Four-channel signal amplification processing automatic receiving unit

Abstract

The utility model provides a four-channel signal amplification processing automatic receiving unit. The four-channel signal amplification processing automatic receiving unit comprises a voltage-stabilized power supply; and the power supply filter circuit is connected to the output end of the voltage-stabilized power supply, and the output end of the power supply filter circuit is electrically connected with a voltage-stabilized circuit. According to the four-channel signal amplification processing automatic receiving unit provided by the utility model, weak electric signals which are coupled into the receiving channels by a space antenna are amplified, and different channels are automatically controlled and switched by software, so that the production test efficiency and precision of signal receiving and amplification processing are improved. A superheterodyne receiving mode is adopted, and the receiving sensitivity is superior to 1 microvolt; the range of the matched antenna is wide, and unattended operation and timing automatic receiving of signals of more than 1000 kilometers in the ocean can be realized; the anti-interference capability is high; the load can be a loudspeaker or an earphone, and received signals are loud in sound and good in definition; the debugging difficulty is low; the device is convenient to carry, disassemble and maintain, and low in cost.

Description

Technical Field

[0001] The utility model relates to the technical field of fixed frequency, in particular to a four-channel signal amplification processing automatic receiving unit. Background Art

[0002] During the production and testing process of transceiver products, it is necessary to amplify the weak electrical signals coupled into the receiving channel by the space antenna. Sometimes it is necessary to receive and amplify signals from multiple directions during production and testing.

[0003] The traditional method of using a common channel, that is, a single-channel signal receiving and amplifying processing, has poor receiving sensitivity and weak anti-interference ability. The received signal is small, has poor clarity, and has high noise.

[0004] Therefore, it is necessary to provide a four-channel signal amplification processing automatic receiving unit to solve the above technical problems. Utility Model Content

[0005] The utility model provides a four-channel signal amplification processing automatic receiving unit, which solves the problems of poor receiving sensitivity, weak anti-interference ability, small received signal sound, poor clarity and large noise.

[0006] In order to solve the above technical problems, the utility model provides a four-channel signal amplification processing automatic receiving unit, comprising:

[0007] Regulated power supply;

[0008] A power filter circuit, wherein the power filter circuit is connected to the output end of the voltage-stabilized power supply, the output end of the power filter circuit is electrically connected to the voltage-stabilizing circuit, and the output end of the voltage-stabilizing circuit is respectively connected to the audio power amplifier circuit, the electronic volume circuit, the detection circuit, the second mixing circuit, the intermediate frequency amplification circuit, the second high-frequency amplification circuit, the first mixing circuit, the high-frequency oscillation circuit, the narrow-band filter circuit and the first high-frequency amplification circuit;

[0009] A single-chip microcomputer circuit module, the single-chip microcomputer circuit module is electrically connected to the output end of the voltage stabilizing circuit, the single-chip microcomputer circuit module includes a touch button, a light-emitting diode, an interface adapter, a relay group, a single-chip microcomputer chip and an electronic switch circuit, the relay group, the electronic switch circuit, the touch button and the light-emitting diode are all electrically connected to the output end of the single-chip microcomputer chip, and the interface adapter is electrically connected to the output end of the light-emitting diode.

[0010] Preferably, the relay group and the single-chip microcomputer chip are both electrically connected to the output end of the voltage stabilizing circuit.

[0011] Preferably, the output end of the relay group is electrically connected to the input end of the first high-frequency amplifier circuit and the second high-frequency amplifier circuit respectively, and the output end of the electronic switch circuit is electrically connected to the input end of the high-frequency oscillation circuit.

[0012] Preferably, the output end of the narrowband filter circuit is electrically connected to the input end of the second high-frequency amplification circuit.

[0013] Preferably, the output end of the second high-frequency amplifier circuit is electrically connected to the input end of the first mixer circuit, the output end of the first mixer circuit is electrically connected to the input end of the intermediate frequency amplifier circuit, the output end of the intermediate frequency amplifier circuit is electrically connected to the input end of the second mixer circuit, the output end of the second mixer circuit is electrically connected to the input end of the detector circuit, the output end of the detector circuit is electrically connected to the input end of the electronic volume circuit, the output end of the electronic volume circuit is electrically connected to the input end of the audio power amplifier circuit, and the output end of the audio power amplifier circuit is electrically connected to a load.

[0014] Preferably, the output end of the high-frequency oscillation circuit is electrically connected to a first mixing circuit and a second mixing circuit respectively.

[0015] Preferably, the output end of the detection circuit is also electrically connected to the input end of the audio power amplifier circuit.

[0016] Compared with the related art, the four-channel signal amplification processing automatic receiving unit provided by the utility model has the following beneficial effects:

[0017] The utility model provides a four-channel signal amplification processing automatic receiving unit, which amplifies and processes weak electrical signals coupled into the receiving channel by a space antenna, and uses software automatic control to switch different channels, thereby improving the production test efficiency and accuracy of signal reception and amplification processing. The superheterodyne receiving method is adopted, and the receiving sensitivity is better than 1 microvolt; the matching antenna has a wide range, which can realize unattended and timed automatic reception of signals over 1,000 kilometers in the ocean; the anti-interference ability is strong; the load can be a speaker or a headset, and the received signal has a loud sound and good clarity; the debugging difficulty is low; it is easy to carry, easy to disassemble, easy to repair, and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural block diagram of a four-channel signal amplification processing automatic receiving unit of the utility model;

[0019] Figure 2 for Figure 1 A simplified circuit diagram of the first high-frequency amplifier circuit shown;

[0020] Figure 3 for Figure 1 The simplified circuit diagram of the narrowband filter circuit shown;

[0021] Figure 4 for Figure 1 The simplified circuit diagram of the second high-frequency amplifier circuit shown;

[0022] Figure 5 for Figure 1 The simple circuit diagram of the high-frequency oscillation circuit shown;

[0023] Figure 6 for Figure 1 The simplified circuit diagram of the first mixer circuit shown;

[0024] Figure 7 for Figure 1 The simplified circuit schematic diagram of the second mixer circuit shown;

[0025] Figure 8 for Figure 1 The simple circuit diagram of the audio power amplifier circuit shown;

[0026] Fig. 9 for Figure 1 The simple circuit schematic diagram of the microcontroller circuit module is shown.

[0027] Numbers in the figure: 1. Voltage-stabilized power supply, 2. Single-chip microcomputer circuit module, 3. First high-frequency amplifier circuit, 4. Narrow-band filter circuit, 5. Second high-frequency amplifier circuit, 6. High-frequency oscillation circuit, 7. First mixing circuit, 8. Intermediate frequency amplifier circuit, 9. Second mixing circuit, 10. Detection circuit, 11. Electronic volume circuit, 12. Audio power amplifier circuit, 13. Single-chip microcomputer chip, 14. Electronic switch circuit, 15. Relay group, 16. Touch button, 17. Light-emitting diode, 18. Interface adapter, 19. Voltage-stabilized circuit, 20. Circuit filter circuit. DETAILED DESCRIPTION

[0028] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0029] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 ,in, Figure 1 This is a structural block diagram of a four-channel signal amplification processing automatic receiving unit of the utility model; Figure 2 for Figure 1 A simplified circuit diagram of the first high-frequency amplifier circuit shown; Figure 3 for Figure 1 The simplified circuit diagram of the narrowband filter circuit shown; Figure 4 for Figure 1 The simplified circuit diagram of the second high-frequency amplifier circuit shown;

[0030] Figure 5 for Figure 1 The simple circuit diagram of the high-frequency oscillation circuit shown; Figure 6 for Figure 1 The simplified circuit diagram of the first mixer circuit shown; Figure 7 for Figure 1 The simplified circuit schematic diagram of the second mixer circuit shown;

[0031] Figure 8 for Figure 1 The simple circuit diagram of the audio power amplifier circuit shown; Fig. 9 for Figure 1 The simple circuit schematic diagram of the single-chip circuit module is shown. A four-channel signal amplification processing automatic receiving unit includes: a voltage-stabilized power supply 1;

[0032] A power filter circuit 20, wherein the power filter circuit 20 is connected to the output end of the voltage-stabilized power supply 1, the output end of the power filter circuit 20 is electrically connected to the voltage-stabilizing circuit 19, and the output end of the voltage-stabilizing circuit 19 is respectively connected to the audio power amplifier circuit 12, the electronic volume circuit 11, the detection circuit 10, the second mixing circuit 9, the intermediate frequency amplifier circuit 8, the second high-frequency amplifier circuit 5, the first mixing circuit 7, the high-frequency oscillation circuit 6, the narrowband filter circuit 4 and the first high-frequency amplifier circuit 3;

[0033] The single-chip computer circuit module 2 is electrically connected to the output end of the voltage stabilizing circuit 19. The single-chip computer circuit module 2 includes a touch button 16, a light-emitting diode 17, an interface adapter 18, a relay group 15, a single-chip computer chip 13 and an electronic switch circuit 14. The relay group 15, the electronic switch circuit 14, the touch button 16 and the light-emitting diode 17 are all electrically connected to the output end of the single-chip computer chip 13, and the interface adapter 18 is electrically connected to the output end of the light-emitting diode 18.

[0034] The relay group 15 and the single-chip microcomputer chip 13 are both electrically connected to the output end of the voltage stabilizing circuit 19 .

[0035] The output end of the relay group 15 is electrically connected to the input end of the first high-frequency amplifier circuit 3 and the second high-frequency amplifier circuit 5 respectively, and the output end of the electronic switch circuit 16 is electrically connected to the input end of the high-frequency oscillation circuit 6 .

[0036] The output end of the narrowband filter circuit 4 is electrically connected to the input end of the second high-frequency amplifier circuit 5 .

[0037] The output end of the second high-frequency amplifier circuit 5 is electrically connected to the input end of the first mixer circuit 7, the output end of the first mixer circuit 7 is electrically connected to the input end of the intermediate frequency amplifier circuit 8, the output end of the intermediate frequency amplifier circuit 8 is electrically connected to the input end of the second mixer circuit 9, the output end of the second mixer circuit 9 is electrically connected to the input end of the detector circuit 10, the output end of the detector circuit 10 is electrically connected to the input end of the electronic volume circuit 11, the output end of the electronic volume circuit 11 is electrically connected to the input end of the audio power amplifier circuit 12, and the output end of the audio power amplifier circuit 12 is electrically connected to a load 21.

[0038] The output end of the high frequency oscillation circuit 6 is electrically connected to the first mixing circuit 7 and the second mixing circuit 9 respectively.

[0039] The output end of the detection circuit 10 is also electrically connected to the input end of the audio power amplifier circuit 12 .

[0040] The single-chip circuit module 2 includes a single-chip chip 13, an electronic switch circuit 14, a relay group 15, a touch button 16, a light-emitting diode 17, and an interface adapter 18. The single-chip chip 13 adopts a dual-in-line AT89C2051, which is a low-voltage, high-performance 8-bit CMOS microcomputer with 2K bytes of flash memory and erasable programmable read-only memory (EPROM). The device is produced using Atmel's high-density non-volatile technology and is compatible with the industrial-grade MCS51 architecture group. The Atmel chip integrates a general-purpose 8-bit CPU and flash memory on a single chip, providing high flexibility and low cost for many embedded controls. It contains 2K bytes of flash memory, 128 bytes of RAM, 15 I / O ports, two 16-bit timers / counters, a five-loss two-level interrupt structure, a full-duplex serial communication port, and a precision analog comparator. The single-chip microcomputer chip 13 uses a chip-level oscillator and clock circuit. When the chip is designed with static logic, it can work at a frequency as low as zero. It supports two software-selectable energy-saving modes. In the micro-power mode, the contents of the RAM are saved, but the oscillator is frozen and all other chip functions are disabled until the next hardware reset. Therefore, when using this chip, it is easy to disassemble and assemble, has good stability, the logical relationship of the programming process is simple, and the logical operation process is not prone to abnormalities. The control port is specifically shown in Fig. 9; The core of the electronic switch circuit 14 is the NPN type low-power transistor C9014 and the germanium switch diode 2AK9. C9014 is a low-noise tube with a wide range of uses. When no current flows through the base of C9014, the collector also has no current. At this time, C9014 is in a cut-off state, and the collector and the emitter are equivalent to an open circuit; when current flows through the base of C9014, if it causes too much current to flow through the collector, the transistor enters a saturated state, and the collector and the emitter are equivalent to a short circuit, so C9014 can be used as a switch; the relay group 15 is the path for the RF output of the first high-frequency amplifier circuit 3 and the RF input of the second high-frequency amplifier circuit 5. The relay group 15 is provided by the program chip I / O port to the low-power transistor C9014 high and low levels to control the power supply state of its coil, such as: the relay coil controlling the 2.5MHz frequency point in the relay group 15 is energized, and the narrowband filter circuit 4 of the frequency point is turned on, otherwise it is turned off. The specific principle is shown in Figure 3 and Fig. 9 Touch button 16 is to control the four-channel signal amplification processing automatic receiving unit 1 to perform manual frequency switching; light-emitting diode 17 is an indication of the receiving signal of any channel in the four channels and the automatic receiving state; interface adapter 18 is an external interface for the control state of the four-channel signal amplification processing automatic receiving unit 1, see the specific principle Fig. 9 ;

[0041] The first high frequency amplifier circuit 3 is an automatic receiving unit for amplifying and processing four-channel signals, and amplifies the four-channel signals received from the antenna. The specific principle is shown in Figure 2 ;

[0042] The narrowband filter circuit 4 filters the radio frequency signal amplified by the first high-frequency amplifier circuit 3 through the control of the single-chip microcomputer chip 13 in the single-chip microcomputer circuit module 2 and the path of the relay group 15, so that the required signal enters the lower level processing. The specific principle is shown in Figure 3 ;

[0043] The second high-frequency amplifier circuit 5 amplifies the radio frequency signal output by the narrow-band filter circuit 4. In order to avoid the occurrence of self-excitation, the amplification of this stage is limited to about 10 times. The specific principle is shown in Figure 4 ;

[0044] The high frequency oscillator circuit 6 can generate radio frequency signals with frequencies of 2.5 MHz, 5 MHz, 10 MHz, 15 MHz and 6.045 MHz and peak amplitude greater than 5 V. The specific principle is shown in Figure 5 ;

[0045] The first mixing circuit 7 mixes the RF signal output by the high-frequency oscillation circuit 6 into the 10th pin of the chip MC1496P with the RF signal output by the second high-frequency amplifier circuit 5 into the 1st pin of the chip MC1496P. After mixing inside the chip, a fixed RF signal with a frequency of 6.5MHz is output from the 6th pin of the chip MC1496P. MC1496P is an integrated double-balanced four-quadrant analog multiplier with excellent carrier suppression, good chip stability, high linearity and reliability, and strong adaptability. The specific principle is shown in Figure 6 ;

[0046] The intermediate frequency amplifier circuit 8 couples and amplifies the RF signal with a frequency of 6.5 MHz output from the first mixer circuit 7. The signal coupling adopts a coil with a shielding cover, and the core amplifier tube adopts a crystal triode C9014 with an amplification factor greater than 100. The specific principle is shown in Figure 7 ;

[0047] The second mixer circuit 9 is completed inside the integrated circuit TA7640AP. The radio frequency signal amplified by the intermediate frequency amplifier circuit 8 is coupled to the pin 1 of the integrated circuit TA7640AP through the coil with a shielding cover, and then the radio frequency signal with a frequency of 6.045MHz generated by the high-frequency oscillation circuit 6 is sent to the pin 3 of the integrated circuit TA7640AP. The local oscillation signal is sent to the pin 3. In order to improve its stability, the local oscillation signal first enters the buffer amplifier, i.e., the emitter follower, and is sent to the pin 3 after buffering to ensure the isolation of the local oscillation level and the mixing level, so as to overcome the The TA7640AP integrated circuit has a mixer inside. The mixer adopts a dual differential multiplier structure, has a large frequency conversion gain, and has good AGC characteristics. The amplified 6.5MHZ signal is added from pins 1 and 2 of the TA7640AP chip to the base of the differential tube inside the chip, and mixed with the local oscillation signal. Through the AM mixer, AM intermediate amplifier, AM detection, AM switch and other circuits integrated in the TA7640AP integrated circuit, the modulated signal with a carrier frequency of 455KHz and an audio signal is amplified by the intermediate frequency amplifier. The intermediate frequency amplifier circuit inside the TA7640AP integrated circuit is composed of a three-stage differential amplifier with DC coupling between stages; the DC negative feedback resistor is used to improve the working stability of the amplifier, and the intermediate frequency amplifier circuit is also controlled by the AGC circuit. Since the mixer and the intermediate frequency amplifier circuit are both controlled by the AGC circuit, it is not easy to cause blocking when a strong signal enters. For specific principles, see Figure 7 ;

[0048] The detection circuit 10 is a negative phase peak detector. The amplified modulated intermediate frequency signal is detected inside the integrated circuit TA7640AP. The detected audio signal (with DC component) is output from the 9th pin of the integrated circuit TA7640AP, coupled by capacitors, and sent to the incident follower. The specific principle is shown in Figure 7 ;

[0049] The electronic volume circuit 11 is to couple the audio signal output by the emitter follower into the core chip X9511ZPM of the electronic volume circuit through capacitor coupling. The chip is a digital potentiometer, which is accurate and convenient to adjust, has a long service life, is less affected by the physical environment, has stable performance, and has the characteristics of button control and linear output. It contains 31 resistor units and 32 output sliding ends. The sliding end is controlled by the negative pulse input to the pin to slide to the VH or VL end. The sliding end position can be stored in the non-volatile memory EEPROM, so that it can automatically return to its original position after power-on. The specific principle is shown in Figure 8 ;

[0050] The audio power amplifier circuit 12 is to couple the audio signal output by the emitter follower through a resistor and a capacitor in series, and then enter the 7th pin of the integrated circuit TDA2822M. After the audio amplification, the signal is output in two ways. One way is the 3rd pin of the integrated circuit TDA2822M, and the load is a speaker or earphone; the other way is the 1st pin of the integrated circuit TDA2822M, and the load is the line input. The integrated circuit TDA2822M is a dual-channel monolithic power amplifier integrated circuit developed by STMicroelectronics (ST). It has the characteristics of simple peripheral circuit, good sound quality, wide voltage range, etc. Its quiescent current and crossover distortion are both small. The specific principle is shown in Figure 8 ;

[0051] The voltage regulator circuit 19 converts the DC 12V power supply supplied to the four-channel signal amplification processing automatic receiving unit 1 into DC 9V through the three-terminal voltage regulator L7809CV, and then into DC 5V through the three-terminal voltage regulator L7805CV, and sends it to the single-chip circuit module 2;

[0052] The power supply filter circuit 20 is used to filter the power supplied to the four-channel signal amplification processing automatic receiving unit 1 through an LC network;

[0053] The load 21 refers to: ① a 4-ohm speaker or earphone and ② a line input port.

[0054] The working principle of the four-channel signal amplification processing automatic receiving unit provided by the utility model is as follows:

[0055] A superheterodyne receiving mode is adopted with a receiving sensitivity better than 1 microvolt. The weak signal at the signal input port is amplified and processed to increase the receiving distance of the automatic receiving unit. The LC filter network is changed to a narrowband filter with frequencies of 2.5MHz, 5MHz, 10MHz, and 15MHz; the amplification factor of the core transistors in the first high-frequency amplifier circuit 3, the second high-frequency amplifier circuit 5, and the high-frequency oscillation circuit 6 is increased; the Q value of the coupling coil used in the intermediate frequency amplifier circuit 8 is increased, the layout of the printed circuit board is changed from a single-sided board to a multi-layer board, and the multi-point grounding is changed to a large-area grounding; components are selected from discrete devices and modular devices that are easily purchased in the market; the logical relationship of the program is simplified to quickly lock the signal. These measures are adopted to improve the anti-interference ability of the four-channel signal amplification and processing automatic receiving unit. A point frequency filter is added to the signal input port, an inductor is added to the power supply part, the out-of-band noise of the automatic receiving unit is reduced, the coupling coil parameters of the second-stage intermediate frequency signal are improved, the coupling resonance degree of the useful signal is improved, and the transmission efficiency of the useful signal is increased. The power amplifier load 21 is changed from 8 ohms to 4 ohms, the output amplitude of the audio power is increased, and the difficulty of extracting the audio signal in the later stage of the automatic receiving unit is reduced. The series resonant circuit used for the collectors of the first high-frequency amplifier circuit 3 and the second high-frequency amplifier circuit 5 is removed, and the debugging points of the unit are reduced from the traditional 14 points to 4 points, which reduces the difficulty of debugging. During maintenance, by holding a stylus to sense the signal and combining with fewer debugging points, the on-off and amplification status of the channel can be known, and the preliminary judgment of the on-off of the signal can be completed quickly without the need for a signal source, which is convenient for maintenance.

[0056] Compared with the related art, the four-channel signal amplification processing automatic receiving unit provided by the utility model has the following beneficial effects:

[0057] By amplifying the weak electrical signal coupled into the receiving channel by the space antenna, the software is automatically controlled to switch different channels to improve the production test efficiency and accuracy of signal reception and amplification processing. The superheterodyne receiving method is adopted, and the receiving sensitivity is better than 1 microvolt; the matching antenna has a wide range, which can realize unattended and timed automatic reception of signals over 1,000 kilometers in the ocean; the anti-interference ability is strong; the load can be a speaker or a headset, and the received signal is loud and clear; the debugging difficulty is low; it is easy to carry, easy to disassemble, easy to repair, and low cost.

[0058] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A four-channel signal amplification processing automatic receiving unit, characterized in that: include: Regulated power supply; A power filter circuit, wherein the power filter circuit is connected to the output end of the voltage-stabilized power supply, the output end of the power filter circuit is electrically connected to the voltage-stabilizing circuit, and the output end of the voltage-stabilizing circuit is respectively connected to an audio power amplifier circuit, an electronic volume circuit, a detection circuit, a second frequency mixing circuit, an intermediate frequency amplification circuit, a second high-frequency amplification circuit, a first frequency mixing circuit, a high-frequency oscillation circuit, a narrow-band filter circuit and a first high-frequency amplification circuit; A single-chip microcomputer circuit module, the single-chip microcomputer circuit module is electrically connected to the output end of the voltage stabilizing circuit, the single-chip microcomputer circuit module includes a touch button, a light-emitting diode, an interface adapter, a relay group, a single-chip microcomputer chip and an electronic switch circuit, the relay group, the electronic switch circuit, the touch button and the light-emitting diode are all electrically connected to the output end of the single-chip microcomputer chip, and the interface adapter is electrically connected to the output end of the light-emitting diode.

2. A four-channel signal amplification processing automatic receiving unit according to claim 1, characterized in that: The relay group and the single-chip microcomputer chip are both electrically connected to the output end of the voltage stabilizing circuit.

3. A four-channel signal amplification processing automatic receiving unit according to claim 2, characterized in that: The output end of the relay group is electrically connected to the input end of the first high-frequency amplifier circuit and the second high-frequency amplifier circuit respectively, and the output end of the electronic switch circuit is electrically connected to the input end of the high-frequency oscillation circuit.

4. A four-channel signal amplification processing automatic receiving unit according to claim 3, characterized in that: The output end of the narrowband filter circuit is electrically connected to the input end of the second high-frequency amplifier circuit.

5. A four-channel signal amplification processing automatic receiving unit according to claim 4, characterized in that: The output end of the second high-frequency amplifier circuit is electrically connected to the input end of the first mixer circuit, the output end of the first mixer circuit is electrically connected to the input end of the intermediate frequency amplifier circuit, the output end of the intermediate frequency amplifier circuit is electrically connected to the input end of the second mixer circuit, the output end of the second mixer circuit is electrically connected to the input end of the detector circuit, the output end of the detector circuit is electrically connected to the input end of the electronic volume circuit, the output end of the electronic volume circuit is electrically connected to the input end of the audio power amplifier circuit, and the output end of the audio power amplifier circuit is electrically connected to a load.

6. A four-channel signal amplification processing automatic receiving unit according to claim 5, characterized in that: The output end of the high frequency oscillation circuit is electrically connected to the first mixing circuit and the second mixing circuit respectively.

7. A four-channel signal amplification processing automatic receiving unit according to claim 6, characterized in that: The output end of the detection circuit is also electrically connected to the input end of the audio power amplifier circuit.

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