CN216252689U - Controllable frequency source circuit and device - Google Patents
Controllable frequency source circuit and device Download PDFInfo
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- CN216252689U CN216252689U CN202122764850.7U CN202122764850U CN216252689U CN 216252689 U CN216252689 U CN 216252689U CN 202122764850 U CN202122764850 U CN 202122764850U CN 216252689 U CN216252689 U CN 216252689U
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Abstract
The utility model discloses a controllable frequency source circuit and a device, which comprise a frequency input unit, a frequency display unit, a control unit, a signal conversion unit, a frequency forming unit and a low-pass filtering unit, wherein the control unit is electrically connected with the frequency input unit and the frequency display unit, and the signal conversion unit is electrically connected with the control unit; the frequency forming unit is electrically connected with the signal conversion unit and used for providing a first signal; the low-pass filtering unit is electrically connected with the frequency forming unit and used for providing a second signal, wherein the frequencies of the first signal and the second signal are not equal. The utility model has the advantages of simple structure, low cost and simple debugging.
Description
Technical Field
The present invention relates to the field of frequency source technologies, and in particular, to a controllable frequency source circuit and a controllable frequency source device.
Background
A frequency source is a widely used component in electrical circuits, which functions to provide accurate clock signals to various devices, playing an important role in modern electronic communication systems. At present, the frequency source develops towards the performance indexes of broadband, rapid change and low phase noise, and particularly in the fields of electronic countermeasure, radar systems, instruments and meters and radio frequency microwaves, a high-performance frequency source is needed. The most important technical method of a frequency source is a frequency synthesis technology, which is to synthesize a new frequency from a reference frequency by a series of frequency conversion methods such as frequency mixing, frequency multiplication or frequency division. For example, a conventional frequency source circuit adopts a ping-pong loop circuit structure, and frequencies output by a plurality of phase-locked loops are mixed with a local oscillator module, so that although a broadband frequency agility source is realized, the circuit structure is complex, debugging is difficult, and cost is high. Therefore, how to develop a low-cost frequency source circuit with a simple circuit structure has become an urgent problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model solves the technical problem of providing a controllable frequency source circuit and a device with low cost and simple circuit structure.
In a first aspect, the present invention provides a controllable frequency source circuit, including a frequency input unit, a frequency display unit, a control unit, a signal conversion unit, a frequency forming unit and a low-pass filtering unit, wherein the control unit is electrically connected to the frequency input unit and the frequency display unit, and the signal conversion unit is electrically connected to the control unit; the frequency forming unit is electrically connected with the signal conversion unit and used for providing a first signal; the low-pass filtering unit is electrically connected with the frequency forming unit and used for providing a second signal, wherein the frequencies of the first signal and the second signal are not equal.
In one embodiment, the low-pass filtering unit includes a first resistor, a first inductor, a first capacitor, a second capacitor, and a third capacitor, a first end of the first resistor is electrically connected to the frequency forming unit, and a second end of the first resistor is grounded; a first end of the first inductor is electrically connected with a first end of the first resistor, and a second end of the first inductor is electrically connected with a first end of the second capacitor; the first end of the first capacitor is electrically connected with the first end of the first resistor, the second end of the first capacitor is grounded, and the second end of the second capacitor is grounded; the first end of the third capacitor is electrically connected with the first end of the first resistor, and the second end of the third capacitor is electrically connected with the second end of the first inductor.
In one embodiment, the low-pass filtering unit further includes a second inductor, a fourth capacitor, and a fifth capacitor, a first end of the second inductor is electrically connected to a second end of the first inductor, a second end of the second inductor is electrically connected to a first end of the fourth capacitor, and a second end of the fourth capacitor is grounded; the first end of the fifth capacitor is electrically connected with the first end of the second inductor, and the second end of the fifth capacitor is electrically connected with the second end of the second inductor.
In one embodiment, the low-pass filtering unit further includes a third inductor, a sixth capacitor, and a seventh capacitor, a first end of the third inductor is electrically connected to a second end of the second inductor, a second end of the third inductor is electrically connected to a first end of the sixth capacitor, and a second end of the sixth capacitor is grounded; the first end of the seventh capacitor is electrically connected with the first end of the third inductor, and the second end of the seventh capacitor is electrically connected with the second end of the third inductor.
In one embodiment, the frequency forming unit includes a first input terminal electrically connected to the signal converting unit and a second input terminal electrically connected to the output terminal of the low-pass filtering unit.
In one embodiment, the frequency forming unit includes a first output terminal and a second output terminal, the first output terminal is electrically connected to the input terminal of the low-pass filtering unit, the second output terminal outputs a square wave signal, and the output terminal of the low-pass filtering unit outputs a sine wave signal.
In one embodiment, the low-pass filtering unit comprises an elliptic function filter.
In one embodiment, the signal conversion unit includes a logic level conversion chip electrically connected to the control unit and the frequency forming unit.
In a second aspect, the present invention also discloses an apparatus comprising the controllable frequency source circuit according to any one of the first aspect.
The utility model has the following beneficial effects: according to the utility model, through the cooperation of the frequency input unit, the frequency display unit, the control unit, the signal conversion unit, the frequency forming unit and the low-pass filtering unit, under the control of the frequency input unit, the signal conversion unit is controlled to output a signal to the frequency forming unit, so that the frequency forming unit generates a first signal, and the low-pass filtering unit also generates a second signal according to the signal output by the frequency forming unit, so that a target device acquires the first signal and the second signal as clock signals. Therefore, the utility model has simple structure, low cost and simple debugging, and can provide abundant clock signals.
Drawings
Fig. 1 is a schematic block diagram of a controllable frequency source circuit of the present invention.
Fig. 2 is a circuit diagram of a low-pass filtering unit of the controllable frequency source circuit according to the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples. It should be noted that, if not conflicting, the embodiments of the present invention and the features of the embodiments may be combined with each other within the scope of protection of the present invention.
Referring to fig. 1 and 2, the present invention provides a controllable frequency source circuit, which includes a frequency input unit 1, a frequency display unit 2, a control unit 3, a signal conversion unit 4, a frequency forming unit 5, and a low-pass filtering unit 6, wherein the control unit 3 is electrically connected to the frequency input unit 1 and the frequency display unit 2, and the signal conversion unit 4 is electrically connected to the control unit 3. The frequency forming unit 5 is electrically connected to the signal converting unit 4 for providing a first signal. The low-pass filtering unit 6 is electrically connected to the frequency forming unit 5, and is configured to provide a second signal, where the frequencies of the first signal and the second signal are not equal.
The frequency input unit 1 may be a touch screen, and the touch screen may be a resistive screen or a capacitive screen, and is not limited herein. The first signal and the second signal may be used to provide a clock signal for a target device. When the frequencies of the first signal and the second signal need to be changed, only the corresponding frequency needs to be input through the touch screen, and the touch screen is convenient for a user to use.
The frequency display unit 2 may be an LED display screen, and the control unit 3 may be a single chip, a Field Programmable Gate Array (FPGA) or a Complex Programmable Logic Device (CPLD), and the like, which is not limited herein. The signal conversion unit 4 is a logic level conversion chip, the logic level conversion chip is electrically connected to the control unit 3 and the frequency forming unit 5, and is configured to convert a 5V logic level signal output by the control unit 3 into a 3.3V logic level signal, so that the two signals are matched. The frequency forming unit 5 is a direct digital frequency synthesizer chip, which may be an AD9850 chip, an AD9851 chip, etc. manufactured by AD corporation in usa, and is not particularly limited herein, and may be selected as needed.
The frequency forming unit 5 includes a first input terminal, a second input terminal, a first output terminal and a second output terminal, the first input terminal is electrically connected to the signal converting unit 4, and the second input terminal is electrically connected to the output terminal of the low-pass filtering unit 6. The first output end is electrically connected with the input end of the low-pass filtering unit 6, the second output end outputs a square wave signal, and the output end of the low-pass filtering unit 6 outputs a sine wave signal, that is, the first signal is a square wave signal, and the second signal is a sine wave signal.
The low-pass filtering unit 6 may be an elliptic function filter or the like. In this embodiment, the low pass filtering unit 6 includes a first resistor R1, a first inductor L1, a first capacitor C1, a second capacitor C2, and a third capacitor C3, a first end of the first resistor R1 is electrically connected to the frequency forming unit 5, and a second end of the first resistor R1 is grounded. A first terminal of the first inductor L1 is electrically connected to a first terminal of the first resistor R1, and a second terminal of the first inductor L1 is electrically connected to a first terminal of the second capacitor C2. The first end of the first capacitor C1 is electrically connected to the first end of the first resistor R1, the second end of the first capacitor C1 is grounded, and the second end of the second capacitor C2 is grounded. A first terminal of the third capacitor C3 is electrically connected to a first terminal of the first resistor R1, and a second terminal of the third capacitor C3 is electrically connected to a second terminal of the first inductor L1.
The low pass filter unit 6 further includes a second inductor L2, a fourth capacitor C4, and a fifth capacitor C5, wherein a first end of the second inductor L2 is electrically connected to a second end of the first inductor L1, a second end of the second inductor L2 is electrically connected to a first end of the fourth capacitor C4, and a second end of the fourth capacitor C4 is grounded. A first terminal of the fifth capacitor C5 is electrically connected to the first terminal of the second inductor L2, and a second terminal of the fifth capacitor C5 is electrically connected to the second terminal of the second inductor L2.
The low pass filter unit 6 further includes a third inductor L3, a sixth capacitor C6 and a seventh capacitor C7, wherein a first terminal of the third inductor L3 is electrically connected to a second terminal of the second inductor L2, a second terminal of the third inductor L3 is electrically connected to a first terminal of the sixth capacitor C6, and a second terminal of the sixth capacitor C6 is grounded. A first terminal of the seventh capacitor C7 is electrically connected to a first terminal of the third inductor L3, and a second terminal of the seventh capacitor C7 is electrically connected to a second terminal of the third inductor L3. After passing through the low-pass filtering unit 6, a relatively pure sine wave signal can be output, thereby reducing the trigger error of a post-stage circuit.
The utility model also discloses a device which comprises the controllable frequency source circuit. It is understood that the apparatus may be a radio station, a radar, a navigation device, other communication devices, etc., and is not limited in particular. By means of the controllable frequency source circuit, a clock signal can then be provided for the device.
In summary, according to the present invention, through cooperation between the frequency input unit 1, the frequency display unit 2, the control unit 3, the signal conversion unit 4, the frequency forming unit 5 and the low-pass filtering unit 6, under the control of the frequency input unit 1, the signal conversion unit 4 is controlled to output a signal to the frequency forming unit 5, so that the frequency forming unit 5 generates a first signal, and the low-pass filtering unit 6 further generates a second signal according to the signal output by the frequency forming unit 5, so that the target device obtains the first signal and the second signal as a clock signal. Therefore, the utility model not only has simple structure and low cost, but also can provide abundant clock signals.
The controllable frequency source circuit provided by the present invention is described in detail above, and the principle and the implementation of the present invention are explained in this document by applying specific examples, and the description of the above examples is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In summary, the present disclosure is only an embodiment of the present disclosure, and not intended to limit the scope of the present disclosure, and all equivalent structures or equivalent flow transformations made by using the present disclosure and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present disclosure, and should not be construed as limiting the present disclosure.
Claims (9)
1. A controllable frequency source circuit is characterized by comprising a frequency input unit, a frequency display unit, a control unit, a signal conversion unit, a frequency forming unit and a low-pass filtering unit, wherein the control unit is electrically connected with the frequency input unit and the frequency display unit, and the signal conversion unit is electrically connected with the control unit; the frequency forming unit is electrically connected with the signal conversion unit and used for providing a first signal; the low-pass filtering unit is electrically connected with the frequency forming unit and used for providing a second signal, wherein the frequencies of the first signal and the second signal are not equal.
2. The controllable frequency source circuit according to claim 1, wherein said low-pass filtering unit comprises a first resistor, a first inductor, a first capacitor, a second capacitor and a third capacitor, a first end of said first resistor is electrically connected to said frequency forming unit, and a second end of said first resistor is grounded; a first end of the first inductor is electrically connected with a first end of the first resistor, and a second end of the first inductor is electrically connected with a first end of the second capacitor; the first end of the first capacitor is electrically connected with the first end of the first resistor, the second end of the first capacitor is grounded, and the second end of the second capacitor is grounded; the first end of the third capacitor is electrically connected with the first end of the first resistor, and the second end of the third capacitor is electrically connected with the second end of the first inductor.
3. The controllable frequency source circuit according to claim 2, wherein said low pass filter unit further comprises a second inductor, a fourth capacitor and a fifth capacitor, a first end of said second inductor is electrically connected to a second end of said first inductor, a second end of said second inductor is electrically connected to a first end of said fourth capacitor, and a second end of said fourth capacitor is grounded; the first end of the fifth capacitor is electrically connected with the first end of the second inductor, and the second end of the fifth capacitor is electrically connected with the second end of the second inductor.
4. The controllable frequency source circuit according to claim 3, wherein the low-pass filtering unit further comprises a third inductor, a sixth capacitor and a seventh capacitor, a first end of the third inductor is electrically connected to a second end of the second inductor, a second end of the third inductor is electrically connected to a first end of the sixth capacitor, and a second end of the sixth capacitor is grounded; the first end of the seventh capacitor is electrically connected with the first end of the third inductor, and the second end of the seventh capacitor is electrically connected with the second end of the third inductor.
5. The controllable frequency source circuit according to claim 1, wherein said frequency forming unit comprises a first input terminal and a second input terminal, said first input terminal is electrically connected to said signal converting unit, said second input terminal is electrically connected to an output terminal of said low pass filtering unit.
6. The controllable frequency source circuit according to claim 1, wherein said frequency forming unit comprises a first output terminal and a second output terminal, said first output terminal is electrically connected to the input terminal of said low-pass filtering unit, said second output terminal outputs a square wave signal, and the output terminal of said low-pass filtering unit outputs a sine wave signal.
7. The controllable frequency source circuit as claimed in claim 1, wherein said low pass filtering unit comprises an elliptic function filter.
8. The controllable frequency source circuit according to claim 1, wherein said signal conversion unit comprises a logic level conversion chip electrically connected to said control unit and said frequency forming unit.
9. An apparatus comprising a controllable frequency source circuit as claimed in any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122764850.7U CN216252689U (en) | 2021-11-10 | 2021-11-10 | Controllable frequency source circuit and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122764850.7U CN216252689U (en) | 2021-11-10 | 2021-11-10 | Controllable frequency source circuit and device |
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| Publication Number | Publication Date |
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| CN216252689U true CN216252689U (en) | 2022-04-08 |
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| CN202122764850.7U Active CN216252689U (en) | 2021-11-10 | 2021-11-10 | Controllable frequency source circuit and device |
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- 2021-11-10 CN CN202122764850.7U patent/CN216252689U/en active Active
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