CN212210950U - Programmable amplitude modulation signal generation system - Google Patents
Programmable amplitude modulation signal generation system Download PDFInfo
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- CN212210950U CN212210950U CN201922328628.5U CN201922328628U CN212210950U CN 212210950 U CN212210950 U CN 212210950U CN 201922328628 U CN201922328628 U CN 201922328628U CN 212210950 U CN212210950 U CN 212210950U
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Abstract
The utility model relates to a system takes place for amplitude modulation signal able to programme, including MCU treater, AF4351 module, 5510LCD display module, signal mixing circuit and baseband amplifier circuit, the MCU treater with AF4351 module link to each other, 5510LCD display module with the MCU treater link to each other, AF4351 module with signal mixing circuit local oscillator signal end link to each other, signal mixing circuit and baseband amplifier circuit's LM358 two-stage fortune put and link to each other. The utility model has the advantages that: the structure is used for generating the modulation signal, a special controller is not needed, and the generation of the related electric signals under different requirements can be automatically realized. The test device can meet the requirement of generating a specific level signal for testing under various conditions, and is convenient for the use of vast users. The system is externally provided with a key switch, so that the local oscillator signal can be directly set, and the reliability and the practicability of the whole system are further improved.
Description
Technical Field
The present invention relates to a mixer circuit structure for generating a specific signal, and more particularly to a programmable amplitude modulation signal generating system.
Background
Mixers, also known as frequency converters, are important modules of signal processing front-end circuits, which are widely used in transceiver systems. Mixers are essentially used to achieve spectral shifting of a signal, that is, shifting a signal from one frequency to another. For the signal processing process, it is necessary to shift the signal to be mixed from the middle low frequency band to the radio frequency band, and this process is called up-mixing. For a receiver, it is necessary to shift the signal to be mixed from the radio frequency band to a medium-low frequency band, and this process is called down-mixing (or "down-conversion"). In practical applications, the mixer may be implemented by a multiplier.
Mixers typically implement a frequency conversion operation on the signal to be mixed based on a local oscillator signal. In the direct conversion receiver, for the down-conversion operation, the frequency of the signal to be mixed is the same as the local oscillation frequency of the local oscillation signal; for up-conversion operation, the frequency of the mixer output signal is the same as the local oscillator frequency. The system generates amplitude-modulated local oscillation signals based on an STM32 single chip microcomputer, and programmable regulation and control of the signals are realized.
However, due to the non-linear characteristics of the electronics, harmonics are inevitably generated during transceiver operation. And at the same time, the special requirements for the signal, it is therefore necessary to provide a programmable amplitude modulation signal generation system. Meanwhile, the traditional signal generator and the frequency mixing are large in size and expensive, so that the traditional signal generator and the frequency mixing cannot be widely applied to experiments.
Therefore, it is necessary to provide a signal mixing method to solve the above problems.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a can adapt to under the multiple condition, produce the requirement that specific level signal carries out the experiment, make things convenient for user wide's the programmable amplitude modulation signal generation system of use.
In order to solve the technical problem, the utility model adopts the technical scheme that: the programmable amplitude modulation signal generation system is characterized in that: the display device comprises an MCU (microprogrammed control unit) processor, an ADF (automatic document feeder) 4351 module, a 5510LCD (liquid crystal display) module, a signal mixing circuit and a baseband amplifying circuit, wherein the MCU processor is connected with the ADF4351 module, the 5510LCD module is connected with the MCU processor, the ADF4351 module is connected with a local oscillation signal end of the signal mixing circuit, and the signal mixing circuit is connected with two stages of operational amplifiers (LM 358) of the baseband amplifying circuit.
Further, the ADF4351 module generates a clock sine or square pulse signal under the control of the single chip microcomputer, and executes different driving programs according to different requirements.
Further, the signal output by the ADF4351 module is in phase with the signal output by the LM358 two-stage amplifier circuit of the baseband amplifier circuit.
Furthermore, the signal end of the signal mixing circuit is connected with an external modulation signal.
The utility model has the advantages that:
(1) the utility model discloses amplitude modulation signal emergence system able to programme, this system of this structure are used for modulating signal to generate the structure, need not special controller, can realize producing relevant signal of telecommunication under the different requirements automatically. The test device can meet the requirement of generating a specific level signal for testing under various conditions, and is convenient for the use of vast users. The system is externally provided with a key switch, so that local oscillation signals can be directly set, and the reliability and the practicability of the whole system are further improved;
(2) the utility model discloses amplitude modulation signal generation system able to programme, the harmonic problem and the signal generator of solving current small-size mixer are complicated, and require the problem that lower within range system can't integrate, need not special complicated controller, can realize automatically after simple configuration, can realize the function signal output of many demands and the mixing of signal is handled.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a block diagram of the system of the present invention.
Fig. 2 is a circuit diagram of the baseband amplification module of the amplitude modulation signal generation system of the present invention.
Fig. 3 is a schematic diagram of the mixer circuit module according to the present invention.
Detailed Description
The following examples are presented to enable those skilled in the art to more fully understand the present invention and are not intended to limit the scope of the present invention.
Examples
The programmable amplitude modulation signal generation system of this embodiment, as shown in fig. 1-3, includes an MCU processor 1, an ADF4351 module 2, a 5510LCD display module 3, a signal mixing circuit 4 and a baseband amplifying circuit 5, where the MCU processor 1 is connected to the ADF4351 module 2, the 5510LCD display module 3 is connected to the MCU processor 1, the ADF4351 module is connected to the signal mixing circuit 4, and a local oscillator signal terminal of the signal mixing circuit 4 is connected to the LM358 two-stage operational amplifier of the baseband amplifying circuit 5.
As an example, a more specific implementation is that the ADF4351 module generates a standard clock sine or square wave pulse signal under the control of the single chip, and specifically executes different driving procedures according to different requirements, the signal output by the ADF4351 module is in phase with the output signal of the LM358 two-stage amplifying circuit of the baseband amplifying circuit, and the signal end of the signal mixing circuit is connected to an external modulation signal.
The signal carrier frequency of the embodiment is 285.7MHz, and the signal is externally connected with a standard sinusoidal signal. After the frequency mixing of the frequency mixing circuit, the stepping of the frequency mixing signal is 1 MHZ. Then the signal of the system is input into a ceramic filter, enters a baseband amplifying circuit after the signal is received, and is demodulated, the output signal Voms is a modulation frequency signal of 1V + -0.1V, and the demodulated signal has no obvious distortion.
The basic principles and main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A programmable amplitude modulated signal generating system, characterized by: the display device comprises an MCU (microprogrammed control unit) processor, an ADF (automatic document feeder) 4351 module, a 5510LCD (liquid crystal display) module, a signal mixing circuit and a baseband amplifying circuit, wherein the MCU processor is connected with the ADF4351 module, the 5510LCD module is connected with the MCU processor, the ADF4351 module is connected with a local oscillation signal end of the signal mixing circuit, and the signal mixing circuit is connected with two stages of operational amplifiers (LM 358) of the baseband amplifying circuit.
2. The programmable amplitude modulation signal generation system of claim 1, wherein: the ADF4351 module generates a clock sine or square wave pulse signal under the control of the singlechip, and executes different driving programs according to different requirements.
3. A programmable amplitude modulation signal generation system according to claim 1 or 2, characterized in that: the signal output by the ADF4351 module is in phase with the output signal of the LM358 two-stage amplifying circuit of the baseband amplifying circuit.
4. The programmable amplitude modulation signal generation system of claim 1, wherein: and the signal end of the signal mixing circuit is connected with an external modulation signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922328628.5U CN212210950U (en) | 2019-12-23 | 2019-12-23 | Programmable amplitude modulation signal generation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922328628.5U CN212210950U (en) | 2019-12-23 | 2019-12-23 | Programmable amplitude modulation signal generation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212210950U true CN212210950U (en) | 2020-12-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922328628.5U Active CN212210950U (en) | 2019-12-23 | 2019-12-23 | Programmable amplitude modulation signal generation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212210950U (en) |
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2019
- 2019-12-23 CN CN201922328628.5U patent/CN212210950U/en active Active
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