CN210867603U - Low noise amplifier for frequency selection of full frequency band - Google Patents
Low noise amplifier for frequency selection of full frequency band Download PDFInfo
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- CN210867603U CN210867603U CN201922365480.2U CN201922365480U CN210867603U CN 210867603 U CN210867603 U CN 210867603U CN 201922365480 U CN201922365480 U CN 201922365480U CN 210867603 U CN210867603 U CN 210867603U
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Abstract
The utility model discloses a low noise amplifier for frequency selection of full frequency band, which comprises a signal input end, a first frequency selection circuit, a second frequency selection circuit and a third frequency selection circuit, wherein one end of the first frequency selection circuit and one end of the second frequency selection circuit are respectively electrically connected with the signal input end, the output end of the first frequency selection circuit is electrically connected with the output end of the second frequency selection circuit, the input UHF/VHF signal outputs a first frequency selection signal through the first frequency selection circuit, outputs a second frequency selection signal through the second frequency selection circuit, filters out signals with irrelevant frequency, then the first frequency selection signal and the second frequency selection signal are mixed, then frequency selection is carried out again through the third frequency selection circuit to obtain signals of required frequency band, finally, the signals of the frequency band are amplified through the amplifying circuit, and the low noise amplifier has the advantages of stable signals, and the loss of the signal is reduced through the amplifying circuit.
Description
Technical Field
The utility model relates to a basic electronic circuit field, more specifically the low noise amplifier who carries out frequency selection to full frequency channel that says so relates to one kind.
Background
The amplifier is a device capable of amplifying the voltage or power of input signal, and is composed of electronic tube or transistor, power supply transformer and other electric elements, and can be used in various devices of communication, broadcasting, radar, TV and automatic control, etc. according to the physical quantity of processed signal, the amplifier can be divided into mechanical amplifier, electromechanical amplifier, electronic amplifier, liquid amplifier and pneumatic amplifier, etc.
UHF refers to radio waves with a wavelength range of 1m-1dm and a frequency of 300-3000MHz, and VHF refers to radio waves with a frequency of 30-300 MHz.
UHF/VHF can take place the loss of signal at the frequency selection in-process, influences the signal quality of output after the frequency selection, and the signal stability of output is relatively poor moreover, and the while is after the frequency selection again, the signal can reduce stability again, and the distortion problem is comparatively serious, if do not pass signal amplification processing, can lead to the signal of output can't reach the operation requirement.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide a low noise amplifier that carries out the frequency selection to full frequency channel for stable signal after the frequency selection enlargies the processing with the signal, makes the signal of output satisfy operation requirement.
In order to achieve the above purpose, the utility model provides a following technical scheme: a low noise amplifier for frequency selection of full frequency band comprises a signal input end, a first frequency selection circuit, a second frequency selection circuit and a third frequency selection circuit, wherein one end of the first frequency selection circuit and one end of the second frequency selection circuit are respectively electrically connected with the signal input end, the output end of the first frequency selection circuit is electrically connected with the output end of the second frequency selection circuit, the other end of the first frequency selection circuit and the other end of the second frequency selection circuit are respectively electrically connected with the third frequency selection circuit, the third frequency selection circuit outputs a first frequency selection signal to the third frequency selection circuit, the second frequency selection circuit outputs a second frequency selection signal to the third frequency selection circuit, the third frequency selection circuit is electrically connected with a signal amplification circuit, the signal amplification circuit is electrically connected with the signal output end, and the third frequency selection circuit performs frequency selection on the first frequency selection signal and the second frequency selection signal, and then the first frequency-selecting signal and the second frequency-selecting signal are subjected to signal amplification processing by the signal amplification circuit and are output from the signal output end.
As a further improvement of the utility model, first frequency-selecting circuit includes a high-pass filter circuit and a low-pass filter circuit, a high-pass filter circuit with a low-pass filter circuit electric connection, signal output part's signal passes through in proper order a high-pass filter circuit with a low-pass filter circuit, output first frequency-selecting signal.
As a further improvement of the present invention, the first high-pass filter circuit includes C1, C2 and C3, one end of C1 is connected with L1W, one end of C2 is connected with L2W, C2 and L2W are connected in parallel at two ends of L1W, one end of C3 is connected with L3W, C3 and L3W are connected in parallel at two ends of L2W, and two ends of L3W are connected in parallel with C4.
As a further improvement, the second frequency-selecting circuit includes a second high-pass filter circuit and a second low-pass filter circuit, the first high-pass filter circuit with the second low-pass filter circuit electric connection, the signal of the signal output part passes through in proper order the second low-pass filter circuit with the second high-pass filter circuit, the output the second frequency-selecting signal.
As a further improvement of the present invention, the third frequency-selecting circuit includes L10W, L11W, and C35, one end of L10W is connected with C37, one end of L11W is connected with C39, L11W and C39 are connected in parallel at two ends of C37, L10W and C37 are connected in parallel at two ends of C35, two ends of L10W are connected in parallel with C36, and two ends of L11W are connected in parallel with C38.
As a further improvement of the present invention, the signal amplifying circuit includes Q3, R22 and C46, the R22 is connected to the emitter of the Q3, both ends of the R22 are connected in parallel to C47, and the C46 is connected to the collector of the Q3 and the emitter of the Q3.
As a further improvement of the present invention, the signal amplifying circuit further includes R21 and C43, one end of R21 is connected to the collector of Q3, the other end of R21 is connected to one end of L8, the other end of L8 is connected to C43, the other end of C43 is connected to the base of Q3, and both ends of C43 are connected in parallel to R19.
The utility model has the advantages that: the utility model discloses the UHF/VHF signal of input is through the first frequency-selecting signal of first frequency-selecting circuit output, through the second frequency-selecting circuit output second frequency-selecting signal, filter the signal of irrelevant frequency, then first frequency-selecting signal and second frequency-selecting signal mix, then frequency-selecting once more through the third frequency-selecting circuit, obtain the signal that needs the frequency channel, pass through signal amplification circuit at last, the signal of this frequency channel is enlargied, and has the signal stabilization, the low advantage of noise, and through amplifier circuit, the loss of signal has been reduced.
Drawings
Fig. 1 is an overall circuit schematic diagram of the present invention;
fig. 2 is a schematic diagram of a circuit block of the present invention;
fig. 3 is a schematic circuit diagram of a first frequency-selecting circuit according to the present invention;
fig. 4 is a schematic circuit diagram of a second frequency-selecting circuit according to the present invention;
fig. 5 is a schematic circuit diagram of a third frequency-selecting circuit according to the present invention;
fig. 6 is a schematic circuit diagram of the middle signal amplifying circuit of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "bottom" and "top," "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
Referring to fig. 1 to 6, a low noise amplifier for selecting a frequency of a full frequency band according to this embodiment includes a signal input terminal, a first frequency selecting circuit, a second frequency selecting circuit and a third frequency selecting circuit, the signal input terminal is a UHF/VHF signal input terminal, one end of the first frequency selecting circuit and one end of the second frequency selecting circuit are electrically connected to the signal input terminal, the output terminal of the first frequency selecting circuit is electrically connected to the output terminal of the second frequency selecting circuit, the other end of the first frequency selecting circuit and the other end of the second frequency selecting circuit are electrically connected to the third frequency selecting circuit, the third first frequency selecting circuit outputs a first frequency selecting signal to the third frequency selecting circuit, the second frequency selecting circuit outputs a second frequency selecting signal to the third frequency selecting circuit, the third frequency selecting circuit is electrically connected to a signal amplifying circuit, the signal amplifying circuit is electrically connected to the signal output terminal, and the third frequency selecting circuit selects a frequency of the first frequency selecting signal and the second frequency selecting signal, then the first frequency-selecting signal and the second frequency-selecting signal are subjected to signal amplification processing through a signal amplification circuit and output from a signal output end.
Referring to fig. 1 and 3, the first frequency selection circuit includes a first high-pass filter circuit and a first low-pass filter circuit, the first high-pass filter circuit includes C1, C2 and C3, one end of C1 is connected with L1W, one end of C2 is connected with L2W, C2 and L2W are connected in parallel at two ends of L1W, one end of C3 is connected with L3W, C3 and L3W are connected in parallel at two ends of L2W, two ends of L3W are connected with C4 in parallel, the first high-pass filter circuit is electrically connected with the first low-pass filter circuit, a signal at a signal output end sequentially passes through the first high-pass filter circuit and the first low-pass filter circuit, a frequency higher than 470MHz in the signal passes through the first high-frequency filter circuit, a frequency lower than 1000MHz in the signal passes through the first low-frequency filter circuit, and a frequency of 470MHz is 1000 MHz.
Referring to fig. 1 and 4, the second frequency selection circuit includes a second high-pass filter circuit and a second low-pass filter circuit, the first high-pass filter circuit is electrically connected to the second low-pass filter circuit, a signal at the signal output end sequentially passes through the second low-pass filter circuit and the second high-pass filter circuit to output a second frequency selection signal, a frequency of the signal lower than 230MHz passes through the second low-frequency filter circuit, a frequency of the signal higher than 174MHz passes through the second high-frequency filter circuit, and a frequency of the second frequency selection signal is 174-230 MHz.
Referring to fig. 1 and 5, the third frequency selection circuit includes L10W, L11W, and C35, one end of L10W is connected with C37, one end of L11W is connected with C39, L11W and C39 are connected in parallel at two ends of C37, L10W and C37 are connected in parallel at two ends of C35, two ends of L10W are connected in parallel with C36, two ends of L11W are connected in parallel with C38, the first frequency selection signal and the second frequency selection signal both enter the third frequency selection circuit for filtering, the frequency of the output first frequency selection signal is 470 and 790MHz, and the frequency of the output second frequency selection signal is 174 and 230 MHz.
Referring to fig. 1 and 6, the signal amplifying circuit includes Q3, R22 and C46, wherein the Q3 is BFU550/XR, the R22 is connected to the emitter of Q3, the two ends of R22 are connected in parallel to C47, and the C46 is connected to the collector of Q3 and the emitter of Q3, so as to compensate the first frequency-selective signal and the second frequency-selective signal and prevent the first frequency-selective signal and the second frequency-selective signal from being distorted due to signal attenuation.
Referring to fig. 1 and 6, the signal amplifying circuit further includes R21 and C43, one end of R21 is connected to the collector of Q3, the other end of R21 is connected to one end of L8, the other end of L8 is connected to C43, the other end of C43 is connected to the base of Q3, and R19 is connected in parallel to two ends of C43 to couple the first frequency selection signal and the second frequency selection signal, so as to maintain the stability of the first frequency selection signal and the second frequency selection signal and reduce the signal loss of the first frequency selection signal and the second frequency selection signal.
The working principle is as follows: the signal input by the signal input end respectively enters a first frequency selection circuit and a second frequency selection circuit for frequency selection, the signal input by the signal input end firstly passes through a first high-frequency filter circuit after entering the first frequency selection circuit, the frequency of the signal with the frequency higher than 470MHz passes through the first high-frequency filter circuit, then passes through a first low-frequency filter circuit, the frequency of the signal with the frequency lower than 1000MHz passes through the first low-frequency filter circuit, then the first frequency selection signal is output, the frequency of the first frequency selection signal is 470 plus 1000MHz, the signal input by the signal input end firstly passes through a second low-frequency filter circuit after entering the second frequency selection circuit, the frequency of the signal with the frequency lower than 230MHz passes through the second low-frequency filter circuit, then passes through the second high-frequency filter circuit, then the second frequency selection signal is output, the frequency of the second frequency selection signal is 174 plus 230MHz, the first frequency selection signal and the second frequency selection signal enter the third frequency selection circuit for filtering, the frequency of the output first frequency selection signal is 470-790MHz, the frequency of the output second frequency selection signal is 174-230MHz, then the first frequency selection signal and the second frequency selection signal are coupled to the base of Q3, the signal amplification circuit performs signal amplification processing, and the signals are output from the signal output end.
Above only the utility model discloses an it is preferred embodiment, the utility model discloses a scope of protection not only limits in above-mentioned embodiment, and the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. The utility model provides a low noise amplifier to full frequency channel carries out frequency selection, includes signal input part, first frequency selection circuit, second frequency selection circuit and third frequency selection circuit, its characterized in that: one end of the first frequency selecting circuit and one end of the second frequency selecting circuit are respectively electrically connected with the signal input end, the output end of the first frequency selecting circuit is electrically connected with the output end of the second frequency selecting circuit, the other end of the first frequency selecting circuit and the other end of the second frequency selecting circuit are respectively electrically connected with the third frequency selecting circuit, the first frequency selecting circuit outputs a first frequency selecting signal to the third frequency selecting circuit, the second frequency selecting circuit outputs a second frequency selecting signal to the third frequency selecting circuit, the third frequency selecting circuit is electrically connected with a signal amplifying circuit, the signal amplifying circuit is electrically connected with the signal output end, the third frequency selecting circuit performs frequency selection on the first frequency selecting signal and the second frequency selecting signal, and then the first frequency selecting signal and the second frequency selecting signal are subjected to signal amplification processing by the signal amplifying circuit, and is output from the signal output terminal.
2. A low noise amplifier for frequency selecting a full frequency band as defined in claim 1, wherein: the first frequency selection circuit comprises a first high-pass filter circuit and a first low-pass filter circuit, the first high-pass filter circuit is electrically connected with the first low-pass filter circuit, and a signal of the signal output end sequentially passes through the first high-pass filter circuit and the first low-pass filter circuit to output the first frequency selection signal.
3. A low noise amplifier for frequency selecting a full frequency band according to claim 2, wherein: the first high-pass filter circuit comprises C1, C2 and C3, one end of C1 is connected with L1W, one end of C2 is connected with L2W, C2 and L2W are connected in parallel at two ends of L1W, one end of C3 is connected with L3W, C3 and L3W are connected in parallel at two ends of L2W, and two ends of L3W are connected in parallel with C4.
4. A low noise amplifier for frequency selecting a full frequency band according to claim 2, wherein: the second frequency selection circuit comprises a second high-pass filter circuit and a second low-pass filter circuit, the first high-pass filter circuit is electrically connected with the second low-pass filter circuit, and the signal of the signal output end sequentially passes through the second low-pass filter circuit and the second high-pass filter circuit to output the second frequency selection signal.
5. A low noise amplifier for frequency selecting a full frequency band as defined in claim 1, wherein: the third frequency selection circuit comprises L10W, L11W and C35, wherein one end of L10W is connected with C37, one end of L11W is connected with C39, L11W and C39 are connected in parallel at two ends of C37, L10W and C37 are connected in parallel at two ends of C35, two ends of L10W are connected in parallel with C36, and two ends of L11W are connected in parallel with C38.
6. A low noise amplifier for frequency selecting a full frequency band as defined in claim 1, wherein: the signal amplifying circuit comprises Q3, R22 and C46, wherein the R22 is connected with the emitter of the Q3, the two ends of the R22 are connected with C47 in parallel, and the C46 is connected with the collector of the Q3 and the emitter of the Q3.
7. The low noise amplifier of claim 6, wherein the frequency selection unit is configured to select the full frequency band by: the signal amplification circuit further comprises R21 and C43, one end of R21 is connected with the collector of Q3, the other end of R21 is connected with one end of L8, the other end of L8 is connected with C43, the other end of C43 is connected with the base of Q3, and two ends of C43 are connected with R19 in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922365480.2U CN210867603U (en) | 2019-12-25 | 2019-12-25 | Low noise amplifier for frequency selection of full frequency band |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922365480.2U CN210867603U (en) | 2019-12-25 | 2019-12-25 | Low noise amplifier for frequency selection of full frequency band |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210867603U true CN210867603U (en) | 2020-06-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922365480.2U Expired - Fee Related CN210867603U (en) | 2019-12-25 | 2019-12-25 | Low noise amplifier for frequency selection of full frequency band |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210867603U (en) |
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2019
- 2019-12-25 CN CN201922365480.2U patent/CN210867603U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200626 |
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| CF01 | Termination of patent right due to non-payment of annual fee |