage of the first inductor 103 in the radio frequency amplifier 10, the negative feedback is neutralized, and the gain of the first amplifying tube 101 is improved.

[0080] In some embodiments, please continue to refer to Figure 9 , the control end of the second amplifying tube 102 is connected in series with the first bias voltage end through the third inductor 105; wherein the third inductor 105 is close to the first inductor 103, so that the magnetic field coupling exists between the first inductor 103 and the third inductor 105.

[0081] Compared with the traditional common-source common-gate radio frequency amplifier, the radio frequency amplifier 10 provided by the embodiment also adopts the mode of magnetic field coupling between the first inductor 103 and the third inductor 105 to improve the gain of the radio frequency amplifier 10. In the radio frequency amplifier 10, the winding directions of the coils between the third inductor 105 and the first inductor 103 are same, so that the gate voltage of the first amplifying tube 101 is in phase with the gate voltage of the second amplifying tube 102, thereby ensuring that the gate driving signals of the second amplifying tube 102 and the first amplifying tube 101 are synchronized, avoiding phase cancellation, and the drain voltage of the first amplifying tube 101 after being amplified by the first amplifying tube 101 is opposite to the gate voltage of the first amplifying tube 101, so as to increase the gate-source voltage equivalent radio frequency swing of the second amplifying tube 102, and improve the gain of the second amplifying tube 102.

[0082] In some embodiments, please continue to refer to Figure 9 , the amplifying unit 100 in the radio frequency amplifier 10 further comprises a third resistor 110; the first end of the third resistor 110 is connected to the third bias voltage end, and the second end of the third resistor 110 is connected to the control end of the first inductor 103 and the first amplifying tube 101.

[0083] The third resistor 110 establishes a stable static working point for the gate of the first amplifying tube 101, ensures that the first amplifying tube 101 works in the saturation region, and provides a basis for the first amplifying tube 101 to realize high transconductance and high gain.

[0084] In some embodiments, please continue to refer toFigure 9 The radio frequency amplifier 10 further comprises a sixth inductor 111; a first end of the sixth inductor 111 is coupled to a first end of the direct current source, and a second end of the sixth inductor 111 is coupled to a second end of the second amplifying tube 102 and the radio frequency output end; and a second end of the direct current source is coupled to the ground end.

[0085] Here, the sixth inductor 111 is a choke inductor, the drain of the second amplifying tube 102 is connected to the positive pole of the direct current source through the sixth inductor 111, the sixth inductor 111 presents low impedance to direct current and provides stable direct current working voltage for the second amplifying tube 102; and presents high impedance to radio frequency signals, preventing radio frequency energy from leaking to the power supply end; and ensuring that the amplified radio frequency signals can be effectively transmitted to the radio frequency output end.

[0086] The radio frequency amplifier 10 has the advantages that the magnetic field coupling between the first inductor 103 and the second inductor 104 and between the first inductor 103 and the third inductor 105 is utilized to increase the gate-source voltage equivalent radio frequency swing of the first amplifying tube 101 and the gate-source voltage equivalent radio frequency swing of the second amplifying tube 102, thereby improving the gain of the first amplifying tube 101 and the second amplifying tube 102.

[0087] The present disclosure provides another radio frequency amplifier, in a specific example, please refer to Figure 10 which shows the structural schematic diagram of another radio frequency amplifier 10 provided by the embodiment of the present disclosure. As shown in Figure 10 , the number of amplifying units 100 in the radio frequency amplifier 10 is 2, and the first amplifying unit 100-1 and the second amplifying unit 100-2 share the same first inductor 103; the radio frequency amplifier further comprises a fourth inductor 106, the fourth inductor 106 and the first inductor 103 form a transformer 200, a first end of the fourth inductor 106 is coupled to the ground end, and a second end of the fourth inductor 106 is coupled to the radio frequency input end.

[0088] It should be noted that the radio frequency amplifier 10 in the embodiment is a gain-improved differential radio frequency amplifier, the first amplifying tube 101-1 and the first amplifying tube 101-2 belong to the same type of amplifying tube; the first amplifying tube 101-1 and the second amplifying tube 102-2 belong to different types of amplifying tubes; the first amplifying tube 101-1 and the second amplifying tube 102-1 belong to different types of amplifying tubes; the second amplifying tube 102-1 and the first amplifying tube 101-2 belong to different types of amplifying tubes; the second amplifying tube 102-1 and the second amplifying tube 102-2 belong to the same type of amplifying tube. The first amplifying tube 101-1 and the first amplifying tube 101-2 form a differential amplifying tube; the second amplifying tube 102-1 and the second amplifying tube 102-2 form a differential amplifying tube.

[0089] It should be further explained that the transformer 200 in the circuit is a balun transformer, which converts a single-ended signal into a differential signal based on a magnetically coupled transformer structure, and then serves as the input of the differential amplifier.

[0090] An RF signal is input to the second end of the fourth inductor. The RF signal passes through the balun to form a pair of differential signals. The differential signals control the conduction states of the first amplifier tube 101 - 1 and the first amplifier tube 101 - 2 to achieve signal amplification.

[0091] The fourth inductor 106 and the first inductor 103 have the same winding direction, while the first inductor 103 has opposite winding directions from the second inductor 104-1 and the second inductor 104-2. The gate voltage sensed by the first inductor 103 is in opposite phase to the source voltage sensed by the second inductor 104-1, and the gate voltage sensed by the first inductor 103 is in opposite phase to the source voltage sensed by the second inductor 104-2. Therefore, the effective RF voltage amplitude of the gate-source voltage of the first amplifier tube 101-1 is doubled, and the effective RF voltage amplitude of the gate-source voltage of the first amplifier tube 101-2 is doubled, directly increasing the equivalent RF swing and improving the gain of the first amplifier tubes 101-1 and 101-2.

[0092] In some embodiments, see Figure 10 The control end of the second amplifier tube 102 - 1 and the control end of the second amplifier tube 102 - 2 are coupled to the same first bias voltage end, and a first resistor 107 is connected in series between the control end of each second amplifier tube 102 and the first bias voltage end.

[0093] The second amplifier tube 102-1 and the first resistor 107-1, as well as the second amplifier tube 102-2 and the first resistor 107-2, respectively form an active bias network. The currents of the second amplifier tubes 102-1 and 102-2 are set by the bias voltage and the resistor, ensuring that the static operating points of the first amplifier tubes 101-1 and 101-2 match each other, thereby preventing gain fluctuations due to process deviations or temperature changes.

[0094] First resistor 107 is used to limit bias current and improve circuit linearity (i.e., the degree to which the circuit does not distort when amplifying a signal). The control terminals of second amplifier transistor 102-1 and second amplifier transistor 102-2 are typically controlled by common-mode feedback or a fixed bias voltage to ensure matching of the static operating points of the differential transistors (first amplifier transistor 101-1 and first amplifier transistor 101-2) and reduce the impact of common-mode noise.

[0095] In some embodiments, see Figure 10The amplifying unit 100 further includes a third resistor 110 ; a first end of the third resistor 110 is coupled to the third bias voltage end, and a second end of the third resistor 110 is coupled to the first inductor 103 and the control end of the first amplifying tube 101 .

[0096] The third resistor 110 exists in both amplifier units. The third resistor 110-1 establishes a stable static operating point for the gate of the first amplifier tube 101-1, and the third resistor 110-2 establishes a stable static operating point for the gate of the first amplifier tube 101-2, ensuring that the amplifier tubes operate in the saturation region, providing a basis for achieving high transconductance and high gain for the amplifier tubes.

[0097] It should be noted that the third resistor 110 - 1 refers to the third resistor of the first amplifying unit, and the third resistor 110 - 2 refers to the third resistor of the second amplifying unit.

[0098] In some embodiments, see Figure 10 The RF amplifier 10 also includes a sixth inductor 111; a first end of the sixth inductor 111 is coupled to the first end of the DC source, and a second end of the sixth inductor 111 is coupled to the second end of the second amplifier tube 102 and the RF output end; and a second end of the DC source is coupled to the ground end.

[0099] The drain of the second amplifier tube 102-1 is connected to the positive electrode of the DC source through the sixth inductor 111-1. The sixth inductor 111-1 presents low impedance to DC and provides a stable DC operating voltage for the second amplifier tube 102-1.

[0100] It should be noted that the sixth inductor 111 - 1 refers to the sixth inductor of the first amplifying unit, and the sixth inductor 111 - 2 refers to the sixth inductor of the second amplifying unit.

[0101] The drain of the second amplifier tube 102-2 is connected to the positive electrode of the DC source through the sixth inductor 111-2. The sixth inductor 111-2 presents low impedance to DC, providing a stable DC operating voltage for the second amplifier tube 102-2. It also presents high impedance to RF signals, preventing RF energy from leaking to the power supply end, ensuring that the amplified RF signal can be effectively transmitted to the RF output end.

[0102] The advantage of the RF amplifier 10 is that the balun transformer is used to convert the RF amplifier into a differential RF amplifier. The gains of the first amplifier tube 101-1 and the first amplifier tube 101-2 are increased through the magnetic coupling between the first inductor 103 and the fourth inductor 106 in the transformer 200, and the magnetic coupling between the first inductor 103 and the second inductor 104-1 and the second inductor 104-2, respectively.

[0103] The present disclosure provides yet another radio frequency amplifier, in a specific example, please refer to Figure 11 , which shows a structural schematic diagram of yet another radio frequency amplifier 10 provided by an embodiment of the present disclosure. As shown in Figure 11 , the amplification unit 100 further comprises a fifth inductor 108 and a second resistor 109; a first end of the fifth inductor 108-1 is coupled to the control end of the second amplification tube 102-1, a second end of the fifth inductor 108-2 is coupled to the control end of the second amplification tube 102-2, and the second end of the fifth inductor 108-1 is coupled to the first end of the fifth inductor 108-2; the first end of the second resistor 109 is coupled to the second end of the fifth inductor 108-1 and the first end of the fifth inductor 108-2, and the second end of the second resistor 109 is coupled to the second bias voltage end.

[0104] The winding direction of the fifth inductor 108-1 and the first inductor 103 is the same, the winding direction of the fifth inductor 108-2 and the first inductor 103 is the same, the winding direction of the fifth inductor 108-1 and the fifth inductor 108-2 is the same, the gate signal of the second amplification tube 102-1 is in phase with the gate signal of the first amplification tube 101-1, and the gate signal of the second amplification tube 102-2 is in phase with the gate signal of the first amplification tube 101-2; the gate signal of the second amplification tube 102-1 is opposite to the source signal, and the gate signal of the second amplification tube 102-2 is opposite to the source signal. Therefore, the effective radio frequency voltage amplitude between the gate and the source of the second amplification tube 102-1 is doubled, the effective radio frequency voltage amplitude between the gate and the source of the second amplification tube 102-2 is doubled, the equivalent radio frequency swing is directly increased, and the gain of the second amplification tube 102-1 and the second amplification tube 102-2 is improved.

[0105] In some embodiments, please continue to refer to Figure 11 , the winding direction of the fourth inductor 106 and the first inductor 103 is the same, the winding direction of the first inductor 103 and the second inductor 104-1 and the second inductor 104-2 is opposite, the gate voltage induced by the first inductor 103 is opposite to the source voltage induced by the second inductor 104-1, and the gate voltage induced by the first inductor 103 is opposite to the source voltage induced by the second inductor 104-2. Therefore, the effective radio frequency voltage amplitude between the gate and the source of the first amplification tube 101-1 is doubled, the effective radio frequency voltage amplitude between the gate and the source of the first amplification tube 101-2 is doubled, the equivalent radio frequency swing is directly increased, and the gain of the first amplification tube 101-1 and the first amplification tube 101-2 is improved.

[0106] In some embodiments, please continue to refer to Figure 11 , the amplification unit 100 further comprises a third resistor 110; the first end of the third resistor 110 is coupled to the third bias voltage end, and the second end of the third resistor 110 is coupled to the control end of the first inductor 103 and the first amplification tube 101.

[0107] The third resistor 110 exists in both of the two amplification units, the third resistor 110-1 establishes a stable static working point for the gate of the first amplification tube 101-1, and the third resistor 110-2 establishes a stable static working point for the gate of the first amplification tube 101-2, which ensures that the amplification tube works in the saturation region and provides a basis for the amplification tube to achieve high transconductance and high gain. In some embodiments, please continue to refer to Figure 11 , the radio frequency amplifier 10 further comprises a sixth inductor 111; the first end of the sixth inductor 111 is coupled to the first end of the direct current source, and the second end of the sixth inductor 111 is coupled to the second end of the second amplification tube 102 and the radio frequency output end; the second end of the direct current source is coupled to the ground end.

[0108] The sixth inductor 111-1 and the sixth inductor 111-2 are choke inductors. The drain of the second amplification tube 102-1 is connected to the positive electrode of the direct current source through the sixth inductor 111-1, and the sixth inductor 111-1 presents low impedance to direct current, thereby providing a stable direct current working voltage for the second amplification tube 102-1.

[0109] The drain of the second amplification tube 102-2 is connected to the positive electrode of the direct current source through the sixth inductor 111-2, and the sixth inductor 111 of the second amplification unit presents low impedance to direct current, thereby providing a stable direct current working voltage for the second amplification tube 102-2, and presents high impedance to radio frequency signals, thereby preventing radio frequency energy from leaking to the power supply end; and ensuring that the amplified radio frequency signals can be effectively transmitted to the radio frequency output end. The radio frequency amplifier 10 has the advantages that the radio frequency amplifier is converted into a differential radio frequency amplifier by using the balun transformer, the first inductor 103 is magnetically coupled with the second inductor 104-1 and the second inductor 104-2 respectively through the magnetic coupling of the first inductor 103 and the fourth inductor 106 in the transformer 200, and the fifth inductor 108-1 and the fifth inductor 108-2 are respectively magnetically coupled with the first inductor 103, thereby improving the gain of the first amplification tube 101-1, the first amplification tube 101-2, the second amplification tube 102-1 and the second amplification tube 102-2.

[0110] In still another embodiment of the present application, see Figure 12 , which shows a structural schematic diagram of an electronic device 20 provided by an embodiment of the present application. As shown in Figure 12 , the electronic device 20 at least comprises the radio frequency amplifier 10 described in the foregoing embodiments.

[0111] The above merely describes preferred embodiments of the present disclosure, but is not intended to limit the protection scope of the present disclosure. It should be explained that, in the present application, the terms "comprising", "containing" or any other variants thereof are intended to cover non-exclusive containing, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0112] The above-mentioned sequence numbers of the embodiments of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0113] The methods disclosed in the several method embodiments provided by the present application can be combined arbitrarily without conflict to obtain new method embodiments.

[0114] The features disclosed in the several product embodiments provided by the present application can be combined arbitrarily without conflict to obtain new product embodiments.

[0115] The features disclosed in the several method or device embodiments provided by the present application can be combined arbitrarily without conflict to obtain new method or device embodiments.

[0116] The above merely describes specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A radio frequency amplifier, characterized in that: The radio frequency amplifier includes an amplifying unit, and the amplifying unit includes a first amplifying tube, a second amplifying tube, a first inductor and a second inductor; The control end of the first amplifier tube is coupled to the RF input end, the first end of the first amplifier tube is coupled to the ground end, and the second end of the first amplifier tube is connected to the first end of the second amplifier tube; the control end of the second amplifier tube is coupled to the first bias voltage end, and the second end of the second amplifier tube is coupled to the RF output end; The first inductor is connected in series between the control end of the first amplifier tube and the RF input end, and the second inductor is connected in series between the first end of the first amplifier tube and the ground end. The first inductor and the second inductor are located close to each other, so that magnetic field coupling exists between the first inductor and the second inductor.

2. The radio frequency amplifier according to claim 1, wherein: A third inductor is connected in series between the control terminal of the second amplifier tube and the first bias voltage terminal; The third inductor is located close to the first inductor, so that magnetic field coupling exists between the first inductor and the third inductor.

3. The radio frequency amplifier according to claim 2, wherein: The winding directions of the first inductor and the second inductor are opposite; The first inductor and the third inductor have the same winding direction.

4. The radio frequency amplifier according to claim 1, wherein: The number of the amplifying units is 2, and the first amplifying unit and the second amplifying unit share the same first inductor; The RF amplifier further includes a fourth inductor. The fourth inductor and the first inductor are combined to form a transformer. A first end of the fourth inductor is coupled to the ground end, and a second end of the fourth inductor is coupled to the RF input end.

5. The radio frequency amplifier according to claim 4, characterized in that: The fourth inductor and the first inductor have the same winding direction; The second inductor of the first amplifying unit and the second inductor of the second amplifying unit have the same winding direction.

6. The radio frequency amplifier according to claim 4, characterized in that: The second inductor of the second amplifying unit is located close to the first inductor, so that magnetic field coupling exists between the second inductor and the first inductor.

7. The radio frequency amplifier according to claim 4, characterized in that: The control end of the second amplifier tube of the first amplifier unit and the control end of the second amplifier tube of the second amplifier unit are coupled to the same first bias voltage end, and a first resistor is connected in series between the control end of each second amplifier tube and the first bias voltage end.

8. The radio frequency amplifier according to claim 4, characterized in that: The amplifying unit further includes a fifth inductor and a second resistor; A first end of the fifth inductor of the first amplifying unit is coupled to the control end of the second amplifying tube of the first amplifying unit, a second end of the fifth inductor of the second amplifying unit is coupled to the control end of the second amplifying tube of the second amplifying unit, and a second end of the fifth inductor of the first amplifying unit is coupled to the first end of the fifth inductor of the second amplifying unit; A first end of the second resistor is coupled to the second end of the fifth inductor of the first amplifying unit and the first end of the fifth inductor of the second amplifying unit, and a second end of the second resistor is coupled to the second bias voltage terminal.

9. The radio frequency amplifier according to claim 8, characterized in that: The fifth inductor and the first inductor have the same winding direction; The fifth inductor of the first amplifying unit and the fifth inductor of the second amplifying unit have the same winding direction; The fifth inductor is located close to the first inductor, so that magnetic field coupling exists between the first inductor and the fifth inductor.

10. The radio frequency amplifier according to any one of claims 1 to 9, characterized in that: The amplifying unit further includes a third resistor; A first end of the third resistor is coupled to the third bias voltage terminal, and a second end of the third resistor is coupled to the first inductor and the control terminal of the first amplifier tube.

11. The radio frequency amplifier according to claim 10, characterized in that: The radio frequency amplifier further includes a sixth inductor; The first end of the sixth inductor is coupled to the first end of the DC source, and the second end of the sixth inductor is coupled to the second end of the second amplifier tube and the RF output end; The second terminal of the DC source is coupled to the ground.

12. An electronic device, characterized in that: The electronic device at least includes the radio frequency amplifier according to any one of claims 1 to 10.

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