Miniaturized low-noise amplifier

Abstract

The utility model discloses a miniaturized low-noise amplifier, which belongs to the technical field of signal processing, and comprises a shell, a PCB (printed circuit board) is arranged in the shell, and an amplitude limiter, a first amplifier, a first attenuator, a second amplifier and a second attenuator are arranged on the PCB, so that the technical problems of reducing the volume of the low-noise amplifier and improving the reliability are solved. According to the utility model, the size of the device is greatly reduced, the difficulty in mounting and dismounting the device is reduced, the use scene of the device is expanded, the amplitude limiter is added in the circuit, the device is protected, the deterioration of the noise coefficient can be controlled in an extremely low range, the limitation of indexes is not exceeded, two attenuator networks are reserved as debugging nodes, and the debugging efficiency is improved. The debugging difficulty of engineers is reduced, and the output rate of equipment is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of signal processing, and in particular relates to a miniaturized low-noise amplifier. Background Art

[0002] The convenience of modern life is largely based on a complete and stable communication system, and the RF transceiver is the core part of the communication system. As the core circuit block in the RF front-end circuit, the RF transceiver mainly receives baseband signals and signals to be transmitted by the transmitting terminal. In the signal receiving link, the low-noise amplifier located under the antenna is an inconspicuous but very critical circuit component.

[0003] In communication systems, low-noise amplifiers are usually used to preliminarily amplify weak signals received by antennas. To obtain the best communication quality (obtain the lowest noise factor), the antenna and low-noise amplifier are usually installed close to each other. In some application scenarios, higher requirements are placed on the size and installation method of the low-noise amplifier. Therefore, RF engineers have been committed to developing smaller, wider frequency range, and more reliable low-noise amplifiers.

[0004] The existing technology has the following shortcomings:

[0005] 1. The equipment is large

[0006] Since low-noise amplifiers are usually developed as independent modules, power supply interfaces, RF input and output interfaces, and mounting holes must be reserved at appropriate locations outside the box. Secondly, under current scientific and technological conditions, the integration of RF amplifier chips is not high. To ensure the equipment specifications, debugging space must be reserved in the internal circuit. These factors make it difficult to compress the size of the equipment.

[0007] 2. The operating frequency band is narrow

[0008] Due to the limitation of RF amplifier physical characteristics and cost requirements, the operating frequency range of low noise amplifier is usually not very wide. In a wide operating frequency range, ensuring good noise figure, gain amplitude-frequency and standing wave index is a great challenge for designers.

[0009] 3. Poor reliability

[0010] Since low-noise amplifiers are precision devices that amplify tiny signals, their installation locations are usually subject to a lot of external interference. Instability in the power supply voltage and sudden excessive input signals may cause device damage. Therefore, how to provide adequate protection for the amplifier within a limited size is a difficult problem that plagues engineers. Utility Model Content

[0011] The utility model aims to provide a miniaturized low noise amplifier, which solves the technical problems of reducing the volume of the low noise amplifier and improving the reliability.

[0012] To achieve the above object, the utility model adopts the following technical scheme: a miniaturized low-noise amplifier, comprising a housing, a PCB board is arranged in the housing, an input interface, an output interface and a power interface are arranged on the front of the housing, the input interface and the output interface are arranged in an "eight" shape, and the power interface is arranged between the input interface and the output interface;

[0013] The PCB board is provided with a limiter, a first amplifier, a first attenuator, a second amplifier and a second attenuator, the input interface, the limiter and the first amplifier are arranged in sequence and spaced in the horizontal direction, the first amplifier, the first attenuator and the second amplifier are arranged in sequence and spaced in the vertical direction, the output interface, the second attenuator and the second amplifier are arranged in sequence and spaced in the horizontal direction, the power interface and the power supply circuit are arranged in sequence and spaced in the horizontal direction; the power supply circuit is arranged between the limiter and the second attenuator;

[0014] The input interface is connected to the limiter, the limiter is connected to the first amplifier, the first amplifier is connected to the first attenuator, the first attenuator is connected to the second amplifier, the second amplifier is connected to the second attenuator, and the power supply circuit supplies power to the limiter, the first amplifier, the first attenuator, the second amplifier and the second attenuator.

[0015] Preferably, the input interface is electrically connected to the limiter via a wire, and the output interface is electrically connected to the second attenuator via a wire.

[0016] Preferably, the shell is provided with windows corresponding to the input interface, the output interface and the power interface respectively, and the end of the input interface, the end of the output interface and the end of the power interface respectively extend into the shell through the corresponding windows and are all connected to the PCB board.

[0017] Preferably, the housing is an aluminum housing.

[0018] Preferably, the power supply circuit is connected to an external DC power supply via a power supply interface, and outputs the operating voltage required by the limiter, the first amplifier, the first attenuator, the second amplifier and the second attenuator.

[0019] Preferably, the power interface is also provided with a grounding welding plate and a through-hole capacitor.

[0020] A miniaturized low-noise amplifier described in the utility model solves the technical problems of reducing the volume of the low-noise amplifier and improving reliability. The utility model greatly reduces the volume of the device, reduces the difficulty of installing and disassembling the device, expands the use scenarios of the device, adds a limiter to the circuit, provides protection for the device, and can control the deterioration of the noise coefficient to an extremely low range without exceeding the limit of the indicator. Two attenuator networks are reserved as debugging nodes, which reduces the debugging difficulty of engineers and improves the output rate of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic block diagram of the PCB of the utility model;

[0022] Figure 2 It is a schematic top view of the utility model;

[0023] Figure 3 It is a schematic front view of the utility model;

[0024] In the figure: housing 1, PCB 2, input interface 3, power interface 4, output interface 5, grounding solder piece 6, and through-hole capacitor 7. DETAILED DESCRIPTION

[0025] Depend on Figure 1-Figure 3 A miniaturized low noise amplifier is shown, comprising a housing 1, a PCB 2 is arranged inside the housing 1, an input interface 3, an output interface 5 and a power interface 4 are arranged on the front of the housing 1, the input interface 3 and the output interface 5 are arranged in an "eight" shape, and the power interface 4 is arranged between the input interface 3 and the output interface 5;

[0026] The shell is provided with windows corresponding to the input interface 3, the output interface 5 and the power interface 4 respectively. The end of the input interface 3, the end of the output interface 5 and the end of the power interface 4 respectively extend into the shell 1 through the corresponding windows and are all connected to the PCB2 board. The shell 1 is an aluminum shell, and the shell 1 is an aluminum cuboid with a hollow interior.

[0027] A limiter, a first amplifier, a first attenuator, a second amplifier and a second attenuator are arranged on the PCB2 board; the input interface 3, the limiter and the first amplifier are arranged in sequence and spaced in the horizontal direction; the first amplifier, the first attenuator and the second amplifier are arranged in sequence and spaced in the vertical direction; the output interface 5, the second attenuator and the second amplifier are arranged in sequence and spaced in the horizontal direction; the power interface 4 and the power supply circuit are arranged in sequence and spaced in the horizontal direction; the power supply circuit is arranged between the limiter and the second attenuator;

[0028] The power supply circuit is connected to an external DC power supply via a power interface 4 and outputs the operating voltages required by the limiter, the first amplifier, the first attenuator, the second amplifier and the second attenuator. The power interface 4 is also provided with a grounding welding piece 6 and a through-hole capacitor 7.

[0029] The input interface 3 is connected to the limiter, the limiter is connected to the first amplifier, the first amplifier is connected to the first attenuator, the first attenuator is connected to the second amplifier, the second amplifier is connected to the second attenuator, and the power supply circuit supplies power to the limiter, the first amplifier, the first attenuator, the second amplifier and the second attenuator.

[0030] The input interface 3 is electrically connected to the limiter through a wire, and the output interface 5 is electrically connected to the second attenuator through a wire.

[0031] The external RF signal enters the miniaturized low-noise amplifier through the input interface 3 of the device. The signal first passes through the limiter, which is designed as a protective circuit to prevent the input signal from being too large and causing damage to the amplifier. The signal enters the first amplifier for preliminary voltage amplification. The first amplifier is responsible for increasing the amplitude of the input signal to enhance the signal strength. The amplified signal passes through the first attenuator, which can be used to adjust the amplitude of the signal or prevent excessive attenuation. The signal after the first attenuation enters the second amplifier for further voltage amplification. The second amplifier continues to increase the amplitude of the signal to enhance the amplification effect. The amplified signal passes through the second attenuator, which is used to further adjust the amplitude of the output signal or match the output requirements of the device. The amplified and adjusted signal is finally transmitted through the output interface 5 of the device. The power supply circuit of the entire amplifier module is connected to an external DC power supply to provide the necessary working voltage for the limiter, the two-stage amplifier, and the two-stage attenuator. Through the above steps, the miniaturized low-noise amplifier amplifies and adjusts the input signal and outputs an optimized signal to improve the performance of the communication system.

[0032] In this embodiment, the first attenuator and the second attenuator also provide nodes for adjusting standing waves and gain for the power amplifier.

[0033] Under the premise of meeting the interface requirements of the equipment index, the power supply interface of the utility model adopts a combination of a through-hole capacitor 7 + a grounding plate, which reduces the requirements for external power supply while providing DC filtering. Only a grounding wire and a DC wire are required to power the equipment. The interface is arranged in an "eight" shape to minimize the overall size of the equipment. The RF input and output interface 5 and the power supply interface are placed side by side on the same side, and the installation method is more flexible.

[0034] In this embodiment, the volume of the housing 1 can be reduced to 30*18*10 (length*width*thickness in mm), which is only the size of a thumb and is very small.

[0035] In this embodiment, the limiter can be HMC6300, LTC5507, ADL6010 or other limiters, which are responsible for protecting the RF input and preventing excessive signals from damaging subsequent amplifiers. The first amplifier and the second amplifier can both be ADL5545, LNA4ALL, MGA-86576 or other amplifiers. The user can select an amplifier with suitable gain, noise figure and operating frequency range according to design requirements. The first attenuator and the second attenuator can both be JFW Industries50FHM-XXX-10 or other amplifiers, which are used to adjust the amplitude of the signal and match the signal level between different amplification levels. The power supply circuit is selected according to the power supply voltage required by the limiter, the first amplifier, the first attenuator, the second amplifier and the second attenuator. A DC-DC module or a linear regulator, a switching regulator, an adjustable power supply module or a switching power supply module or other power supply modules can be used, such as LM317, LM7805, LM2576, LM2596, LM317T linear, LM2577 boost, LM2596 buck, etc.

[0036] Sample debugging stage: The core indicator of this embodiment is the output power within the working frequency band. The gain and standing wave of the equipment are adjusted by adjusting the static current of the power tube, the matching network and the attenuator, and a vector network analyzer is connected at the output end for testing.

[0037] A miniaturized low-noise amplifier described in the utility model solves the technical problems of reducing the volume of the low-noise amplifier and improving reliability. The utility model greatly reduces the volume of the device, reduces the difficulty of installing and disassembling the device, expands the use scenarios of the device, adds a limiter to the circuit, provides protection for the device, and can control the deterioration of the noise coefficient to an extremely low range without exceeding the limit of the indicator. Two attenuator networks are reserved as debugging nodes, which reduces the debugging difficulty of engineers and improves the output rate of the equipment.

Claims

1. A miniaturized low noise amplifier, characterized in that: The invention comprises a housing (1), a PCB (2) being arranged inside the housing (1), an input interface (3), an output interface (5) and a power interface (4) being arranged on the front side of the housing (1), the input interface (3) and the output interface (5) being arranged in an "eight" shape, and the power interface (4) being arranged between the input interface (3) and the output interface (5); A limiter, a first amplifier, a first attenuator, a second amplifier and a second attenuator are provided on the PCB (2); the input interface (3), the limiter and the first amplifier are arranged in sequence and spaced apart in the horizontal direction; the first amplifier, the first attenuator and the second amplifier are arranged in sequence and spaced apart in the vertical direction; the output interface (5), the second attenuator and the second amplifier are arranged in sequence and spaced apart in the horizontal direction; the power interface (4) and the power supply circuit are arranged in sequence and spaced apart in the horizontal direction; and the power supply circuit is arranged between the limiter and the second attenuator; The input interface (3) is connected to the limiter, the limiter is connected to the first amplifier, the first amplifier is connected to the first attenuator, the first attenuator is connected to the second amplifier, the second amplifier is connected to the second attenuator, and the power supply circuit supplies power to the limiter, the first amplifier, the first attenuator, the second amplifier and the second attenuator.

2. A miniaturized low noise amplifier as claimed in claim 1, characterized in that: The input interface (3) is electrically connected to the limiter via a wire, and the output interface (5) is electrically connected to the second attenuator via a wire.

3. A miniaturized low noise amplifier as claimed in claim 2, characterized in that: The shell is provided with windows corresponding to the input interface (3), the output interface (5) and the power interface (4), respectively; the end of the input interface (3), the end of the output interface (5) and the end of the power interface (4) respectively extend into the shell (1) through the corresponding windows and are all connected to the PCB (2).

4. A miniaturized low noise amplifier as claimed in claim 1, characterized in that: The housing (1) is an aluminum housing.

5. A miniaturized low noise amplifier as claimed in claim 1, characterized in that: The power supply circuit is connected to an external direct current power supply via a power supply interface (4), and outputs the operating voltage required by the limiter, the first amplifier, the first attenuator, the second amplifier and the second attenuator.

6. A miniaturized low noise amplifier as claimed in claim 1, characterized in that: The power interface (4) is also provided with a grounding welding piece (6) and a through-hole capacitor (7).

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