Low-noise-coefficient radio frequency power amplification circuit and radio frequency power supply biasing circuit
By using parallel and series combinations of inductors and capacitors in the RF power supply bias circuit to form a bandpass filter, the problem of high noise figure in the 1-20GHz frequency band of the RF power supply bias circuit is solved, and the stability of the power supply and the noise figure of the RF power amplifier are improved.
Patent Information
- Application Number
- CN202423227557.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-26
AI Technical Summary
Existing RF power supply bias circuits have a large noise figure in the 1-20GHz frequency band, which cannot effectively filter out noise and affects power supply stability and the performance of RF power amplifiers.
By using parallel combinations of inductors and capacitors, as well as series combinations of inductors and capacitors, a bandpass filter is formed, which enhances the filtering frequency range, reduces in-band insertion loss, suppresses power supply spike pulses, and improves power supply stability.
It effectively reduces in-band insertion loss, filters out noise, improves the noise figure of RF power amplifiers, and enhances power supply stability within the 1-20GHz frequency band.
Smart Images
Figure CN223652233U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to radio frequency power circuit technical field, concretely relates to a radio frequency power amplification circuit and radio frequency power supply bias circuit of low noise coefficient. BACKGROUND
[0002] Radio frequency power supply bias circuit has the advantages such as high -efficient filter, stable power supply, is widely used in power amplifier, and actual application will require: radio frequency power supply bias circuit has the functions such as reducing high frequency noise in power supply, improving the stability and ripple suppression ability of power supply, preventing the peak voltage in power supply, guaranteeing power supply stability.But in actual use, to meet the above functions, need to be based on filter circuit, voltage stabilizing circuit to realize, lead to the circuit volume proportion is big.Along with the requirement of circuit volume reduction, in actual use, to save the circuit volume, will remove the voltage stabilizing circuit or use specific filter frequency band circuit and so on mode to reduce the circuit volume.However, the current radio frequency power supply bias circuit design structure still has the problem that the noise coefficient of the corresponding working frequency band is greatly influenced. SUMMARY
[0003] The technical problem to be solved by the present application is to provide a radio frequency power amplification circuit and radio frequency power supply bias circuit with low noise coefficient, which can improve the stability of the power supply and reduce the noise coefficient of the radio frequency power amplifier.
[0004] In one embodiment, the radio frequency power amplification circuit with low noise coefficient comprises a radio frequency power amplifier U and a matching circuit thereof, wherein the matching circuit comprises a radio frequency signal input matching circuit, a radio frequency power supply bias circuit, a working voltage input matching circuit and a radio frequency signal output matching circuit.
[0005] The radio frequency power supply bias circuit comprises a first inductor L1, a second inductor L2, a first resistor R1, a second resistor R2 and a fifth non-polar capacitor C5; one end of the first resistor R1 is connected to the input end of the radio frequency power amplifier U, and the other end is connected to the radio frequency bias power supply VGG; one end of the first inductor L1 is connected to the radio frequency bias power supply VGG, and the other end is connected to one end of the second inductor L2 and one end of the second resistor R2 respectively; the other end of the second inductor L2 and the other end of the second resistor R2 are both connected to the ground through the fifth non-polar capacitor C5.
[0006] In one embodiment, the radio frequency signal input matching circuit comprises a first non-polar capacitor C1 and a second non-polar capacitor C2; one end of the first non-polar capacitor C1 is connected to the radio frequency signal input end IN, and the other end is connected to the input end of the radio frequency power amplifier U; one end of the second non-polar capacitor C2 is connected to the input end of the radio frequency power amplifier U, and the other end is connected to the ground.
[0007] In one embodiment, the working voltage input matching circuit includes a sixth non-polar capacitor C6 and a seventh non-polar capacitor C7, which are connected in parallel, and one end of the parallel circuit is connected to the output end of the radio frequency power amplifier U and the working power supply VCC of the radio frequency power amplifier U respectively, and the other end is grounded.
[0008] In one embodiment, the radio frequency signal output matching circuit includes a third non-polar capacitor C3 and a fourth non-polar capacitor C4, one end of the third non-polar capacitor C3 is connected to the output end of the radio frequency power amplifier U, and the other end is grounded; one end of the fourth non-polar capacitor C4 is connected to the radio frequency signal output end OUT, and the other end is connected to the output end of the radio frequency power amplifier U.
[0009] In one embodiment of the second aspect, a low-noise coefficient radio frequency power supply bias circuit is provided, which includes a first inductor L1, a second inductor L2, a first resistor R1, a second resistor R2, and a fifth non-polar capacitor C5; one end of the first resistor R1 is used to connect to the input end of the radio frequency power amplifier U, and the other end is used to connect to the radio frequency bias power supply VGG; one end of the first inductor L1 is used to connect to the radio frequency bias power supply VGG, and the other end is connected to one end of the second inductor L2 and one end of the second resistor R2 respectively; the other end of the second inductor L2 and the other end of the second resistor R2 are both used to connect to the ground through the fifth non-polar capacitor C5.
[0010] The beneficial effects of the utility model are:
[0011] In the radio frequency power supply bias circuit, the inductor and the capacitor in parallel combination series are increased, so that the filtering frequency band range can be obviously improved, the in-band insertion loss can be effectively reduced in the 1-20GHz frequency band range, the noise of 1-20GHz can be effectively filtered out, the power supply sharp peak pulse can be suppressed, the stability of the power supply can be effectively improved, and the noise coefficient of the radio frequency power amplifier is improved. BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 It is a traditional radio frequency power supply bias circuit structure schematic diagram;
[0013] Figure 2 It is a second traditional radio frequency power supply bias circuit structure schematic diagram;
[0014] Figure 3 It is a third traditional radio frequency power supply bias circuit structure schematic diagram;
[0015] Figure 4 It is a low-noise coefficient radio frequency power supply bias circuit structure schematic diagram of one embodiment of the application;
[0016] Figure 5 It is a low-noise coefficient radio frequency power supply bias circuit structure schematic diagram of one embodiment of the application; Figure 4The equivalent circuit structure schematic diagram of the circuit composed of the first inductor L1, the second inductor L2, the second resistor R2 and the fifth non-polar capacitor C5 is shown in the figure.
[0017] Figure 6 The low-noise coefficient radio frequency power amplification circuit structure schematic diagram of an embodiment of the application is shown in the figure.
[0018] In the figure, 01 is a radio frequency signal input matching circuit, 02 is a radio frequency power bias circuit, 03 is a working voltage input matching circuit, and 04 is a radio frequency signal output matching circuit. DETAILED DESCRIPTION
[0019] The utility model will be further described in detail through specific implementation modes combined with the drawings. In different implementation modes, similar elements are associated with similar element labels. In the following implementation modes, many details are described in order to make the application better understood. However, those skilled in the art can easily realize that part of the features can be omitted in different cases, or can be replaced by other elements, materials or methods. In some cases, some operations related to the application are not shown or described in the specification in order to avoid the core part of the application being overwhelmed by too much description, and it is not necessary to describe these related operations in detail for those skilled in the art according to the description in the specification and general technical knowledge in the art.
[0020] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate way to form various implementation modes. At the same time, the steps or actions in the method description can also be sequentially adjusted or adjusted in a manner that is obvious to those skilled in the art. Therefore, the order in the specification and the drawings is only for the purpose of clearly describing a certain embodiment, and does not mean that it is the necessary order, unless otherwise stated that a certain order must be followed.
[0021] The serial numbers of the components in this paper, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any order or technical meaning. Unless otherwise specified, "connection" and "coupling" in this application include direct and indirect connection (coupling).
[0022] In order to facilitate the description of the utility model concept of the application, the radio frequency power bias circuit is briefly described below.
[0023] Please refer to Figure 1 , Figure 1 It is a traditional radio frequency power bias circuit, Figure 1In the prior art, the radio frequency bias power supply VGG supplies power to the radio frequency power amplifier through a resistor and is grounded through an inductor. Figure 1 The circuit structure shown in the prior art has a large insertion loss at a working frequency in a 1-20 GHz frequency band range, and has a resonance at a working frequency of 18 GHz. The structure cannot be optimized by debugging to solve the problem, so that the noise cannot be completely filtered out at the working frequency of 18 GHz, and the noise figure of the power amplifier is affected.
[0024] Please refer to Figure 2 , Figure 2 The third conventional radio frequency power supply bias circuit is shown in FIG. 3. Figure 2 In the prior art, the radio frequency bias power supply VGG supplies power to the radio frequency power amplifier through a resistor and is grounded through an inductor. Figure 2 The circuit structure shown in the prior art has a large insertion loss at a working frequency in a 1-20 GHz frequency band range, and has a resonance at a working frequency of 18 GHz. The structure cannot be optimized by debugging to solve the problem, so that the noise cannot be completely filtered out at the working frequency of 18 GHz, and the noise figure of the power amplifier is affected.
[0025] Please refer to Figure 3 , Figure 3 The third conventional radio frequency power supply bias circuit is shown in FIG. 3. Figure 3 In the prior art, the radio frequency bias power supply VGG supplies power to the radio frequency power amplifier through a resistor and is grounded through an inductor. Figure 3 The radio frequency power supply bias circuit in the prior art has a filtering effect on most frequency bands in a 1-20 GHz frequency band range, but the noise in the resonance point frequency band cannot be filtered out, and the application of the radio frequency power amplifier will affect the noise figure of the corresponding frequency band.
[0026] In view of this, the present application provides a low-noise radio frequency power amplifier circuit and a radio frequency power supply bias circuit. In the radio frequency power supply bias circuit, an inductor and a capacitor are connected in parallel, and an inductor and a capacitor are connected in series with the parallel combination. This can significantly improve the filtering frequency band range, effectively reduce the in-band insertion loss in a 1-20 GHz frequency band range, and effectively filter out the noise in the 1-20 GHz frequency band, suppress the power spike pulse, effectively improve the stability of the power supply, and improve the noise figure of the radio frequency power amplifier.
[0027] For the convenience of understanding, the low-noise radio frequency power supply bias circuit will be described first.
[0028] Please refer to Figure 4The application provides a low-noise coefficient radio frequency power bias circuit, which comprises a first inductor L1, a second inductor L2, a first resistor R1, a second resistor R2 and a fifth non-polar capacitor C5. One end of the first resistor R1 is used for connecting the input end of a radio frequency power amplifier U, and the other end is used for connecting a radio frequency bias power supply VGG. One end of the first inductor L1 is used for connecting the radio frequency bias power supply VGG, and the other end is used for connecting one end of the second inductor L2 and one end of the second resistor R2 respectively. The other end of the second inductor L2 and the other end of the second resistor R2 are both used for connecting the ground through the fifth non-polar capacitor C5.
[0029] The applicant finds in research that for the parallel second resistor R2 and the second inductor L2, when the power supply is suddenly powered on, due to the instability of the power supply itself, the power supply will generate a large voltage and a large current. According to the law of electromagnetic induction, the second inductor L2 will generate a reverse induced electromotive force E (E=-α*(ΔI / Δt), wherein α represents the self-induction coefficient of the second inductor L2, Δt represents the instantaneous time difference, and ΔI represents the instantaneous current difference under the instantaneous time difference Δt) due to the self-induction phenomenon. The reverse induced electromotive force E will offset the sudden change of the current. The parallel second resistor R2 can provide a discharge path for the current in the inductor, and release the inductive voltage at both ends of the inductor in the form of heat.
[0030] Since the second resistor R2 in parallel with the second inductor L2 is a pure resistor, the second inductor L2 alone cannot provide filtering effect, and therefore the first inductor L1 and the fifth non-polar capacitor C5 in series are added to form a band-pass filter. The equivalent circuit of the circuit composed of the first inductor L1, the second inductor L2, the second resistor R2 and the fifth non-polar capacitor C5 can be referred to Figure 5 , wherein the first inductor L1 can be equivalent to a parallel inductor L33 and a non-polar capacitor C33, the second inductor L2 can be equivalent to a series inductor L22 and a non-polar capacitor C22, and the fifth non-polar capacitor can be equivalent to a parallel inductor L11 and a non-polar capacitor C11.
[0031] The independent second inductor L2 can only form a low-pass filter of a specific frequency, the fifth non-polar capacitor C5 is capacitive, and the impedance of the first inductor L1 is inductive. According to , wherein, inductance, C represents capacitance, then the first inductance L1 at 20GHz and the fifth non-polar capacitance C5 at 1GHz can be calculated to form a band-pass filter of 1-20GHz. Therefore, the fine tuning of the second inductance L2 can be matched, so as to fine tune the inductance L22 and the capacitance C22, reach the standing wave of 1GHz to 20GHz edge, and thus achieve the effect of expanding the filter bandwidth. Therefore, the radio frequency power supply bias circuit in the embodiment of the application can obviously improve the filter frequency range, and the in-band insertion loss is less than 1dB in the 1-20GHz frequency range, which can effectively filter out the noise of 1-20GHz, suppress the power peak pulse, effectively improve the stability of the power supply, and greatly improve the noise coefficient of the radio frequency power amplifier.
[0032] Please refer to Figure 6 The radio frequency power amplification circuit with low noise coefficient provided in the embodiment of the application comprises a radio frequency power amplifier U and a matching circuit thereof. The matching circuit comprises a radio frequency signal input matching circuit 01, a radio frequency power supply bias circuit 02, a working voltage input matching circuit 03, and a radio frequency signal output matching circuit.
[0033] The radio frequency power supply bias circuit 02 comprises a first inductance L1, a second inductance L2, a first resistance R1, a second resistance R2, and a fifth non-polar capacitance C5. One end of the first resistance R1 is connected to the input end of the radio frequency power amplifier U, and the other end is connected to the radio frequency bias power supply VGG. One end of the first inductance L1 is connected to the radio frequency bias power supply VGG, and the other end is connected to one end of the second inductance L2 and one end of the second resistance R2, respectively. The other end of the second inductance L2 and the other end of the second resistance R2 are both connected to the ground through the fifth non-polar capacitance C5.
[0034] The radio frequency power amplification circuit in the embodiment of the application can obviously improve the filter frequency range, and the in-band insertion loss is less than 1dB in the 1-20GHz frequency range, which can effectively filter out the noise of 1-20GHz, suppress the power peak pulse, effectively improve the stability of the power supply, and greatly improve the noise coefficient of the radio frequency power amplifier.
[0035] In one embodiment, the radio frequency signal input matching circuit 01 comprises a first non-polar capacitance C1 and a second non-polar capacitance C2. One end of the first non-polar capacitance C1 is connected to the radio frequency signal input end IN, and the other end is connected to the input end of the radio frequency power amplifier U. One end of the second non-polar capacitance C2 is connected to the input end of the radio frequency power amplifier U, and the other end is connected to the ground.
[0036] In one embodiment, the working voltage input matching circuit 03 comprises a sixth non-polar capacitor C6 and a seventh non-polar capacitor C7, which are connected in parallel, and one end of the parallel circuit is connected to the output end of the radio frequency power amplifier U and the working power supply VCC of the radio frequency power amplifier U respectively, and the other end is grounded.
[0037] In one embodiment, the radio frequency signal output matching circuit 04 comprises a third non-polar capacitor C3 and a fourth non-polar capacitor C4, one end of the third non-polar capacitor C3 is connected to the output end of the radio frequency power amplifier U, and the other end is grounded. One end of the fourth non-polar capacitor C4 is connected to the radio frequency signal output end OUT, and the other end is connected to the output end of the radio frequency power amplifier U.
[0038] The above uses specific examples to describe the utility model, which is only used to help understand the utility model and does not limit the utility model. For those skilled in the art to which the utility model belongs, according to the idea of the utility model, a number of simple deductions, deformations or substitutions can be made.
Claims
1. A radio frequency power amplifier circuit having a low noise figure, characterized by The radio frequency power amplifier U and a matching circuit thereof, the matching circuit comprising a radio frequency signal input matching circuit, a radio frequency power supply bias circuit, a working voltage input matching circuit and a radio frequency signal output matching circuit; The radio frequency power supply bias circuit comprises a first inductor L1, a second inductor L2, a first resistor R1, a second resistor R2 and a fifth non-polar capacitor C5; one end of the first resistor R1 is connected to the input end of the radio frequency power amplifier U, and the other end is connected to the radio frequency bias power supply VGG; one end of the first inductor L1 is connected to the radio frequency bias power supply VGG, and the other end is connected to one end of the second inductor L2 and one end of the second resistor R2 respectively; the other end of the second inductor L2 and the other end of the second resistor R2 are both connected to the ground through the fifth non-polar capacitor C5.
2. The low noise figure radio frequency power amplification circuit of claim 1, wherein, The radio frequency signal input matching circuit comprises a first non-polar capacitor C1 and a second non-polar capacitor C2; one end of the first non-polar capacitor C1 is connected to the radio frequency signal input end IN, and the other end is connected to the input end of the radio frequency power amplifier U; one end of the second non-polar capacitor C2 is connected to the input end of the radio frequency power amplifier U, and the other end is connected to the ground.
3. The low noise figure radio frequency power amplification circuit of claim 1, wherein, The working voltage input matching circuit comprises a sixth non-polar capacitor C6 and a seventh non-polar capacitor C7, the sixth non-polar capacitor C6 and the seventh non-polar capacitor C7 are connected in parallel, and one end of the parallel circuit is connected to the output end of the radio frequency power amplifier U and the working power supply VCC of the radio frequency power amplifier U respectively, and the other end is connected to the ground.
4. The low noise figure radio frequency power amplifier circuit of claim 1, wherein, The radio frequency signal output matching circuit comprises a third non-polar capacitor C3 and a fourth non-polar capacitor C4, one end of the third non-polar capacitor C3 is connected to the output end of the radio frequency power amplifier U, and the other end is connected to the ground; one end of the fourth non-polar capacitor C4 is connected to the radio frequency signal output end OUT, and the other end is connected to the output end of the radio frequency power amplifier U.
5. A low noise figure radio frequency power biasing circuit, characterized by, The radio frequency power amplifier U and a matching circuit thereof, the matching circuit comprising a radio frequency signal input matching circuit, a radio frequency power supply bias circuit, a working voltage input matching circuit and a radio frequency signal output matching circuit;