Tunable low-noise amplifier

Abstract

The utility model discloses a tunable low-noise amplifier, which comprises a low-noise amplifier unit used for carrying out low-noise amplification on a radio frequency receiving signal input by a signal input end RF IN and outputting the amplified signal from a signal output end RF OUT; and the adjustable power supply unit is used for providing the working voltage VCC of the low-noise amplifier unit and adjusting the magnitude of the voltage VCC so as to adjust the gain of the low-noise amplifier unit. According to the tunable low-noise amplifier disclosed by the utility model, the working voltage input size of the low-noise amplifier is adjusted by arranging the adjustable power supply unit, so that the gain for driving the low-noise amplifier is selected, the variable gain of the low-noise amplifier is realized, and a tunable amplification function of a radio frequency receiving signal is completed.

Description

TECHNICAL FIELD

[0001] The utility model relates to a low noise amplifier especially relates to a tunable low noise amplifier for removing foreign matter on the surface of workpiece. BACKGROUND

[0002] With the popularity of 5G communication mobile phones and other electronic devices, the radio frequency receiving performance requirements of electronic devices are becoming more and more stringent. In the process of improving the radio frequency receiving performance of electronic devices, the low noise amplifier (LNA) plays a crucial role. As part of the radio frequency receiving system, LNA is mainly used to amplify the received weak signal and reduce the introduction of noise as much as possible, thereby improving the signal-to-noise ratio and sensitivity of the receiving system.

[0003] LNA is mainly divided into two categories: GPIO-controlled Gain gain uncoordinated LNA and MIPI-controlled Gain gain coordinated LNA. The GPIO-controlled LNA is configured through the GPIO interface, but its gain is not coordinated, which means that a specific gain value cannot be selected. This design is relatively simple, but lacks flexibility, limiting its application in some application scenarios that require fine control of gain. The MIPI-controlled LNA adjusts the gain through the MIPI interface, supports a wider range of gain selection, and provides greater design flexibility. Although the MIPI-controlled LNA provides greater design flexibility, in actual application, every time the gain needs to be changed, it needs to be updated and changed through software modem configuration compilation, which is relatively complex to operate. In addition, compared with GPIO devices, MIPI devices have higher costs, increasing the cost of the device. SUMMARY

[0004] One of the purposes of the utility model is to provide a tunable low noise amplifier, which can drive the gain selection of the low noise amplifier by controlling the input size of the output voltage of the adjustable power supply unit.

[0005] In order to achieve the above purpose, the utility model provides a tunable low noise amplifier, comprising:

[0006] a low noise amplifier unit for low noise amplification of the radio frequency receiving signal input by the signal input end RF IN, and outputting the amplified signal from the signal output end RF OUT; and

[0007] an adjustable power supply unit for providing the working voltage VCC of the low noise amplifier unit and adjusting the size of the voltage VCC, thereby adjusting the gain of the low noise amplifier unit.

[0008] Furthermore, the adjustable power supply unit is defined as a voltage divider circuit, which is used to divide the input external power supply voltage VDD and send the voltage obtained after voltage division to the low noise amplifier unit as its operating voltage VCC.

[0009] Furthermore, the voltage divider circuit includes:

[0010] The first resistor R1, its first terminal is used to connect to the external power supply voltage VDD; and

[0011] The second resistor R2 has its first end connected to the second end of the first resistor R1, and its second end is grounded.

[0012] The connection between the first resistor R1 and the second resistor R2 is used for the output voltage VCC.

[0013] Furthermore, both the first resistor R1 and the second resistor R2 are variable resistors.

[0014] Furthermore, the relationship between the operating voltage VCC of the low-noise amplifier unit and the external supply voltage VDD is as follows:

[0015]

[0016] Furthermore, the low-noise amplifier unit includes:

[0017] Low-noise amplifier body (LNA);

[0018] A first DC isolation component is used to send the radio frequency received signal input at the signal input terminal RF IN to the input terminal of the low-noise amplifier body LNA, and to isolate the DC signal between the signal input terminal RF IN and the input terminal of the low-noise amplifier body LNA; and

[0019] The second DC isolation component is used to send the radio frequency signal output from the output terminal of the low noise amplifier body (LNA) to the signal output terminal (RF OUT), and to isolate the DC signal between the output terminal of the low noise amplifier body (LNA) and the signal output terminal (RF OUT).

[0020] Furthermore, the first DC isolation component is defined as a first DC blocking capacitor C1, the first end of which is electrically connected to the signal input terminal RF IN, and the second end of which is electrically connected to the input terminal of the low noise amplifier body LNA.

[0021] Furthermore, the second DC isolation component is defined as a second DC blocking capacitor C2, the first end of which is electrically connected to the output terminal of the low noise amplifier body LNA, and the second end of which is electrically connected to the signal output terminal RF OUT.

[0022] Furthermore, the low-noise amplifier unit also includes a voltage regulator component, which is used to regulate the power supply voltage sent from the adjustable power supply unit before sending it to the power supply terminal of the low-noise amplifier body LNA.

[0023] Furthermore, the voltage regulator component is defined as a first inductor L1, whose first end is electrically connected to the adjustable power supply unit, and whose second end is electrically connected to the power supply terminal of the low noise amplifier body LNA.

[0024] The tunable low-noise amplifier of this invention has the following advantages: by setting an adjustable power supply unit to adjust the working voltage input of the low-noise amplifier, the gain driving the low-noise amplifier can be selected, realizing the variable gain of the low-noise amplifier and completing the tunable amplification function of the radio frequency received signal; by using a voltage divider circuit for voltage regulation, and the first and second resistors of the voltage divider circuit are both variable resistors, it is easier to adjust the working voltage of the low-noise amplifier; the low-noise amplifier body uses a first inductor for voltage stabilization, which can avoid the drift of the working voltage of the noise amplifier causing the amplifier gain to be unstable. Attached Figure Description

[0025] Figure 1 This is a circuit diagram of one embodiment of the tunable low-noise amplifier of this utility model. Detailed Implementation

[0026] The tunable low-noise amplifier described in this utility model will be further explained below with reference to the accompanying drawings and specific embodiments. However, this explanation does not constitute an improper limitation on the technical solution of this utility model.

[0027] Please see Figure 1 , Figure 1 This is a circuit diagram of one embodiment of the tunable low-noise amplifier of this utility model. In this article, combined with... Figure 1 A tunable low-noise amplifier is illustrated by way of example to more clearly demonstrate the various components and their interrelationships. It should be understood that, although the following will... Figure 1 The specific embodiment shown is described in detail as an example, but it is not intended to limit the scope of the tunable low-noise amplifier of this invention. Apart from the components that solve the necessary technical problems of this invention (the low-noise amplifier unit 100 and the adjustable power supply unit 200 hereinafter), the other components can be regarded as non-essential technical elements. These non-essential technical elements can be replaced by other technical elements with the same or similar functions or structures in other embodiments, or these non-essential technical elements may not be needed in other embodiments.

[0028] Figure 1In the illustrated embodiment, the tunable low-noise amplifier includes a low-noise amplifier unit 100 and an adjustable power supply unit 200. The low-noise amplifier unit 100 amplifies the radio frequency received signal input at the signal input terminal RF IN with low noise and outputs the amplified signal from the signal output terminal RF OUT. The adjustable power supply unit 200 provides the operating voltage VCC of the low-noise amplifier unit 100 and adjusts the magnitude of the voltage VCC to adjust the gain of the low-noise amplifier unit 100.

[0029] The low-noise amplifier unit includes a low-noise amplifier body (LNA), a first DC isolation component, and a second DC isolation component. The first DC isolation component transmits the radio frequency received signal input at the signal input terminal RF IN to the input terminal of the low-noise amplifier body (LNA) and isolates the DC signal between the signal input terminal RF IN and the input terminal of the low-noise amplifier body (LNA). The first DC isolation component can be defined as a first DC blocking capacitor C1, with its first terminal electrically connected to the signal input terminal RF IN and its second terminal electrically connected to the input terminal of the low-noise amplifier body (LNA).

[0030] The second DC isolation component is used to send the radio frequency signal output from the output terminal of the low-noise amplifier (LNA) to the signal output terminal RF OUT, and to isolate the DC signal between the output terminal of the LNA and the signal output terminal RF OUT. The second DC isolation component can be defined as a second DC blocking capacitor C2, with its first terminal electrically connected to the output terminal of the LNA and its second terminal electrically connected to the signal output terminal RF OUT.

[0031] To prevent the operating voltage VCC supplied to the power supply terminal of the low-noise amplifier (LNA) from drifting and causing amplifier gain instability, the low-noise amplifier unit may further include a voltage regulator component for regulating the power supply voltage supplied by the adjustable power supply unit 200. The voltage regulator component may be defined as a first inductor L1, with its first terminal electrically connected to the adjustable power supply unit 200 and its second terminal electrically connected to the power supply terminal of the low-noise amplifier (LNA).

[0032] The adjustable power supply unit 200 can be defined as a voltage divider circuit, which is used to divide the input external power supply voltage VDD and send the voltage obtained after voltage division to the power supply terminal of the low noise amplifier body LNA as its operating voltage VCC.

[0033] The voltage divider circuit may include a first resistor R1 and a second resistor R2. The first terminal of the first resistor R1 is connected to the external power supply voltage VDD, and the second terminal is electrically connected to the first terminal of the first inductor L1, thereby connecting to the power supply terminal of the low-noise amplifier (LNA) via the first inductor L1. The first terminal of the second resistor R2 is connected to the second terminal of the first resistor R1, and the second terminal is grounded. The connection between the first resistor R1 and the second resistor R2 is used for the output voltage VCC. Both the first resistor R1 and the second resistor R2 can be variable resistors.

[0034] After powering the low-noise amplifier (LNA) using the voltage divider circuit described above, the operating voltage VCC can be changed by altering the resistance values ​​of the first resistor R1 and the second resistor R2, thus changing the operating voltage of the LNA and tuning the LNA gain to achieve different amplification effects on the received signal, all while keeping the external power supply voltage VDD constant.

[0035] The formula for calculating the voltage division in a voltage divider circuit is as follows:

[0036]

[0037] For example, when the resistance of the first resistor R1 is 20K and the resistance of the second resistor R2 is 80K, we can obtain VCC = 4 / 5VDD; that is, the operating voltage of the low noise amplifier body LNA is 4 / 5 of the external supply voltage. At this time, the gain of the low noise amplifier body LNA is 20dB.

[0038] When the resistance of the first resistor R1 is 40K and the resistance of the second resistor R2 is 60K, VCC = 3 / 5VDD can be obtained; that is, the operating voltage of the low noise amplifier body LNA is 3 / 5 of the external supply voltage. At this time, the gain of the low noise amplifier body LNA is 18dB.

[0039] When the resistance of the first resistor R1 is 100K and the resistance of the second resistor R2 is 100K, VCC = 1 / 2VDD can be obtained; that is, the operating voltage of the low noise amplifier body LNA is 1 / 2 of the external supply voltage. At this time, the gain of the low noise amplifier body LNA is 14dB.

[0040] When the resistance of the first resistor R1 is 100Ω and the resistance of the second resistor R2 is 50KΩ, VCC = 1 / 3VDD can be obtained; that is, the operating voltage of the low noise amplifier body LNA is 1 / 3 of the external supply voltage. At this time, the gain of the low noise amplifier body LNA is 12dB.

[0041] When the resistance of the first resistor R1 is 100K and the resistance of the second resistor R2 is 20K, VCC = 1 / 6VDD can be obtained; that is, the operating voltage of the low noise amplifier body LNA is 1 / 6 of the external power supply voltage. At this time, the gain of the low noise amplifier body LNA is 8dB.

[0042] Based on the above embodiments, the amplification process of the tunable low-noise amplifier of this utility model for the radio frequency received signal is as follows:

[0043] The external supply voltage VDD is divided by a voltage divider network consisting of the first resistor R1 and the second resistor R2 to obtain voltage VCC, which serves as the operating voltage of the low-noise amplifier (LNA). VCC can be adjusted to the voltage value corresponding to the desired gain by adjusting the resistance values ​​of the first resistor R1 and the second resistor R2. The first inductor L1 acts as a voltage regulator to prevent voltage VCC from drifting, which could lead to unstable amplification gain of the LNA.

[0044] After the radio frequency (RF) received signal is input at the signal input terminal RF IN, it passes through the first DC blocking capacitor C1 and enters the low-noise amplifier (LNA). The first DC blocking capacitor C1 filters out the DC component of the RF received signal to prevent the LNA from burning out. The LNA amplifies the RF received signal, and the amplification gain corresponds to the operating voltage VCC of the LNA. After amplification, the signal is sent to the signal output terminal RF OUT through the second DC blocking capacitor C2 (for reverse isolation), thus outputting the amplified RF received signal from the signal output terminal RF OUT.

[0045] In summary, the tunable low-noise amplifier of this invention has the following advantages: The adjustable power supply unit 200 allows for adjustment of the operating voltage VCC as needed, thereby adjusting the gain of the amplifier unit. Compared to the non-coordinated gain function of GPIO-controlled LNAs, this invention achieves coordinated gain. By using a voltage divider circuit to adjust the operating voltage VCC, the resistance values ​​of the first resistor R1 and the second resistor R2 can be flexibly changed as needed for tuning, avoiding software compilation waiting time and freeing the user from software constraints. Compared to the method of fixing the coordinateable gain range through software in MIPI-controlled coordinated gain LNAs, the solution in this embodiment, due to the more combinations of voltage divider circuits, allows for more detailed selection of the gain at corresponding points, resulting in better tuning performance. Furthermore, compared to existing GPIO and MIPI-controlled LNA devices, the solution in this embodiment eliminates the control pins for GPIO and MIPI, significantly reducing the cost of the amplifier.

[0046] It should be noted that the prior art portion of the protection scope of this utility model is not limited to the embodiments given in this application. All prior art that does not contradict the solution of this utility model, including but not limited to prior patent documents, prior publications, prior public uses, etc., can be included in the protection scope of this utility model.

[0047] Furthermore, the combination of the technical features in this case is not limited to the combination methods described in the claims of this case or the combination methods described in the specific embodiments. All technical features described in this case can be freely combined or combined in any way, unless they contradict each other.

[0048] It should also be noted that the embodiments listed above are merely specific embodiments of this utility model. Obviously, this utility model is not limited to the above embodiments, and similar changes or modifications made thereto are those that can be directly derived or easily conceived by those skilled in the art from the content disclosed in this utility model, and should all fall within the protection scope of this utility model.

Claims

1. A tunable low-noise amplifier, characterized in that, include: The low-noise amplifier unit is used to amplify the radio frequency received signal input at the signal input terminal RF IN with low noise and output the amplified signal from the signal output terminal RF OUT. as well as An adjustable power supply unit is used to provide the operating voltage VCC of the low-noise amplifier unit and to adjust the magnitude of the voltage VCC, thereby adjusting the gain of the low-noise amplifier unit. The adjustable power supply unit is defined as a voltage divider circuit, which is used to divide the input external power supply voltage VDD and send the voltage obtained after voltage division to the low noise amplifier unit as its operating voltage VCC.

2. The tunable low-noise amplifier as described in claim 1, characterized in that, The voltage divider circuit includes: The first resistor R1, its first terminal is used to connect to the external power supply voltage VDD; and The second resistor R2 has its first end connected to the second end of the first resistor R1, and its second end is grounded. The connection between the first resistor R1 and the second resistor R2 is used for the output voltage VCC.

3. The tunable low-noise amplifier as described in claim 2, characterized in that, Both the first resistor R1 and the second resistor R2 are variable resistors.

4. The tunable low-noise amplifier as described in claim 2, characterized in that, The relationship between the operating voltage VCC of the low-noise amplifier unit and the external power supply voltage VDD is as follows:

5. The tunable low-noise amplifier as described in any one of claims 1-4, characterized in that, The amplifier unit includes: Low-noise amplifier body (LNA); A first DC isolation component is used to send the radio frequency received signal input at the signal input terminal RF IN to the input terminal of the low-noise amplifier body LNA, and to isolate the DC signal between the signal input terminal RF IN and the input terminal of the low-noise amplifier body LNA; and The second DC isolation component is used to send the radio frequency signal output from the output terminal of the low noise amplifier body (LNA) to the signal output terminal (RF OUT), and to isolate the DC signal between the output terminal of the low noise amplifier body (LNA) and the signal output terminal (RF OUT).

6. The tunable low-noise amplifier as described in claim 5, characterized in that, The first DC isolation component is defined as a first DC blocking capacitor C1, the first end of which is electrically connected to the signal input terminal RF IN, and the second end of which is electrically connected to the input terminal of the low noise amplifier body LNA.

7. The tunable low-noise amplifier as described in claim 6, characterized in that, The second DC isolation component is defined as a second DC blocking capacitor C2, the first end of which is electrically connected to the output terminal of the low noise amplifier body LNA, and the second end of which is electrically connected to the signal output terminal RF OUT.

8. The tunable low-noise amplifier as described in claim 5, characterized in that, The amplifier unit includes a voltage regulator component, which is used to regulate the power supply voltage from the adjustable power supply unit before sending it to the power supply terminal of the low-noise amplifier body (LNA).

9. The tunable low-noise amplifier as described in claim 8, characterized in that, The voltage regulator component is defined as a first inductor L1, with its first end electrically connected to the adjustable power supply unit and its second end electrically connected to the power supply terminal of the low noise amplifier body LNA.

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