CN114337696A - Intermediate frequency generating device based on ARM control - Google Patents
Intermediate frequency generating device based on ARM control Download PDFInfo
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- CN114337696A CN114337696A CN202111633819.8A CN202111633819A CN114337696A CN 114337696 A CN114337696 A CN 114337696A CN 202111633819 A CN202111633819 A CN 202111633819A CN 114337696 A CN114337696 A CN 114337696A
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Abstract
The invention provides an intermediate frequency generating device based on ARM control, which comprises: a receiving antenna for receiving the acquired signal; a local oscillator frequency generator for providing a local oscillator frequency, the local oscillator frequency generator comprising: local oscillator control module and local oscillator frequency generation module, local oscillator control module includes: ARM, the local oscillator frequency generation module includes: an LMX2581 chip; and the frequency device is used for mixing and filtering the signals received and collected by the receiving antenna and the local oscillation frequency provided by the local oscillation frequency generator, then amplifying the filtered signals, and then performing power filtering after amplification to generate the required intermediate frequency and power. Different local oscillator frequency signals can be generated quickly. And can be switched quickly as required. The method can be applied to radio signal processing, can also be applied to the field of radio communication by combining other basic radio processing technologies, and has good application prospect.
Description
Technical Field
The invention belongs to the field of signal processing, and particularly relates to an intermediate frequency generation device based on ARM control.
Background
In order to make the amplifier operate stably and reduce interference, a general receiver changes the high frequency signal into an intermediate frequency signal, an image intermediate frequency signal of a television is 38MHz, and an audio intermediate frequency signal is 6.5 MHz.
At present, the short wave and ultra-short wave channelized processing technology is a promising receiving mode in the radio baseband processing technology in the communication field. Due to the fact that the power and the types of the received signals are large, the efficiency of signal processing becomes a great bottleneck, and the power and the types of the signals can not be used efficiently.
Disclosure of Invention
In view of this, the present invention is directed to an ARM control based if generating apparatus, so as to solve the technical problem that the signal power and type cannot be used efficiently in the if processing process in the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an intermediate frequency generating device based on ARM control comprises:
a receiving antenna for receiving the acquired signal;
a local oscillator frequency generator for providing a local oscillator frequency, the local oscillator frequency generator comprising: local oscillator control module and local oscillator frequency generation module, local oscillator control module includes: ARM, the local oscillator frequency generation module includes: an LMX2581 chip;
and the mixer is used for mixing and filtering the signals received and collected by the receiving antenna and the local oscillator frequency provided by the local oscillator frequency generator, then amplifying the filtered signals, and then performing power filtering after amplification to generate the required intermediate frequency and power.
Further, the mixer includes: and the RF & DC pin of the RCBT-63+ chip is electrically connected with the receiving antenna, and the RF pin of the RCBT-63+ chip is electrically connected with the local frequency generator.
Further, the mixer further includes: and the NC1, NC2 and NC3 pins of the RCBT-63+ chip are electrically connected with the electric connection terminal respectively.
Further, the DC pin of the RCBT-63+ chip is electrically connected with a filtering power supply.
Further, the filtering power supply includes:
the first capacitor, the second capacitor and the third capacitor are connected in parallel, one end of the first capacitor, the second capacitor and the third capacitor is electrically connected with a DC power supply, and the other end of the first capacitor, the second capacitor and the third capacitor is electrically connected with a grounding end.
Further, the DATA, CLK and LE pins of the LMX2581 chip are electrically connected with the ARM.
Further, the local oscillation frequency generation module further includes: the oscillator comprises a fourth capacitor, a fifth capacitor, a first resistor, a second resistor and a third point resistor, wherein an OSC pin of the MX2581 chip is electrically connected with a first end of the fifth capacitor, a second end of the fifth capacitor is electrically connected with a first end of the third resistor, a second end of the third resistor is respectively electrically connected with second ends of the first resistor and the second resistor, a first end of the first resistor is connected with a reference clock signal, and a first end of the second resistor is electrically connected with a grounding end.
Further, the local oscillation frequency generation module further includes: the circuit comprises a sixth capacitor, a fourth resistor, a seventh capacitor, an eighth capacitor, a fifth resistor, a high-pass filter, a first low-pass filter, a second low-pass filter and a radio-frequency amplifier;
the RF-OUTA-pin of the LMX2581 chip is electrically connected to the first terminal of the sixth capacitor, a second end of the sixth capacitor is electrically connected to the first end of the high-pass filter, a second end of the high-pass filter is electrically connected to the first end of the fourth resistor, a second end of the fourth resistor is electrically connected with a first end of the first low-pass filter, a second end of the first low-pass filter is electrically connected with a first end of the seventh capacitor, the second end of the seventh capacitor is electrically connected with the input end of the radio frequency amplifier, the output end of the radio frequency amplifier is electrically connected with the first end of the eighth capacitor, a second end of the eighth capacitor is electrically connected with a first end of a second low-frequency filter, a second end of the second low-frequency filter is electrically connected with a first end of the fifth resistor, and the second end of the fifth resistor is electrically connected with the RF pin of the RCBT-63+ chip.
Further, before the LMX2581 chip is started, the following operations are performed.
Ensuring the normal range of Vcc power supply;
ensuring that an OSCin pin external reference clock is valid;
RESET set in configuration register R5;
sequential configuration registers R15, R13, R10, R9, R8, R7, R6, R5, R4, R3, R2, R1, and R0;
continue to configure R0 to change frequency, or follow the recommended configuration flow.
Compared with the prior art, the intermediate frequency generation device based on ARM control has the following advantages: the intermediate frequency generating device based on ARM control can better mix frequency based on the relevant theory of local oscillation control. And the ARM technology is utilized to meet the processing efficiency of the signals. Different local oscillator frequency signals can be generated quickly. And can be switched quickly as required. The method can be applied to radio signal processing, can also be applied to the field of radio communication by combining other basic radio processing technologies, and has good application prospect.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of an intermediate frequency generation apparatus based on ARM control according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a mixer in an ARM control-based if generating device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a local oscillation frequency generator in an intermediate frequency generation device based on ARM control according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 is a schematic structural diagram of an ARM control based intermediate frequency generation apparatus according to an embodiment of the present invention, and referring to fig. 1, the ARM control based intermediate frequency generation apparatus includes:
a receiving antenna for receiving the acquired signal;
a local oscillator frequency generator for providing a local oscillator frequency, the local oscillator frequency generator comprising: local oscillator control module and local oscillator frequency generation module, local oscillator control module includes: ARM, the local oscillator frequency generation module includes: an LMX2581 chip;
and the mixer is used for mixing and filtering the signals received and collected by the receiving antenna and the local oscillator frequency provided by the local oscillator frequency generator, then amplifying the filtered signals, and then performing power filtering after amplification to generate the required intermediate frequency and power. Wherein, the initial signal is directly collected by the antenna receiving signal, and the collection frequency is generally 1090 MHz. The local oscillation control is controlled by an ARM through a program to generate corresponding frequency. The signals received by the antenna and the signals generated by the local oscillator are mixed by the mixer to generate intermediate frequency signals.
In this embodiment, the mixers may be connected to the receiving antenna and the local oscillator frequency generator, respectively. For final synthesis of the mixed signal. Fig. 2 is a schematic structural diagram of a mixer in an ARM control-based intermediate frequency generation apparatus according to an embodiment of the present invention, referring to fig. 2, the mixer may include: and the RF & DC pin of the RCBT-63+ chip is electrically connected with the receiving antenna, and the RF pin of the RCBT-63+ chip is electrically connected with the local frequency generator. Further, the mixer further comprises: and the NC1, NC2 and NC3 pins of the RCBT-63+ chip are electrically connected with the electric connection terminal respectively. RCBT-63+ can be powered by a filtered power supply. Illustratively, the filtering power supply may include: the first capacitor, the second capacitor and the third capacitor are connected in parallel, one end of the first capacitor, the second capacitor and the third capacitor is electrically connected with a DC power supply, and the other end of the first capacitor, the second capacitor and the third capacitor is electrically connected with a grounding end.
The LMX2581 chip is a core component of the local frequency generator in the present embodiment, which is a wideband frequency synthesizer with an integrated VCO. LMX2581 is a low noise wideband frequency synthesizer that integrates a delta-sigma fractional-N PLL, a multi-core VCO, a programmable output frequency divider, and two differential output buffers. The VCO has a frequency in the range of 1880MHz to 3760MHz and can either be sent directly to the output buffer or can be divided in the range of 2 to 38. Each buffer is capable of providing an output power in the range of-3 dBm to +12dBm at a frequency of 2700 MHz. The device is integrated with a low noise LDO for achieving excellent noise immunity and stability. It may be configured through a similar SPI serial interface. The user can optimize his performance by programming. In fractional mode, both the denominator and the modulator order can be programmed, and jitter can also be configured. The user can also specify the VCO core directly or bypass the internal VCO entirely. Finally, the device also contains many convenient functions such as power down, quick lock, auto-mute, and lock detect. All registers are programmable through a simple 3-wire interface and also provide a read back function. LMX2581 operates from a 3.3V single power supply and employs a 32 pin 5.0mm x 5.0mm ultra thin quad flat no lead (WQFN) package.
In the present embodiment, the DATA, CLK and LE pins of the LMX2581 chip are electrically connected to the ARM. The configuration can be performed by using the pins for writing data into the LMX2581 chip. The purpose of flexibly inputting the local oscillation frequency according to the frequency of the intermediate frequency signal is achieved. Fig. 3 is a schematic structural diagram of a local oscillator frequency generator in an ARM control based intermediate frequency generation apparatus according to an embodiment of the present invention, and referring to fig. 3, the local oscillator frequency generator may further include, in addition to an LMX2581 chip and an ARM: the oscillator comprises a fourth capacitor, a fifth capacitor, a first resistor, a second resistor and a third point resistor, wherein an OSC pin of the MX2581 chip is electrically connected with a first end of the fifth capacitor, a second end of the fifth capacitor is electrically connected with a first end of the third resistor, a second end of the third resistor is respectively electrically connected with second ends of the first resistor and the second resistor, a first end of the first resistor is connected with a reference clock signal, and a first end of the second resistor is electrically connected with a grounding end.
Through the mode, an accurate reference clock signal can be input into the LMX2581 core, so that the evaluation rate of the output local oscillator signal is more accurate.
In addition, the local oscillation frequency generation module further includes: the circuit comprises a sixth capacitor, a fourth resistor, a seventh capacitor, an eighth capacitor, a fifth resistor, a high-pass filter, a first low-pass filter, a second low-pass filter and a radio-frequency amplifier;
the RF-OUTA-pin of the LMX2581 chip is electrically connected to the first terminal of the sixth capacitor, a second end of the sixth capacitor is electrically connected to the first end of the high-pass filter, a second end of the high-pass filter is electrically connected to the first end of the fourth resistor, a second end of the fourth resistor is electrically connected with a first end of the first low-pass filter, a second end of the first low-pass filter is electrically connected with a first end of the seventh capacitor, the second end of the seventh capacitor is electrically connected with the input end of the radio frequency amplifier, the output end of the radio frequency amplifier is electrically connected with the first end of the eighth capacitor, a second end of the eighth capacitor is electrically connected with a first end of a second low-frequency filter, a second end of the second low-frequency filter is electrically connected with a first end of the fifth resistor, and the second end of the fifth resistor is electrically connected with the RF pin of the RCBT-63+ chip. Through the arrangement, the local oscillation signal input to the RCBT-63+ chip can meet the requirement on the local oscillation signal through various filtering. In addition, before the LMX2581 chip is started, the LMX2581 chip needs to be initialized, and this can be implemented, for example, as follows: ensuring the normal range of Vcc power supply ensures that the external reference clock of the OSCin pin effectively configures the RESET set in the register R5; the sequential configuration registers R15, R13, R10, R9, R8, R7, R6, R5, R4, R3, R2, R1, and R0 continue to configure R0 to change frequency, or to configure the flow as recommended.
The intermediate frequency generation device based on ARM control described in this embodiment can better mix frequency based on the relevant theory of local oscillation control. And the ARM technology is utilized to meet the processing efficiency of the signals. Different local oscillator frequency signals can be generated quickly. And can be switched quickly as required. The method can be applied to radio signal processing, can also be applied to the field of radio communication by combining other basic radio processing technologies, and has good application prospect.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. An intermediate frequency generation device based on ARM control, the device comprising:
a receiving antenna for receiving the acquired signal;
a local oscillator frequency generator for providing a local oscillator frequency, the local oscillator frequency generator comprising: local oscillator control module and local oscillator frequency generation module, local oscillator control module includes: ARM, the local oscillator frequency generation module includes: an LMX2581 chip;
and the mixer is used for mixing and filtering the signals received and collected by the receiving antenna and the local oscillator frequency provided by the local oscillator frequency generator, then amplifying the filtered signals, and then performing power filtering after amplification to generate the required intermediate frequency and power.
2. The apparatus of claim 1, wherein the mixer comprises: and the RF & DC pin of the RCBT-63+ chip is electrically connected with the receiving antenna, and the RF pin of the RCBT-63+ chip is electrically connected with the local frequency generator.
3. The apparatus of claim 2, wherein the mixer further comprises: and the NC1, NC2 and NC3 pins of the RCBT-63+ chip are electrically connected with the electric connection terminal respectively.
4. The apparatus of claim 3, wherein the DC pin of the RCBT-63+ chip is electrically connected to a filter power supply.
5. The apparatus of claim 5, wherein the filtered power supply comprises:
the first capacitor, the second capacitor and the third capacitor are connected in parallel, one end of the first capacitor, the second capacitor and the third capacitor is electrically connected with a DC power supply, and the other end of the first capacitor, the second capacitor and the third capacitor is electrically connected with a grounding end.
6. The apparatus of claim 5, wherein the DATA, CLK, and LE pins of the LMX2581 chip are electrically connected to the ARM.
7. The apparatus of claim 6, wherein the local oscillation frequency generation module further comprises: the oscillator comprises a fourth capacitor, a fifth capacitor, a first resistor, a second resistor and a third point resistor, wherein an OSC pin of the MX2581 chip is electrically connected with a first end of the fifth capacitor, a second end of the fifth capacitor is electrically connected with a first end of the third resistor, a second end of the third resistor is respectively electrically connected with second ends of the first resistor and the second resistor, a first end of the first resistor is connected with a reference clock signal, and a first end of the second resistor is electrically connected with a grounding end.
8. The apparatus of claim 7, wherein the local oscillation frequency generation module further comprises: the circuit comprises a sixth capacitor, a fourth resistor, a seventh capacitor, an eighth capacitor, a fifth resistor, a high-pass filter, a first low-pass filter, a second low-pass filter and a radio-frequency amplifier;
the RF-OUTA-pin of the LMX2581 chip is electrically connected to the first terminal of the sixth capacitor, a second end of the sixth capacitor is electrically connected to the first end of the high-pass filter, a second end of the high-pass filter is electrically connected to the first end of the fourth resistor, a second end of the fourth resistor is electrically connected with a first end of the first low-pass filter, a second end of the first low-pass filter is electrically connected with a first end of the seventh capacitor, the second end of the seventh capacitor is electrically connected with the input end of the radio frequency amplifier, the output end of the radio frequency amplifier is electrically connected with the first end of the eighth capacitor, a second end of the eighth capacitor is electrically connected with a first end of a second low-frequency filter, a second end of the second low-frequency filter is electrically connected with a first end of the fifth resistor, and the second end of the fifth resistor is electrically connected with the RF pin of the RCBT-63+ chip.
9. The apparatus of claim 8, wherein the following is done prior to the LMX2581 chip prior to start-up;
ensuring the normal range of Vcc power supply;
ensuring that an OSCin pin external reference clock is valid;
RESET set in configuration register R5;
sequential configuration registers R15, R13, R10, R9, R8, R7, R6, R5, R4, R3, R2, R1, and R0;
continue to configure R0 to change frequency, or follow the recommended configuration flow.
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| CN202111633819.8A CN114337696A (en) | 2021-12-29 | 2021-12-29 | Intermediate frequency generating device based on ARM control |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928664A (en) * | 2012-11-01 | 2013-02-13 | 南京国睿安泰信科技股份有限公司 | System for realizing full-band scanning of frequency spectrograph through point-by-point phase locking |
| CN104635062A (en) * | 2015-01-23 | 2015-05-20 | 北京邮电大学 | Environment electromagnetic radiation monitoring system |
| WO2018157340A1 (en) * | 2017-03-02 | 2018-09-07 | 深圳市台电实业有限公司 | Infrared receiver and infrared simultaneous interpretation system |
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- 2021-12-29 CN CN202111633819.8A patent/CN114337696A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928664A (en) * | 2012-11-01 | 2013-02-13 | 南京国睿安泰信科技股份有限公司 | System for realizing full-band scanning of frequency spectrograph through point-by-point phase locking |
| CN104635062A (en) * | 2015-01-23 | 2015-05-20 | 北京邮电大学 | Environment electromagnetic radiation monitoring system |
| WO2018157340A1 (en) * | 2017-03-02 | 2018-09-07 | 深圳市台电实业有限公司 | Infrared receiver and infrared simultaneous interpretation system |
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