Radio frequency amplifier

Abstract

This invention provides a radio frequency (RF) amplification device, comprising an amplifier and a resonant circuit. The amplifier receives an RF signal at its input terminal. The amplifier amplifies a first frequency component of the RF signal and outputs it to its output terminal. A first terminal and a second terminal of the resonant circuit are respectively coupled to the input terminal and the output terminal of the amplifier. The resonant circuit provides a low-impedance path for the second frequency component of the RF signal between the input and output terminals of the amplifier, and provides a high-impedance path for the first frequency component of the RF signal between the input and output terminals of the amplifier.

Description

Technical Field

[0001] This invention relates to an amplifier circuit, and more particularly to a radio frequency amplifier (RFamplifier) ​​device. Background Technology

[0002] Radio frequency (RF) amplifiers can amplify or process electronic signals. In communication systems, RF amplifiers can amplify small radio frequency (RF) signals received by an antenna. In practical applications, out-of-band (OOB) noise may be injected into the received RF signal. OOB noise will affect the sensitivity of the measurement system. How to suppress out-of-band noise at specific frequencies is one of the important technical issues in this field. Summary of the Invention

[0003] This invention provides a radio frequency amplification device to achieve out-of-band (OOB) suppression of the amplifier.

[0004] In one embodiment of the present invention, the radio frequency amplification device includes a first amplifier and a first resonant circuit. The input terminal of the first amplifier is adapted to be coupled to a signal providing terminal to input a first radio frequency signal. The first amplifier amplifies a first frequency component of the first radio frequency signal and outputs it to the output terminal of the first amplifier. A first terminal and a second terminal of the first resonant circuit are respectively coupled to the input terminal and the output terminal of the first amplifier. The first resonant circuit provides a first low-impedance path between the input terminal and the output terminal of the first amplifier for the second frequency component of the first radio frequency signal, and provides a first high-impedance path between the input terminal and the output terminal of the first amplifier for the first frequency component of the first radio frequency signal.

[0005] Based on the above, in various embodiments of the present invention, the first resonant circuit is configured in a radio frequency amplification device. The first resonant circuit can provide a low-impedance path between the input and output terminals of the first amplifier for the second frequency component of the first radio frequency signal. Therefore, out-of-band noise can be effectively suppressed.

[0006] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of a circuit block of a radio frequency device according to an embodiment of the present invention. Figure 2 This is described according to an embodiment of the present invention. Figure 1 The circuit module diagram of the resonant circuit shown is illustrated. Figure 3 This is described according to another embodiment of the present invention. Figure 1 The circuit module diagram of the resonant circuit shown is illustrated. Figure 4 This is described according to yet another embodiment of the present invention. Figure 1 The circuit module diagram of the resonant circuit shown is illustrated. Figure 5 This is described according to another embodiment of the present invention. Figure 1 The circuit module diagram of the resonant circuit shown is illustrated. Figure 6 This is a description based on a further embodiment of the invention. Figure 1 The circuit module diagram of the resonant circuit shown is illustrated. Figure 7 This is a schematic diagram of a circuit module of a radio frequency device according to another embodiment of the present invention. Figure 8 This is described according to an embodiment of the present invention. Figure 7 The circuit module diagram of the resonant circuit shown is illustrated. Figure 9 This is described according to another embodiment of the present invention. Figure 7 The circuit module diagram of the resonant circuit shown is illustrated. Figure 10 This is described according to yet another embodiment of the present invention. Figure 7 The circuit module diagram of the resonant circuit shown is illustrated. Figure 11 This is described according to another embodiment of the present invention. Figure 7 The circuit module diagram of the resonant circuit shown is illustrated. Figure 12 This is a description based on a further embodiment of the invention. Figure 7 The circuit module diagram of the resonant circuit shown is illustrated. Figure 13 This is a schematic diagram of a circuit module of a radio frequency device according to another embodiment of the present invention. Figure 14 This is described according to an embodiment of the present invention. Figure 13 The circuit module diagram of the resonant circuit shown is illustrated. Figure 15 This is described according to another embodiment of the present invention. Figure 13 The circuit module diagram of the resonant circuit shown is illustrated. Figure 16 This is described according to another embodiment of the present invention. Figure 13 The circuit module diagram of the resonant circuit shown is illustrated. Figure 17 This is a schematic diagram of a circuit module of a radio frequency device according to another embodiment of the present invention. Figure 18 This is described according to an embodiment of the present invention. Figure 17 The circuit module diagram of the resonant circuit shown is illustrated. Figure 19 This is described according to another embodiment of the present invention. Figure 17 The circuit module diagram of the resonant circuit shown is illustrated. Figure 20 This is described according to yet another embodiment of the present invention. Figure 17 The circuit module diagram of the resonant circuit shown is illustrated. Figure 21 This is a schematic diagram of a circuit module of a radio frequency device according to a further embodiment of the present invention. [Symbol Explanation] 10: Second Amplifier 11, 12, 21, 22: Radio frequency signals 20: Antenna 100: Radio Frequency Amplification Device 110: First Amplifier 120: Resonance Circuit P2G: 2G path P5G: 5G Path Detailed Implementation

[0008] The term "coupled (or connected)" as used throughout this specification (including the scope of the claims) may refer to any direct or indirect means of connection. For example, if the text describes a first device coupled (or connected) to a second device, it should be interpreted as the first device being directly connected to the second device, or the first device being indirectly connected to the second device through other devices or some means of connection. The terms "first," "second," etc., used throughout this specification (including the scope of the claims) are used to name components or distinguish different embodiments or scopes, and are not intended to limit the upper or lower limit of the number of components, nor to limit the order of components. Furthermore, wherever possible, components / components / steps using the same reference numerals in the drawings and embodiments represent the same or similar parts. Components / components / steps using the same reference numerals or the same terms in different embodiments may be referred to mutually in the relevant descriptions.

[0009] Figure 1 This is a schematic diagram of a circuit block of a radio frequency device according to an embodiment of the present invention. Figure 1The illustrated radio frequency (RF) device includes a signal providing terminal, an RF amplification device 100 having a first amplifier 110 and a resonant circuit 120, and a second amplifier 20. In this embodiment, the signal providing terminal is, for example, an antenna 20, and the second amplifier 10 is, for example, a power amplifier. In some applications, the antenna 20 may be shared by RF circuits in different frequency bands. For example (but not limited to), the RF amplification device 100 may be configured in a 5G path (P5G), and the second amplifier 10 may be configured in a 2G path (P2G). The RF amplification device 100 amplifies the 5G signal (RF signal 21) received by the antenna 20 to output an amplified 5G signal (RF signal 22) to the next stage circuit (not shown). The second amplifier 10 amplifies the 2G signal (RF signal 11) output by the previous stage circuit (not shown) to output an amplified 2G signal (amplified RF signal 12) to the antenna 20.

[0010] In practical applications, out-of-band (OOB) noise may be injected into the RF signal of the 5G path P5G. For example, assuming the frequency f of the RF signal 12 in the 2G path P2G is 2.45 GHz, OOB noise at frequency 2f (i.e., 4.9 GHz) may couple into the 5G path P5G. The power of the OOB noise at frequency 2f in the 5G path P5G will be amplified, degrading the performance of the first amplifier 110, such as its linearity. The following embodiments will illustrate how to suppress out-of-band noise in the 5G path P5G.

[0011] Figure 1The illustrated RF amplification device 100 includes a first amplifier 110 and a resonant circuit 120. This embodiment does not limit the implementation of the first amplifier 110. In this embodiment, the first amplifier 110 may be a low-noise amplifier (LNA). The input terminal of the first amplifier 110 is adapted to be coupled to a signal providing terminal (e.g., antenna 20) to input an RF signal 21. The first amplifier 110 amplifies the RF signal 21 and then outputs the amplified RF signal 22 to the output terminal of the first amplifier 110. The RF signal 21 received by the antenna 20 includes a first frequency component f1, while the amplified RF signal 12 output by the second amplifier 10 includes a second frequency component f2. The second frequency component f2 of the amplified RF signal 12 is coupled to the 5G path P5G and becomes the second frequency component f2 of the RF signal 21. Depending on design requirements, in some embodiments, the first amplifier 110 may also be a power amplifier, in which case the antenna 20 may be replaced by an RF processing circuit as a signal providing terminal for the RF signal 21, and the second amplifier 10 coupled to the signal providing terminal may be a low-noise amplifier.

[0012] The first and second terminals of the resonant circuit 120 are respectively coupled to the input and output terminals of the first amplifier 110. The resonant circuit 120 provides a high-impedance path between the input and output terminals of the first amplifier 110 for the first frequency component f1 of the radio frequency signal 21. The resonant circuit 120 also provides a low-impedance path between the input and output terminals of the first amplifier 110 for the second frequency component f2 (i.e., OOB noise) of the radio frequency signal 21. In this embodiment, the high-impedance and low-impedance paths are used to describe the impedance relationship between the two, not to limit their impedance values. In this embodiment, it means that the impedance of the resonant circuit 120 to the first frequency component f1 of the radio frequency signal 21 is greater than the impedance of the resonant circuit 120 to the second frequency component f2 of the radio frequency signal 21.

[0013] Based on the above, the resonant circuit 120 described in this embodiment is configured in the radio frequency amplification device 100. The resonant circuit 120 can provide a low-impedance path between the input and output terminals of the first amplifier 110 to the second frequency component f2 (i.e., OOB noise) of the radio frequency signal 21, thereby forming a negative feedback path for the second frequency component f2 from the output terminal to the input terminal, while reducing the interference of the first frequency component f1 between the input and output terminals to maintain gain. Therefore, OOB noise can be effectively suppressed.

[0014] Figure 2 This is described according to an embodiment of the present invention. Figure 1 The circuit module diagram of the resonant circuit 120 shown is shown. Figure 2The resonant circuit 120 shown includes a resonant component 121 and a resonant component 122. The first end of resonant component 121 and the first end of resonant component 122 are coupled to the first end of the resonant circuit 120, that is, coupled to the input terminal of the first amplifier 110. The second end of resonant component 121 and the second end of resonant component 122 are coupled to the second end of the resonant circuit 120, that is, coupled to the output terminal of the first amplifier 110.

[0015] exist Figure 2 In the illustrated embodiment, resonant component 121 includes capacitor C1, while resonant component 122 includes capacitor C2 and resistor R1. The first and second terminals of capacitor C1 are coupled to the first and second terminals of resonant circuit 120, respectively. Resistor R1 and capacitor C2 are connected in series between the first and second terminals of resonant circuit 120. Resonant components 121 and 122 together provide a high-impedance path to the first frequency component f1 of radio frequency signal 21. Resonant component 122 provides a low-impedance path to the second frequency component f2 of radio frequency signal 21.

[0016] Figure 3 This is described according to another embodiment of the present invention. Figure 1 The circuit module diagram of the resonant circuit 120 shown is shown. Figure 3 The resonant circuit 120 shown includes resonant component 121 and resonant component 123. Resonant component 121 and resonant component 123 can be referenced... Figure 2 The descriptions of resonant components 121 and 122 shown are analogous and will not be repeated here. Figure 3 In the illustrated embodiment, resonant component 123 includes capacitor C2 and inductor L1. Inductor L1 and capacitor C2 are connected in series between the first terminal and the second terminal of resonant circuit 120. Resonant components 121 and 123 together provide a high-impedance path to the first frequency component f1 of RF signal 21. Resonant component 123 provides a low-impedance path to the second frequency component f2 of RF signal 21.

[0017] anyway, Figure 1 The implementation of the resonant circuit 120 shown should not be limited to Figure 2 and Figure 3 The illustrated embodiment. For example, the resonant circuit 120 may include more resonant components. Figure 4 This is described according to yet another embodiment of the present invention. Figure 1 The circuit module diagram of the resonant circuit 120 shown is shown. Figure 4 The resonant circuit 120 shown includes a resonant component 121 and n resonant components 123 (e.g., ...). Figure 4The resonant components 123-1 and 123-n are shown, where n is an integer determined according to design requirements. For example, n resonant components 123 can provide n low-impedance paths to n different frequencies of OOB noise for the RF signal 21. Resonant component 121 can be referenced... Figure 2 The description of resonant component 121 is shown below, while resonant components 123-1 to 123-n can be found in the following description: Figure 3 The relevant descriptions of the resonant components 123 shown are analogous, so they will not be repeated here.

[0018] Figure 5 This is described according to another embodiment of the present invention. Figure 1 The circuit module diagram of the resonant circuit 120 shown is shown. Figure 5 The resonant circuit 120 shown includes a resistor R2, a capacitor C3, a capacitor C4, and an inductor L2. Capacitor C3 and resistor R2 are connected between the first and second terminals of the resonant circuit 120. Inductor L2 and capacitor C4 are connected in series between the first and second terminals of capacitor C3.

[0019] Figure 6 This is a description based on a further embodiment of the invention. Figure 1 The circuit module diagram of the resonant circuit 120 shown is shown. Figure 6 The resonant circuit 120 shown includes capacitors C5, C6, C7, and C8, inductor L3, and inductor L4. Capacitor C5 is coupled between the first terminal of the first resonant circuit 120 and a common node N1. Inductor L3 and capacitor C6 are connected in series between the first terminal of the resonant circuit 120 and the common node N1. Capacitor C7 is coupled between the common node N1 and the second terminal of the resonant circuit 120. Inductor L4 and capacitor C8 are connected in series between the common node N1 and the second terminal of the resonant circuit 120.

[0020] Figure 7 This is a schematic diagram of a circuit module of a radio frequency device according to another embodiment of the present invention. Figure 7 The radio frequency device shown includes an antenna 20 and a radio frequency amplifier 700. The radio frequency amplifier 700 amplifies the radio frequency signal 21 received by the antenna 20 and outputs the amplified radio frequency signal 22 to the next stage circuit (not shown). Figure 7 The antenna 20, radio frequency signal 21, radio frequency signal 22, and radio frequency amplification device 700 shown can be referenced. Figure 1 The descriptions of antenna 20, radio frequency signal 21, radio frequency signal 22 and radio frequency amplifier 100 are similar and will not be repeated here.

[0021] Figure 7 The radio frequency amplification device 700 shown includes a first amplifier 110, a resonant circuit 120, and a resonant circuit 730. Figure 7The first amplifier 110 and resonant circuit 120 shown can be referenced. Figures 1 to 6 The descriptions of the first amplifier 110 and the resonant circuit 120 shown are analogous to those in the diagram, and will not be repeated here. Figure 7 In the illustrated embodiment, a first terminal of the resonant circuit 730 is coupled to a signal providing terminal (e.g., antenna 20) to receive a radio frequency (RF) signal 21. A second terminal of the resonant circuit 730 is coupled to the input terminal of a first amplifier 110 to provide an RF signal 23. The resonant circuit 730 can provide a low-impedance path between its first and second terminals to a first frequency component f1 of the RF signal 21 to generate the RF signal 23. The resonant circuit 730 can also provide a high-impedance path between its first and second terminals to a third frequency component f3 (i.e., OOB noise) of the RF signal 21. In one embodiment, the third frequency component f3 is the same as the aforementioned second frequency component f2 to enhance the suppression of OOB noise with the aforementioned second frequency component f2. In this embodiment, this means that the impedance of the resonant circuit 730 to the third frequency component f3 of the RF signal 21 is greater than the impedance of the resonant circuit 730 to the first frequency component f1 of the RF signal 21.

[0022] Based on the above, the resonant circuit 730 described in this embodiment is configured in the radio frequency amplification device 700. The resonant circuit 730 can provide a high-impedance path between the input terminal of the first amplifier 110 and the antenna 20 to the third frequency component f3 (i.e., OOB noise) of the radio frequency signal 21. Therefore, OOB noise can be effectively suppressed.

[0023] Figure 8 This is described according to an embodiment of the present invention. Figure 7 The circuit module diagram of the resonant circuit 730 shown is illustrated. Figure 8 The resonant circuit 730 shown includes capacitors C9 and C10, and inductor L5. A first terminal of capacitor C9 is adapted to be coupled to a signal providing terminal (e.g., antenna 20). A second terminal of capacitor C9 is coupled to the input terminal of a first amplifier 110. Inductor L5 and capacitor C10 are connected in series between the first and second terminals of capacitor C9.

[0024] Figure 9 This is described according to another embodiment of the present invention. Figure 7 The circuit module diagram of the resonant circuit 730 shown is illustrated. Figure 9 The resonant circuit 730 shown includes capacitors C9, C10, and C11, inductor L5, and inductor L6. The first terminal of capacitor C9 is adapted to be coupled to a signal providing terminal (e.g., antenna 20). The second terminal of capacitor C9 is coupled to the input terminal of the first amplifier 110. Inductor L5 and capacitor C10 are connected in series between the first and second terminals of capacitor C9. Inductor L6 and capacitor C11 are connected in series between the first and second terminals of capacitor C9.

[0025] Figure 10 This is described according to yet another embodiment of the present invention. Figure 7 The circuit module diagram of the resonant circuit 730 is shown. In this embodiment, the first amplifier 110 is more suitable as a power amplifier, and the antenna 20 can be replaced by a radio frequency processing circuit to serve as a signal provider for the radio frequency signal 21. Figure 10 The resonant circuit 730 shown includes a resistor R3, a capacitor C12, a capacitor C13, and an inductor L7. The first terminal of resistor R3 is adapted to be coupled to a signal supply terminal. Capacitor C12 and resistor R3 are connected in series between the signal supply terminal and the input terminal of the first amplifier 110. Inductor L7 and capacitor C13 are connected in series between the first and second terminals of capacitor C12.

[0026] Figure 11 This is described according to another embodiment of the present invention. Figure 7 The circuit module diagram of the resonant circuit 730 shown is illustrated. Figure 11 The resonant circuit 730 shown includes capacitors C14, C15, C16, and C17, inductor L8, and inductor L9. Capacitor C14 is coupled between the signal providing terminal (e.g., antenna 20) and common node N2. Inductor L8 and capacitor C15 are connected in series between the signal providing terminal (e.g., antenna 20) and common node N2. Capacitor C16 is coupled between common node N2 and the input terminal of the first amplifier 110. Inductor L9 and capacitor C17 are connected in series between common node N2 and the input terminal of the first amplifier 110.

[0027] Figure 12 This is a description based on a further embodiment of the invention. Figure 7 The circuit module diagram of the resonant circuit 730 shown is illustrated. Figure 12 The resonant circuit 730 shown includes a capacitor C18 and an inductor L10. A first terminal of capacitor C18 is adapted to be coupled to a signal providing terminal (e.g., antenna 20). A second terminal of capacitor C18 is coupled to the input terminal of a first amplifier 110. The first and second terminals of inductor L10 are coupled to the first and second terminals of capacitor C18, respectively.

[0028] Figure 13 This is a schematic diagram of a circuit module of a radio frequency device according to another embodiment of the present invention. Figure 13 The radio frequency device shown includes an antenna 20 and a radio frequency amplifier 1300. The radio frequency amplifier 1300 can amplify the radio frequency signal 21 received by the antenna 20 to output the amplified radio frequency signal 22 to the next stage circuit (not shown). Figure 13 The antenna 20, radio frequency signal 21, radio frequency signal 22, and radio frequency amplification device 1300 shown can be referenced. Figure 1The descriptions of antenna 20, radio frequency signal 21, radio frequency signal 22 and radio frequency amplifier 100 are similar and will not be repeated here.

[0029] Figure 13 The radio frequency amplification device 1300 shown includes a first amplifier 110, a resonant circuit 120, and a resonant circuit 1340. Figure 13 The first amplifier 110 and resonant circuit 120 shown can be referenced. Figures 1 to 6 The descriptions of the first amplifier 110 and the resonant circuit 120 shown are analogous to those in the diagram, and will not be repeated here. Figure 13 In the illustrated embodiment, a first terminal of the resonant circuit 1340 is coupled to the input terminal of the first amplifier 110 to receive the radio frequency signal 21. A second terminal of the resonant circuit 1340 is coupled to a reference voltage terminal REF (e.g., ground voltage or other fixed voltage). The resonant circuit 1340 can provide a high-impedance path between its first and second terminals to the first frequency component f1 of the radio frequency signal 21. The resonant circuit 1340 can also provide a low-impedance path between its first and second terminals to the second frequency component f2 (i.e., OOB noise) of the radio frequency signal 21. In this embodiment, this means that the impedance of the resonant circuit 1340 to the first frequency component f1 of the radio frequency signal 21 is greater than the impedance of the resonant circuit 1340 to the second frequency component f2 of the radio frequency signal 21.

[0030] Based on the above, the resonant circuit 1340 described in this embodiment is configured in the radio frequency amplification device 1300. The resonant circuit 1340 can provide a low-impedance path between the input terminal of the first amplifier 110 and the reference voltage terminal REF to the second frequency component f2 (i.e., OOB noise) of the radio frequency signal 21. Therefore, OOB noise can be effectively suppressed.

[0031] Figure 14 This is described according to an embodiment of the present invention. Figure 13 The circuit module diagram of the resonant circuit 1340 shown is illustrated. Figure 14 The resonant circuit 1340 shown includes inductors L11 and L12, and capacitor C19. The first terminal of inductor L11 is coupled to the first terminal of the resonant circuit 1340, that is, coupled to the input terminal of the first amplifier 110. The first terminal of inductor L12 is coupled to the second terminal of inductor L11. The second terminal of inductor L12 is coupled to the second terminal of the resonant circuit 1340, that is, coupled to the reference voltage terminal REF. The first and second terminals of capacitor C19 are respectively coupled to the first and second terminals of inductor L12.

[0032] Figure 15 This is described according to another embodiment of the present invention. Figure 13 The circuit module diagram of the resonant circuit 1340 shown is illustrated. Figure 15The resonant circuit 1340 shown includes inductors L13, L14, L15, and capacitor C20. The first terminal of inductor L13 is coupled to the first terminal of the resonant circuit 1340, i.e., coupled to the input terminal of the first amplifier 110. The first terminal of capacitor C20 is coupled to the second terminal of inductor L13. The first terminal of inductor L14 is coupled to the second terminal of capacitor C20. The second terminal of inductor L14 is coupled to the second terminal of the resonant circuit 1340, i.e., coupled to the reference voltage terminal REF. The first and second terminals of inductor L15 are respectively coupled to the first terminal of capacitor C20 and the second terminal of inductor L14.

[0033] Figure 16 This is described according to another embodiment of the present invention. Figure 13 The circuit module diagram of the resonant circuit 1340 shown is illustrated. Figure 16 The resonant circuit 1340 shown includes an inductor L16, a capacitor C21, and a capacitor C22. The first terminal of inductor L16 is coupled to the first terminal of resonant circuit 1340, that is, coupled to the input terminal of the first amplifier 110. The first terminal of capacitor C21 is coupled to the second terminal of inductor L16. The second terminal of capacitor C21 is coupled to the second terminal of resonant circuit 1340, that is, coupled to the reference voltage terminal REF. The first and second terminals of capacitor C22 are coupled to the first terminal of inductor L16 and the second terminal of capacitor C21, respectively.

[0034] Figure 17 This is a schematic diagram of a circuit module of a radio frequency device according to another embodiment of the present invention. Figure 17 The radio frequency device shown includes an antenna 20 and a radio frequency amplifier 1700. The radio frequency amplifier 1700 can amplify the radio frequency signal 21 received by the antenna 20 to output the amplified radio frequency signal 22 to the next stage circuit (not shown). Figure 17 The antenna 20, radio frequency signal 21, radio frequency signal 22, and radio frequency amplification device 1700 shown can be referenced. Figure 1 The descriptions of antenna 20, radio frequency signal 21, radio frequency signal 22 and radio frequency amplifier 100 are similar and will not be repeated here.

[0035] Figure 17 The radio frequency amplification device 1700 shown includes a first amplifier 110, a resonant circuit 120, and a resonant circuit 1750. Figure 17 The first amplifier 110 and resonant circuit 120 shown can be referenced. Figures 1 to 6 The descriptions of the first amplifier 110 and the resonant circuit 120 shown are analogous to those in the diagram, and will not be repeated here. Figure 17In the illustrated embodiment, a first terminal of the resonant circuit 1750 is coupled to a reference terminal of the first amplifier 110 (the reference terminal is used to receive a reference voltage). A second terminal of the resonant circuit 1750 is coupled to a reference voltage terminal REF (e.g., ground voltage or other fixed voltage). The resonant circuit 1750 can provide a high-impedance path between its first and second terminals to the first frequency component f1. The resonant circuit 1750 can also provide a low-impedance path between its first and second terminals to the second frequency component f2 (i.e., OOB noise). Figure 17 In this embodiment, the first amplifier 110 may be a transistor having a first terminal (1), a second terminal (2), and a control terminal (C). The first terminal (1) may be the output terminal of the first amplifier 110, the second terminal (2) may be the reference terminal of the first amplifier 110, and the control terminal (C) may be the input terminal of the first amplifier 110. In this embodiment, it means that the impedance of the resonant circuit 1750 to the first frequency component f1 is greater than the impedance of the resonant circuit 1750 to the second frequency component f2.

[0036] Based on the above, the resonant circuit 1750 described in this embodiment is configured in the radio frequency amplification device 1700. The resonant circuit 1750 can provide a low-impedance path between the reference terminal and the reference voltage terminal REF of the first amplifier 110 to the second frequency component f2 (i.e., OOB noise). Therefore, OOB noise can be effectively suppressed.

[0037] Figure 18 This is described according to an embodiment of the present invention. Figure 17 The circuit module diagram of the resonant circuit 1750 is shown. Figure 18 The resonant circuit 1750 shown includes inductors L17 and L18, and capacitor C23. The first terminal of inductor L17 is coupled to the first terminal of the resonant circuit 1750, that is, coupled to the reference terminal of the first amplifier 110. The first terminal of inductor L18 is coupled to the second terminal of inductor L17. The second terminal of inductor L18 is coupled to the second terminal of the resonant circuit 1750, that is, coupled to the reference voltage terminal REF. The first and second terminals of capacitor C23 are coupled to the first and second terminals of inductor L18, respectively.

[0038] Figure 19 This is described according to another embodiment of the present invention. Figure 17 The circuit module diagram of the resonant circuit 1750 is shown. Figure 19The resonant circuit 1750 shown includes inductors L19, L20, L21, and capacitor C24. The first terminal of inductor L19 is coupled to the first terminal of the resonant circuit 1750, i.e., coupled to the reference terminal of the first amplifier 110. The first terminal of capacitor C24 is coupled to the second terminal of inductor L19. The first terminal of inductor L20 is coupled to the second terminal of capacitor C24. The second terminal of inductor L20 is coupled to the second terminal of the resonant circuit 1750, i.e., coupled to the reference voltage terminal REF. The first and second terminals of inductor L21 are respectively coupled to the first terminal of capacitor C24 and the second terminal of inductor L20.

[0039] Figure 20 This is described according to yet another embodiment of the present invention. Figure 17 The circuit module diagram of the resonant circuit 1750 is shown. Figure 20 The resonant circuit 1750 shown includes an inductor L22, a capacitor C25, and a capacitor C26. The first terminal of inductor L22 is coupled to the first terminal of resonant circuit 1750, that is, coupled to the reference terminal of the first amplifier 110. The first terminal of capacitor C25 is coupled to the second terminal of inductor L22. The second terminal of capacitor C25 is coupled to the second terminal of resonant circuit 1750, that is, coupled to the reference voltage terminal REF. The first and second terminals of capacitor C26 are coupled to the first terminal of inductor L22 and the second terminal of capacitor C25, respectively.

[0040] Figure 21 This is a schematic diagram of a circuit module of a radio frequency device according to a further embodiment of the present invention. Figure 21 The radio frequency device shown includes an antenna 20 and a radio frequency amplifier 2100. The radio frequency amplifier 2100 can amplify the radio frequency signal 21 received by the antenna 20 to output the amplified radio frequency signal 22 to the next stage circuit (not shown). Figure 21 The antenna 20, radio frequency signal 21, radio frequency signal 22, and radio frequency amplification device 2100 shown can be referenced. Figure 1 The descriptions of antenna 20, radio frequency signal 21, radio frequency signal 22 and radio frequency amplifier 100 are similar and will not be repeated here.

[0041] Figure 21 The radio frequency amplification device 2100 shown includes a first amplifier 110, a resonant circuit 120, a resonant circuit 730, a resonant circuit 1340, and a resonant circuit 1750. Figure 21 The first amplifier 110 and resonant circuit 120 shown can be referenced. Figures 1 to 6 The relevant descriptions of the first amplifier 110 and the resonant circuit 120 shown can be used as a reference. Figure 21 The resonant circuit 730 shown can be referenced. Figures 7 to 12 The relevant descriptions of the resonant circuit 730 shown can be used as a deduction. Figure 21 The resonant circuit 1340 shown can be referenced. Figures 13 to 16 The relevant descriptions of the resonant circuit 1340 shown can be used as a reference. Figure 21 The resonant circuit 1750 shown can be referenced. Figures 17 to 20 The relevant descriptions of the resonant circuit 1750 shown are analogous, so they will not be repeated here.

[0042] In summary, the resonant circuits 120, 730, 1340, and / or 1750 described in the above embodiments are configured in an RF amplification device. Resonant circuit 120 provides a low-impedance path between the input and output of the first amplifier 110 to the second frequency component f2 (i.e., OOB noise). Resonant circuit 730 provides a high-impedance path between the antenna 20 and the input of the first amplifier 110 to the third frequency component f3 (i.e., OOB noise). Resonant circuit 1340 provides a low-impedance path between the input of the first amplifier 110 and the reference voltage terminal REF to the second frequency component f2 (i.e., OOB noise). Resonant circuit 1750 provides a low-impedance path between the reference terminal of the first amplifier 110 and the reference voltage terminal REF to the second frequency component f2 (i.e., OOB noise). Therefore, OOB noise can be effectively suppressed.

[0043] Although the present invention has been disclosed above by way of embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope of the claims.

Claims

1. A radio frequency amplification device, characterized by, include: A first amplifier has an input terminal adapted to be coupled to a signal providing terminal to input a first radio frequency signal, wherein the first amplifier is used to amplify a first frequency component of the first radio frequency signal and output it to an output terminal of the first amplifier; and A first resonant circuit has a first terminal and a second terminal respectively coupled to the input terminal and the output terminal of the first amplifier, wherein the first resonant circuit is used to: A first low-impedance path is provided between the input and output of the first amplifier for a second frequency component of the first radio frequency signal. This first low-impedance path forms a negative feedback path for the second frequency component, extending from the output to the input of the first amplifier, thereby suppressing the second frequency component. A first high-impedance path is provided between the input and output of the first amplifier for the first frequency component of the first radio frequency signal.

2. The radio frequency amplification device of claim 1, wherein the signal providing end is more adapted to be coupled to a second amplifier for outputting an amplified radio frequency signal, wherein the amplified radio frequency signal includes the second frequency component.

3. The radio frequency amplification device of claim 1, wherein, The first resonant circuit includes: A first resonant component having a first terminal and a second terminal respectively coupled to the first terminal and the second terminal of the first resonant circuit; and A second resonant component has a first end and a second end respectively coupled to the first end and the second end of the first resonant circuit.

4. The radio frequency amplification device of claim 3, wherein, The first resonant component includes: A first capacitor has a first terminal and a second terminal respectively coupled to the first terminal and the second terminal of the first resonant circuit.

5. The radio frequency amplification device as described in claim 3, characterized in that, The second resonant component includes: A second capacitor; and A resistor, wherein the resistor and the second capacitor are connected in series between the first terminal and the second terminal of the first resonant circuit.

6. The radio frequency amplification device as described in claim 3, characterized in that, The second resonant component includes: A second capacitor; and A first inductor, wherein the first inductor and the second capacitor are connected in series between the first terminal and the second terminal of the first resonant circuit.

7. The radio frequency amplification device as described in claim 6, characterized in that, The first resonant circuit further includes: A third resonant component has a first terminal and a second terminal respectively coupled to the first terminal and the second terminal of the first resonant circuit, wherein the third resonant component includes: A third capacitor; and A second inductor, wherein the second inductor and the third capacitor are connected in series between the first terminal and the second terminal of the first resonant circuit.

8. The radio frequency amplification device as described in claim 1, characterized in that, The first resonant circuit includes: A resistor; A first capacitor, wherein the first capacitor and the resistor are connected in series between the first terminal and the second terminal of the first resonant circuit; A second capacitor; and An inductor, wherein the inductor and the second capacitor are connected in series between a first terminal and a second terminal of the first capacitor.

9. The radio frequency amplification device as claimed in claim 1, characterized in that, The first resonant circuit includes: A first capacitor is coupled between the first terminal of the first resonant circuit and a common node; A second capacitor; A first inductor, wherein the first inductor and the second capacitor are connected in series between the first terminal and the common node of the first resonant circuit; A third capacitor is coupled between the common node and the second terminal of the first resonant circuit; A fourth capacitor; and A second inductor, wherein the second inductor and the fourth capacitor are connected in series between the common node and the second terminal of the first resonant circuit.

10. The radio frequency amplification device as claimed in claim 1, characterized in that, Including: A third resonant circuit has a first terminal coupled to the input terminal of the first amplifier, wherein a second terminal of the third resonant circuit is coupled to a reference voltage terminal, the third resonant circuit being used to provide a high-impedance path between the first terminal and the second terminal of the third resonant circuit to the first frequency component, and to provide a low-impedance path between the first terminal and the second terminal of the third resonant circuit to the second frequency component.

11. The radio frequency amplification device as claimed in claim 1, characterized in that, Including: A fourth resonant circuit has a first terminal coupled to a reference terminal of the first amplifier, wherein a second terminal of the fourth resonant circuit is coupled to a reference voltage terminal, the fourth resonant circuit being used to provide a high-impedance path to a first frequency component between the first terminal and the second terminal of the fourth resonant circuit, and to provide a low-impedance path to a second frequency component between the first terminal and the second terminal of the fourth resonant circuit.

12. The radio frequency amplification device as claimed in claim 11, characterized in that, The fourth resonant circuit includes: A first inductor having a first terminal coupled to the first terminal of the fourth resonant circuit; A second inductor having a first terminal coupled to a second terminal of the first inductor, wherein the second terminal of the second inductor is coupled to the second terminal of the fourth resonant circuit; and A capacitor having a first terminal and a second terminal respectively coupled to the first terminal and the second terminal of the second inductor.

13. The radio frequency amplification device as claimed in claim 11, characterized in that, The fourth resonant circuit includes: A first inductor having a first terminal coupled to the first terminal of the fourth resonant circuit; A capacitor having a first terminal coupled to a second terminal of the first inductor; A second inductor having a first terminal coupled to a second terminal of the capacitor, wherein the second terminal of the second inductor is coupled to the second terminal of the fourth resonant circuit; and A third inductor has a first terminal and a second terminal respectively coupled to the first terminal of the capacitor and the second terminal of the second inductor.

14. The radio frequency amplification device as claimed in claim 11, characterized in that, The fourth resonant circuit includes: An inductor having a first terminal coupled to the first terminal of the fourth resonant circuit; A first capacitor having a first terminal coupled to a second terminal of the inductor, wherein the second terminal of the first capacitor is coupled to the second terminal of the fourth resonant circuit; and A second capacitor has a first terminal and a second terminal respectively coupled to the first terminal of the inductor and the second terminal of the first capacitor.

15. A radio frequency amplification device, characterized in that, include: A first amplifier has an input terminal adapted to be coupled to a signal providing terminal to input a first radio frequency signal, wherein the first amplifier is used to amplify a first frequency component of the first radio frequency signal and output it to an output terminal of the first amplifier. A first resonant circuit has a first terminal and a second terminal respectively coupled to the input terminal and the output terminal of a first amplifier, wherein the first resonant circuit is used to provide a first low-impedance path between the input terminal and the output terminal of the first amplifier to a second frequency component of the first radio frequency signal, and to provide a first high-impedance path between the input terminal and the output terminal of the first amplifier to the first frequency component of the first radio frequency signal; and A second resonant circuit has a first terminal coupled to the signal providing terminal to receive a second radio frequency signal, wherein a second terminal of the second resonant circuit is coupled to the input terminal of the first amplifier to provide the first radio frequency signal, the second resonant circuit is used to provide a second low-impedance path between the first terminal and the second terminal of the second resonant circuit to the first frequency component to generate the first radio frequency signal, and the second resonant circuit is used to provide a second high-impedance path between the first terminal and the second terminal of the second resonant circuit to a third frequency component of the second radio frequency signal.

16. The radio frequency amplification device as claimed in claim 15, characterized in that, The second resonant circuit includes: A first capacitor having a first end adapted to be coupled to the signal providing terminal, wherein a second end of the first capacitor is coupled to the input terminal of the first amplifier; A second capacitor; and A first inductor, wherein the first inductor and the second capacitor are connected in series between the first terminal and the second terminal of the first capacitor.

17. The radio frequency amplification device as claimed in claim 16, characterized in that, The second resonant circuit further includes: A third capacitor; and A second inductor, wherein the second inductor and the third capacitor are connected in series between the first terminal and the second terminal of the first capacitor.

18. The radio frequency amplification device as claimed in claim 15, characterized in that, The second resonant circuit includes: A resistor having a first end adapted to be coupled to the signal providing end; A first capacitor, wherein the first capacitor and the resistor are connected in series between the signal providing terminal and the input terminal of the first amplifier; A second capacitor; and An inductor, wherein the inductor and the second capacitor are connected in series between a first terminal and a second terminal of the first capacitor.

19. The radio frequency amplification device as claimed in claim 15, characterized in that, The second resonant circuit includes: A first capacitor is coupled between the signal providing terminal and a common node; A second capacitor; A first inductor, wherein the first inductor and the second capacitor are connected in series between the signal providing terminal and the common node; A third capacitor is coupled between the common node and the input terminal of the first amplifier; A fourth capacitor; and A second inductor, wherein the second inductor and the fourth capacitor are connected in series between the common node and the input terminal of the first amplifier.

20. The radio frequency amplification device as claimed in claim 15, characterized in that, The second resonant circuit includes: A capacitor having a first end adapted to be coupled to the signal providing terminal, wherein a second end of the capacitor is coupled to the input terminal of the first amplifier; and An inductor having a first end and a second end respectively coupled to the first end and the second end of the capacitor.

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