CN220234662U

CN220234662U - Low-power-consumption miniaturized L-band frequency synthesizer

Info

Publication number: CN220234662U
Application number: CN202321824767.7U
Authority: CN
Inventors: 李亚波
Original assignee: Shaanxi Boya Microwave Co ltd
Current assignee: Shaanxi Boya Microwave Co ltd
Priority date: 2023-07-12
Filing date: 2023-07-12
Publication date: 2023-12-22
Anticipated expiration: 2033-07-12

Abstract

The utility model discloses a low-power-consumption miniaturized L-band frequency synthesizer, which comprises a power supply (1), a frequency synthesizer (2), an MCU (micro control unit) (3), a crystal oscillator (4) and a turning piece (5), wherein the output end of the power supply (1) is respectively connected with the frequency synthesizer (2), the MCU (3), the crystal oscillator (4) and the turning piece (5), the output end of the crystal oscillator (4) is respectively connected with the frequency synthesizer (2) and the MCU (3), the output end of the MCU (3) is connected with the frequency synthesizer (2), the output end of the turning piece (5) is connected with the MCU (3), the input end of the turning piece (5) receives a control signal, the output end of the frequency synthesizer (2) outputs L-band frequency, and the power supply (1) and the turning piece (5) are respectively externally connected with a power supply.

Description

Low-power-consumption miniaturized L-band frequency synthesizer

Technical Field

The utility model belongs to the technical field of power supply equipment, and particularly relates to a low-power-consumption miniaturized L-band frequency synthesizer.

Background

Frequency synthesizers are an important component of modern electronic systems and are widely used in many fields such as communications, radar, electronic countermeasure, remote sensing telemetry, instrumentation, and the like. In a radio communication system, the frequency synthesizer is the core component of the radio frequency transceiver system. With the development of electronic information technology, miniaturization of electronic systems is a necessary development trend, and miniaturization of frequency synthesizers is an important link for realizing miniaturization of the whole electronic system.

Since the first proposal of the concept of frequency synthesizers, the prior art forms three frequency synthesis methods: 1. direct frequency synthesis; 2. phase-locked frequency synthesis; 3. direct digital frequency synthesis (DDS); the three frequency synthesis modes have different characteristics and different application fields. The direct frequency synthesis has good phase noise performance and is generally applied to ground radar and radio frequency microwave test equipment; in other fields, mainly using a DDS and phase-locked frequency synthesis mode, since the DDS operating frequency is limited by the clock frequency and the digital-to-analog converter operating speed, the phase-locked frequency synthesis technology is used in the wave band above millimeter wave.

In recent years, along with the increasing demands of people on high-capacity high-speed wireless service and high-precision positioning and identification, the modern wireless communication, radar and electronic warfare systems require smaller and smaller power consumption and smaller volume of a frequency synthesizer, but the existing L-band frequency synthesizer has a plurality of defects in technical and use aspects, 1, the volume is large, along with the development of scientific technology, the installation volume space of the frequency synthesizer is smaller and smaller, but the volume of the frequency synthesizer used in a flowing way is generally larger; 2. the frequency synthesizer is a complex device with large power consumption, and more electronic components are used.

Therefore, there is a need for a small L-band frequency synthesizer with low power consumption.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide a low-power-consumption miniaturized L-band frequency synthesizer.

In order to solve the technical problems, the technical scheme of the utility model is as follows: the utility model provides a miniaturized L wave band frequency synthesizer of low-power consumption, includes power, frequency synthesizer, MCU, crystal oscillator and commentaries on classics tablet, and frequency synthesizer, MCU, crystal oscillator and commentaries on classics tablet are connected respectively to the output of power, and frequency synthesizer and MCU are connected respectively to the output of crystal oscillator, and frequency synthesizer is connected to MCU's output, and MCU is connected to commentaries on classics tablet's output, and control signal is received to commentaries on classics tablet's input, and frequency synthesizer's output L wave band frequency, power and commentaries on classics tablet external power supply respectively.

Preferably, the power supply, the frequency synthesizer, the MCU, the crystal oscillator and the transfer chip are mounted in the printed board, the printed board is formed by pressing four layers of boards, the printed board comprises a top signal layer, a middle power layer, a middle stratum and a bottom signal layer, the frequency synthesizer, the MCU, the crystal oscillator and the transfer chip are mounted in the top signal layer, the power supply is mounted in the bottom signal layer, and the power supply passes through the middle power layer and the middle stratum to be respectively electrically connected with the frequency synthesizer, the MCU, the crystal oscillator and the transfer chip.

Preferably, the printed board is square board of four corners indent, and the isolation cell body has been seted up to the inwards extension of square board's one side, and the isolation cell body divide into integrated circuit part and output signal part with the printed board, and frequency synthesizer, MCU, crystal oscillator and commentaries on classics tablet subsides dress are in the integrated circuit part of printed board top layer signal layer, and the power is pasted and is adorned in the integrated circuit part of printed board bottom layer signal layer, the output signal part subsides of printed board top layer signal layer is equipped with the low pass filter spare, and the output of frequency synthesizer is connected back output L wave band frequency with low pass filter spare electricity.

Preferably, the isolation groove body is of an L-shaped structure.

Preferably, the printed board is installed in the synthesizer shell, the synthesizer shell comprises two square shells, the four corners of the two square shells are fixedly connected through screws, the printed board installation groove is formed in the opposite end face of the two square shells, the printed board installation groove is matched with the appearance of the printed board, a protruding isolation wall is arranged in the printed board installation groove, the protruding isolation wall is limited in the isolation groove, an input interface is formed in one end of the synthesizer shell, a signal output interface is formed in the other end of the synthesizer shell, a control signal wiring penetrates through the input interface to be connected with a transfer sheet, an external power supply wiring penetrates through the input interface to be connected with a power supply and the transfer sheet, and the frequency synthesizer is connected with a low-pass filter piece and then is connected with a wiring to output L-band frequency outwards through the signal output interface.

Preferably, LD, D0, D1, D2, D3, D4, D5, D6, GND and 5v connection points are respectively attached to one side of the integrated circuit portion of the printed board far away from the output signal portion, the 5v connection points pass through the input interface to be externally connected with a power supply, the 5v connection points are respectively connected with the power supply and the conversion tablet, the D0, D1, D2, D3, D4, D5, D6 connection points pass through the input interface to be externally connected with the control device, the D0, D1, D2, D3, D4, D5, D6 connection points are respectively connected with the conversion tablet, the LD connection points pass through the input interface to be externally connected with the test device, the LD connection points are also connected with the MCU, the other side of the integrated circuit portion is also attached with a socket JP1, the socket JP1 is externally connected with a computer, and the socket JP1 is also connected with the MCU.

Preferably, the low-pass filter comprises a low-pass filter U7 and an OUT wiring point, the input end of the low-pass filter U7 is connected with the frequency synthesizer, the output end of the low-pass filter U7 is connected with the OUT wiring point, and the OUT wiring point is used for outputting L-band frequency outwards through the signal output interface.

Preferably, the power supply includes a low dropout linear regulator U1, a low dropout linear regulator U3, a low dropout linear regulator U4, a 5V connection point is connected to the 1 pin of the low dropout linear regulator U1, the low dropout linear regulator U3, the low dropout linear regulator U4, the 5V connection point is externally connected to the power supply VSUPPLY, the 5 pin output voltage AVDD of the low dropout linear regulator U1, the 5 pin output voltage +3.3v of the low dropout linear regulator U3, and the 5 pin output voltage VVCO of the low dropout linear regulator U4.

Preferably, the frequency synthesizer comprises a chip U2, the MCU comprises a chip U5, and the transfer tablet comprises a chip U6;

the crystal oscillator comprises a chip X1, a resistor R37, a resistor R38 and a resistor R39, wherein the 4 pin of the chip X1 is connected with a voltage AVDD, the 3 pin of the chip X1 is connected with the resistor R37, the resistor R37 is respectively connected with the resistor R38 and the resistor R39, the resistor R38 is connected with the 29 pin of the chip U2 of the frequency synthesizer, and the resistor R39 is connected with the 2 pin of the chip U5 of the MCU;

pins 1, 2, 3 and 4 of the frequency synthesizer chip U2 are sequentially connected with pins 12, 14, 8 and 11 of a chip U5 of the MCU, pins 28 and 32 of the chip U2 are connected with voltage +3.3V, pin 26 of the chip U2 is connected with voltage AVDD, pins 13 and 16 of the chip U2 are connected with voltage VVCO, and pin 12 of the chip U2 is connected with output L-band frequency RFOUTAA;

the 1, 4 pins of the MCU chip U5 are connected with voltage +3.3V, the 15, 16, 17, 30, 31, 32, 33 and 34 pins of the chip U5 are sequentially connected with the 21, 20, 19, 18, 17, 16, 15 and 14 pins of the tablet chip U6, the 28 pins of the chip U5 are connected with the socket JP1, and the 20 and 24 pins of the chip U5 are connected with the LD wiring points;

the 1, 2, 22 external power supply VSUPPLY of the chip U6 of the transfer tablet, 23, 24 pin connection voltage +3.3V of chip U6, 3, 4, 5, 6, 7, 8, 9 pin connection D0, D1, D2, D3, D4, D5, D6 wiring point of chip U6 sequentially.

Compared with the prior art, the utility model has the advantages that:

(1) The utility model discloses a low-power-consumption miniaturized L-band frequency synthesizer, which comprises a power supply, a frequency synthesizer, an MCU, a crystal oscillator and a converting sheet, wherein after the power supply is externally powered by 5V, the converting sheet generates corresponding working voltages required by all devices through a low-dropout linear voltage stabilizer, the converting sheet converts an input 5V frequency control signal to 3.3V and sends the 3V to the MCU for frequency control, the L-band frequency change generated by the MCU is transmitted to the frequency synthesizer, the crystal oscillator generates stable and reliable clock frequency for the frequency synthesizer and the MCU, and the frequency synthesizer generates corresponding frequency synthesis after the power supply is powered by the power supply according to the requirements;

(2) According to the utility model, clock signals generated by the crystal oscillator are distributed through the resistors R37, R38 and R39, so that the number of the crystal oscillator is reduced, the clock frequency is reduced, the working frequency of a device is reduced, and the power consumption is reduced;

(3) The power supply, the frequency synthesizer, the MCU, the crystal oscillator and the transfer tablet are mounted in the printed board, the printed board is formed by pressing four layers of boards, the frequency synthesizer, the MCU, the crystal oscillator and the transfer tablet are mounted in the top layer signal layer, and the power supply is mounted in the bottom layer signal layer, so that the power supply can be manufactured into a small-volume synthesizer;

(4) The printed board is provided with the L-shaped structure isolation groove body, the protruding isolation wall is arranged in the printed board installation groove of the synthesizer shell, and the protruding isolation wall is limited in the isolation groove body during installation, so that physical isolation is arranged between the integrated circuit part and the output signal part, interference signals are isolated, useful signals are normally transmitted, an interference coupling channel is cut off, the purpose of inhibiting interference is achieved, and the output reliability and stability of the frequency synthesizer are ensured;

(5) The low-pass filter is attached to the output signal part, namely a low-pass filter is added, and only signals lower than 1325MHz are allowed to pass through by adopting a filtering method, so that the interference is reduced, and the output reliability and stability of the synthesizer are improved;

(6) The L-band frequency synthesizer of the utility model supplies 5V voltage, current is less than 300mA, power consumption is 1.5w, power consumption is low, and external dimension isThe volume is small, and the electronic components are all domestic.

Drawings

Fig. 1 is a schematic block diagram of a low-power miniaturized L-band frequency synthesizer according to the present utility model;

fig. 2 is a power circuit diagram of a miniaturized L-band frequency synthesizer with low power consumption according to the present utility model;

FIG. 3 is a diagram of a crystal oscillator circuit of a low-power miniaturized L-band frequency synthesizer according to the present utility model;

FIG. 4 is a circuit diagram of a frequency synthesizer of a low power miniaturized L-band frequency synthesizer of the present utility model;

fig. 5 is a circuit diagram of a low-power miniaturized L-band frequency synthesizer of the present utility model;

FIG. 6 is a circuit diagram of an MCU of a low-power miniaturized L-band frequency synthesizer according to the present utility model;

fig. 7 is a schematic diagram of the front structure of a printed board of a miniaturized L-band frequency synthesizer with low power consumption according to the present utility model

Fig. 8 is a schematic diagram of the reverse structure of a printed board of a low-power miniaturized L-band frequency synthesizer according to the present utility model;

fig. 9 is a schematic diagram of the external structure of a synthesizer housing of a low-power miniaturized L-band frequency synthesizer according to the present utility model;

fig. 10 is a schematic diagram of the internal structure of a synthesizer housing of a low power miniaturized L-band frequency synthesizer according to the present utility model.

Reference numerals illustrate:

1. the power supply, 2, the frequency synthesizer, 3, MCU,4, crystal oscillator, 5, the turning piece, 6, the printed board, 7, the synthesizer shell, 8, the low-pass filter, 9, the isolation cell body;

6-1, an integrated circuit part, 6-2, an output signal part;

7-1, square shell, 7-2, input interface, 7-3, signal output interface;

7-1-1, a printed board mounting groove, 7-1-2 and a convex partition wall.

Detailed Description

The following describes specific embodiments of the present utility model with reference to examples:

it should be noted that the structures, proportions, sizes and the like illustrated in the present specification are used for being understood and read by those skilled in the art in combination with the disclosure of the present utility model, and are not intended to limit the applicable limitations of the present utility model, and any structural modifications, proportional changes or size adjustments should still fall within the scope of the disclosure of the present utility model without affecting the efficacy and achievement of the present utility model.

Example 1

As shown in fig. 1, the utility model discloses a low-power-consumption miniaturized L-band frequency synthesizer, which comprises a power supply 1, a frequency synthesizer 2, an MCU3, a crystal oscillator 4 and a turning piece 5, wherein the output end of the power supply 1 is respectively connected with the frequency synthesizer 2, the MCU3, the crystal oscillator 4 and the turning piece 5, the output end of the crystal oscillator 4 is respectively connected with the frequency synthesizer 2 and the MCU3, the output end of the MCU3 is connected with the frequency synthesizer 2, the output end of the turning piece 5 is connected with the MCU3, the input end of the turning piece 5 receives a control signal, the output end of the frequency synthesizer 2 outputs L-band frequency, and the power supply 1 and the turning piece 5 are respectively externally connected with a power supply.

The frequency synthesizer 2 is a key device in modern communication systems, radars and test equipment, and can provide high-precision and high-stability frequency, wherein the L-band refers to a radio wave band with the frequency of 1-2 GHz.

Example 2

As shown in fig. 1, 7 and 8, preferably, the power supply 1, the frequency synthesizer 2, the MCU3, the crystal oscillator 4 and the rotor sheet 5 are mounted in the printed board 6, the printed board 6 is formed by pressing four layers, including a top signal layer, a middle power layer, a middle stratum and a bottom signal layer, the frequency synthesizer 2, the MCU3, the crystal oscillator 4 and the rotor sheet 5 are mounted in the top signal layer, the power supply 1 is mounted in the bottom signal layer, and the power supply 1 passes through the middle power layer and the middle stratum to be electrically connected with the frequency synthesizer 2, the MCU3, the crystal oscillator 4 and the rotor sheet 5 respectively.

The power supply 1 selects a related voltage stabilizer according to the requirements of main electronic components to supply power. After 5V power supply is performed outside, the power supply 1 generates corresponding working voltages required by all devices through a low dropout linear voltage regulator.

The frequency synthesizer 2 generates corresponding frequency synthesis after the power supply is powered on according to the requirement, the frequency synthesizer is a core component of the frequency synthesizer, and corresponding L-band frequency is generated under the control of the MCU.

The crystal oscillator 4 generates stable and reliable clock frequency for the frequency synthesizer and the MCU, and generates corresponding clock signals after working and sends the corresponding clock signals to the MCU and the frequency synthesizer for clock control.

The MCU3 is connected with a computer through a JP1 socket by controlling the generated L-band frequency change through software, and downloads related software to control the generated L-band frequency. After the frequency synthesizer parallel control signal enters the MCU, the frequency synthesizer is controlled to generate corresponding frequency by adjusting the software program setting parameter.

The rotary pressing sheet 5 converts the input 5V frequency control signal to 3.3V and sends the signal to the MCU for frequency control.

In order to reduce the structural size of the frequency synthesizer as much as possible, the printed board adopts a four-layer board design, which is respectively a signal layer (top layer), a power layer (middle layer), a stratum (middle layer) and a signal layer (bottom layer). The electronic components are respectively attached to the top layer and the bottom layer of the printed board, and the material is FR4, and the thickness is 1mm.

As shown in fig. 7 and 8, preferably, the printed board 6 is a square board with four inward corners, one side of the square board is provided with an isolation groove 9 extending inwards, the isolation groove 9 divides the printed board 6 into an integrated circuit part 6-1 and an output signal part 6-2, the frequency synthesizer 2, the MCU3, the crystal oscillator 4 and the turning piece 5 are mounted on the integrated circuit part 6-1 of the top signal layer of the printed board 6, the power supply 1 is mounted on the integrated circuit part 6-1 of the bottom signal layer of the printed board 6, the output signal part 6-2 of the top signal layer of the printed board 6 is mounted with a low-pass filter 8, and the output end of the frequency synthesizer 2 is electrically connected with the low-pass filter 8 and then outputs L-band frequencies.

As shown in fig. 7 and 8, the isolation groove 9 is preferably of an "L" structure.

The circuit of the power supply 1 is positioned at the bottom layer of the four-layer printed board, more copper is connected into the radiating holes of the LDO in the wiring board of the LDO, the radiating size is increased, the heating value of the device is reduced, and therefore the power consumption of the product is reduced.

Example 3

As shown in fig. 9 and 10, preferably, the printed board 6 is mounted in the synthesizer housing 7, the synthesizer housing 7 is composed of two square shells 7-1, four corners of the two square shells 7-1 are fixedly connected through screws, the opposite end faces of the two square shells 7-1 are provided with printed board mounting grooves 7-1-1, the printed board mounting grooves 7-1-1 are matched with the appearance of the printed board 6, protruding isolation walls 7-1-2 are arranged in the printed board mounting grooves 7-1-1, the protruding isolation walls 7-1-2 are limited in the isolation groove body 9, an input interface 7-2 is formed at one end of the synthesizer housing 7, a signal output interface 7-3 is formed at the other end of the synthesizer housing 7, a control signal wiring penetrates through the input interface 7-2 to be connected with a turning piece 5, an external power supply wiring penetrates through the input interface 7-2 to be connected with the power supply 1 and the turning piece 5, and the frequency synthesizer 2 is connected with a low-pass filter 8, and the wiring is connected with the low-pass filter 8 to output L band frequency outwards through the signal output interface 7-3.

The external dimensions of the synthesizer housing 7:

as shown in fig. 7, preferably, the integrated circuit portion 6-1 of the printed board 6 is respectively attached with LD, D0, D1, D2, D3, D4, D5, D6, GND and 5v connection points on one side far away from the output signal portion 6-2, the 5v connection points pass through the input interface 7-2 to be externally connected with a power supply, the 5v connection points are respectively connected with the power supply 1 and the converting sheet 5, the D0, D1, D2, D3, D4, D5, D6 connection points pass through the input interface 7-2 to be externally connected with a control device, the D0, D1, D2, D3, D4, D5, D6 connection points are respectively connected with the converting sheet 5, the LD connection points pass through the input interface 7-2 to be externally connected with a test device, the LD connection points are further connected with the MCU3, the other side of the integrated circuit portion 6-1 is further attached with a socket JP1, the socket JP1 is externally connected with a computer, and the socket JP1 is further connected with the MCU3.

As shown in fig. 7, preferably, the low-pass filter 8 includes a low-pass filter U7 and an OUT connection point, the input end of the low-pass filter U7 is connected to the frequency synthesizer 2, the output end of the low-pass filter U7 is connected to the OUT connection point, and the OUT connection point outputs the L-band frequency outwards through the signal output interface 7-3.

Because the frequency synthesizer uses components and parts quantity, the kinds are many, and these components and parts during operation very easily produce the interference to radio frequency output signal, influence output signal's spurious, harmonic and output phase noise to influence frequency synthesizer's output reliability and stability. The utility model adds a low-pass filter when designing output, and only passes signals lower than 1325MHz by adopting a filtering method; the printed board 6 and the synthesizer shell 7 adopt an isolation design, the printed board 6 reserves the assembly position of the convex isolation wall 7-1-2, the synthesizer shell 7 is processed to form the convex isolation wall 7-1-2, and physical isolation is adopted between the integrated circuit part 6-1 and the output signal part 6-2 to isolate an interference signal from a receiving system, so that a useful signal is normally transmitted, an interference coupling channel is cut off, and the purpose of inhibiting interference is achieved.

Example 4

As shown in fig. 2, preferably, the power supply 1 includes a low dropout linear regulator U1, a low dropout linear regulator U3, a low dropout linear regulator U4, the low dropout linear regulator U1, the low dropout linear regulator U3, a pin 1 of the low dropout linear regulator U4 is connected to a 5V connection point, the 5V connection point is externally connected to a power supply VSUPPLY, a pin 5 output voltage AVDD of the low dropout linear regulator U1, a pin 5 output voltage +3.3v of the low dropout linear regulator U3, and a pin 5 output voltage VVCO of the low dropout linear regulator U4.

As shown in fig. 2 to 6, preferably, the frequency synthesizer 2 includes a chip U2, the MCU3 includes a chip U5, and the rotor chip 5 includes a chip U6;

the crystal oscillator 4 comprises a chip X1, a resistor R37, a resistor R38 and a resistor R39, wherein the 4 pin of the chip X1 is connected with a voltage AVDD, the 3 pin of the chip X1 is connected with the resistor R37, the resistor R37 is respectively connected with the resistor R38 and the resistor R39, the resistor R38 is connected with the 29 pin of the chip U2 of the frequency synthesizer 2, and the resistor R39 is connected with the 2 pin of the chip U5 of the MCU 3;

pins 1, 2, 3 and 4 of a chip U2 of the frequency synthesizer 2 are sequentially connected with pins 12, 14, 8 and 11 of a chip U5 of the MCU3, pins 28 and 32 of the chip U2 are connected with voltage +3.3V, pin 26 of the chip U2 is connected with voltage AVDD, pins 13 and 16 of the chip U2 are connected with voltage VVCO, and pin 12 of the chip U2 is connected with output L-band frequency RFOUTAA;

the 1, 4 pins of the MCU3 chip U5 are connected with voltage +3.3V, the 15, 16, 17, 30, 31, 32, 33 and 34 pins of the chip U5 are sequentially connected with the 21, 20, 19, 18, 17, 16, 15 and 14 pins of the chip U6 of the rotary tablet 5, the 28 pin of the chip U5 is connected with the socket JP1, and the 20 and 24 pins of the chip U5 are connected with the LD wiring points;

the 1, 2, 22 external power supply VSUPPLY of chip U6 of the transfer chip 5, the 23, 24 pin of chip U6 connect voltage +3.3V, 3, 4, 5, 6, 7, 8, 9 pin of chip U6 connect gradually D0, D1, D2, D3, D4, D5, D6 wiring point.

Clock distribution of crystal oscillator: under the condition that the MCU and the frequency synthesizer both need stable clocks, clock signals generated by the crystal oscillator are distributed through the resistors R37, R38 and R39, so that the number of the crystal oscillator is reduced, the clock frequency is reduced, the working frequency of the device is reduced, and the power consumption is reduced.

The working principle of the utility model is as follows:

as shown in fig. 1 to 10, the utility model discloses a low-power consumption miniaturized L-band frequency synthesizer, which comprises a power supply 1, a frequency synthesizer 2, an MCU3, a crystal oscillator 4 and a turning piece 5, wherein the output end of the power supply 1 is respectively connected with the frequency synthesizer 2, the MCU3, the crystal oscillator 4 and the turning piece 5, the output end of the crystal oscillator 4 is respectively connected with the frequency synthesizer 2 and the MCU3, the output end of the MCU3 is connected with the frequency synthesizer 2, the output end of the turning piece 5 is connected with the MCU3, the input end of the turning piece 5 receives a control signal, the output end of the frequency synthesizer 2 outputs L-band frequency, and the power supply 1 and the turning piece 5 are respectively externally connected with a power supply; after 5V power supply is carried out on the outside of the power supply, corresponding working voltages required by all devices are generated through a low-dropout linear voltage stabilizer, an input 5V frequency control signal is converted to 3.3V by a conversion tablet and is sent to an MCU for frequency control, the L-band frequency change generated by the MCU is transmitted to a frequency synthesizer, the crystal oscillator generates stable and reliable clock frequency for the frequency synthesizer and the MCU, and the frequency synthesizer generates corresponding frequency synthesis after the power supply is powered on according to the requirements.

According to the utility model, clock signals generated by the crystal oscillator are distributed through the resistors R37, R38 and R39, so that the number of the crystal oscillator is reduced, the clock frequency is reduced, the working frequency of the device is reduced, and the power consumption is reduced.

The power supply, the frequency synthesizer, the MCU, the crystal oscillator and the transfer tablet are mounted in the printed board, the printed board is formed by pressing four layers of boards, the frequency synthesizer, the MCU, the crystal oscillator and the transfer tablet are mounted in the top layer signal layer, and the power supply is mounted in the bottom layer signal layer, so that the power supply can be manufactured into a small-volume synthesizer.

The printed board is provided with the L-shaped structure isolation groove body, the protruding isolation wall is arranged in the printed board installation groove of the synthesizer shell, and the protruding isolation wall is limited in the isolation groove body during installation, so that physical isolation is arranged between the integrated circuit part and the output signal part, interference signals are isolated, useful signals are normally transmitted, an interference coupling channel is cut off, the purpose of inhibiting interference is achieved, and the output reliability and stability of the frequency synthesizer are ensured.

The utility model is provided with the low-pass filter part, namely a low-pass filter is added, and only signals lower than 1325MHz pass through by adopting a filtering method, thereby reducing interference and improving the output reliability and stability of the synthesizer.

The L-band frequency synthesizer of the utility model supplies 5V voltage, current is less than 300mA, power consumption is 1.5w, power consumption is low, and external dimension isThe volume is small, and the electronic components are all domestic.

The main technical indexes of the frequency synthesizer are as follows:

1. output frequency range: 1025MHz to 1150MHz.

2. Frequency step: 1MHz.

3. Output power: 0 dBm+ -1.5 dB.

4. Frequency accuracy: 2ppm.

5. Frequency stability: 2ppm.

6. Output phase noise: less than or equal to-93 dBc/Hz@1KHz; less than or equal to-95 dBc/Hz@10KHz.

7. Spurious suppression: less than or equal to-70 dBc.

8. Harmonic suppression: less than or equal to-40 dBc.

9. Frequency hopping speed: less than or equal to 100us.

10. And (3) a power supply: 5V, < 300mA.

11. Output impedance: 50Ω.

12. Operating temperature: -55 to +85 ℃.

13. Storage temperature: 55 ℃ below zero to 125 ℃.

14. The control mode is as follows: parallel control, 7-bit TTL level discrete lines.

While the preferred embodiments of the present utility model have been described in detail, the present utility model is not limited to the above embodiments, and various changes may be made without departing from the spirit of the present utility model within the knowledge of those skilled in the art.

Many other changes and modifications may be made without departing from the spirit and scope of the utility model. It is to be understood that the utility model is not to be limited to the specific embodiments, but only by the scope of the appended claims.

Claims

1. A miniaturized L wave band frequency synthesizer of low-power consumption, characterized by: including power (1), frequency synthesizer (2), MCU (3), crystal oscillator (4) and commentaries on classics tablet (5) are connected respectively to the output of power (1), frequency synthesizer (2) and MCU (3) are connected respectively to the output of crystal oscillator (4), frequency synthesizer (2) are connected to the output of MCU (3), MCU (3) are connected to the output of commentaries on classics tablet (5), control signal is received to the input of commentaries on classics tablet (5), the output of frequency synthesizer (2) exports L wave band frequency, external power supply respectively is gone with commentaries on classics tablet (5) to power (1).

2. The low power miniaturized L-band frequency synthesizer of claim 1 wherein: the power supply (1), the frequency synthesizer (2), the MCU (3), the crystal oscillator (4) and the rotating tablet (5) are mounted in the printed board (6), the printed board (6) is formed by pressing four layers of boards, the frequency synthesizer (2), the MCU (3), the crystal oscillator (4) and the rotating tablet (5) are mounted in the top layer of the signal layer, the power supply (1) is mounted in the bottom layer of the signal layer, and the power supply (1) penetrates through the middle power layer and the middle stratum to be respectively electrically connected with the frequency synthesizer (2), the MCU (3), the crystal oscillator (4) and the rotating tablet (5).

3. A low power miniaturized L-band frequency synthesizer as in claim 2 wherein: the utility model discloses a PCB, including printed circuit board (6), PCB (6), low pass filter (8) are installed in the integrated circuit part (6-1), frequency synthesizer (2), MCU (3), crystal oscillator (4) and turn sheet (5) paste at the integrated circuit part (6-1) of PCB (6) top layer signal layer, power supply (1) paste at the integrated circuit part (6-1) of PCB (6) bottom layer signal layer, output signal part (6-2) paste of PCB (6) top layer signal layer is equipped with low pass filter (8), output and low pass filter (8) electricity of frequency synthesizer (2) are connected the back output L wave band frequency.

4. A low power miniaturized L-band frequency synthesizer as in claim 3 wherein: the isolation groove body (9) is of an L-shaped structure.

5. A low power miniaturized L-band frequency synthesizer as in claim 3 wherein: the utility model provides a synthesizer, including synthesizer shell (7), PCB (6), input interface (7-2) are offered to synthesizer shell (7), two square shells (7-1) four corners pass through screw fixed connection, PCB mounting groove (7-1-1) have been offered to two square shells (7-1) relative terminal surface, the appearance looks adaptation of PCB mounting groove (7-1-1) and PCB (6), be provided with protruding division wall (7-1-2) in PCB mounting groove (7-1-1), protruding division wall (7-1-2) are spacing in isolation cell body (9), input interface (7-2) have been offered to synthesizer shell (7) one end, signal output interface (7-3) have been offered to synthesizer shell (7) other end, control signal wiring passes input interface (7-2) and connects transfer tablet (5), external power supply wiring passes input interface (7-2) and connects power (1) and transfer tablet (5), frequency synthesizer (2) are connected low pass through signal output interface (7-3) and export frequency band outside after low pass filter spare (8).

6. The miniaturized L-band frequency synthesizer of claim 5 wherein: an LD, a D0, a D1, a D2, a D3, a D4, a D5, a D6, a GND and a 5v wiring point are respectively stuck on one side, far away from the output signal part (6-2), of the integrated circuit part (6) of the printed board (6), the 5v wiring point penetrates through an input interface (7-2) to be externally connected with a power supply, the 5v wiring point is also respectively connected with the power supply (1) and the rotating tablet (5), the D0, the D1, the D2, the D3, the D4, the D5 and the D6 wiring point penetrate through an input interface (7-2) to be externally connected with a control device, the D0, the D1, the D2, the D3, the D4, the D5 and the D6 wiring point are respectively connected with the rotating tablet (5), the LD wiring point penetrates through an input interface (7-2) to be externally connected with a test device, the LD wiring point is also connected with the MCU (3), a socket JP1 is also stuck on the other side of the integrated circuit part (6-1), the socket JP1 is externally connected with a computer, and the socket JP1 is also connected with the MCU (3).

7. The miniaturized L-band frequency synthesizer of claim 5 wherein: the low-pass filter (8) comprises a low-pass filter U7 and an OUT wiring point, the input end of the low-pass filter U7 is connected with the frequency synthesizer (2), the output end of the low-pass filter U7 is connected with the OUT wiring point, and the OUT wiring point passes through the signal output interface (7-3) to output L-band frequency outwards.

8. The low power miniaturized L-band frequency synthesizer of claim 6 wherein: the power supply (1) comprises a low-dropout linear voltage regulator U1, a low-dropout linear voltage regulator U3 and a low-dropout linear voltage regulator U4, wherein the 1 pin of the low-dropout linear voltage regulator U1, the low-dropout linear voltage regulator U3 and the 1 pin of the low-dropout linear voltage regulator U4 are connected with a 5V wiring point, the 5V wiring point is externally connected with a power supply VSUPPLY, the 5 pin output voltage AVDD of the low-dropout linear voltage regulator U1, the 5 pin output voltage +3.3V of the low-dropout linear voltage regulator U3 and the 5 pin output voltage VVCO of the low-dropout linear voltage regulator U4.

9. The low power miniaturized L-band frequency synthesizer of claim 8 wherein: the frequency synthesizer (2) comprises a chip U2, the MCU (3) comprises a chip U5, and the rotary tablet (5) comprises a chip U6;

the crystal oscillator (4) comprises a chip X1, a resistor R37, a resistor R38 and a resistor R39, wherein the 4 pin of the chip X1 is connected with a voltage AVDD, the 3 pin of the chip X1 is connected with the resistor R37, the resistor R37 is respectively connected with the resistor R38 and the resistor R39, the resistor R38 is connected with the 29 pin of the chip U2 of the frequency synthesizer (2), and the resistor R39 is connected with the 2 pin of the chip U5 of the MCU (3);

the 1, 2, 3 and 4 pins of the chip U2 of the frequency synthesizer (2) are sequentially connected with the 12, 14, 8 and 11 pins of the chip U5 of the MCU (3), the 28 and 32 pins of the chip U2 are connected with voltage +3.3V, the 26 pin of the chip U2 is connected with voltage AVDD, the 13 and 16 pins of the chip U2 are connected with voltage VVCO, and the 12 pin of the chip U2 is connected with output L-band frequency RFOUTAA;

the 1, 4 pins of the chip U5 of MCU (3) are connected with voltage +3.3V, the 15, 16, 17, 30, 31, 32, 33, 34 pins of the chip U5 are sequentially connected with 21, 20, 19, 18, 17, 16, 15, 14 pins of the chip U6 of the rotary tablet (5), the 28 pin of the chip U5 is connected with the socket JP1, and the 20, 24 pins of the chip U5 are connected with the LD wiring point;

the 1, 2, 22 external power supply VSUPPLY of chip U6 of transfer chip (5), the 23, 24 pin of chip U6 connect voltage +3.3V, 3, 4, 5, 6, 7, 8, 9 pins of chip U6 connect gradually D0, D1, D2, D3, D4, D5, D6 wiring point.