CN210297650U - Small signal long-distance transmission system - Google Patents
Small signal long-distance transmission system Download PDFInfo
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- CN210297650U CN210297650U CN201921372131.7U CN201921372131U CN210297650U CN 210297650 U CN210297650 U CN 210297650U CN 201921372131 U CN201921372131 U CN 201921372131U CN 210297650 U CN210297650 U CN 210297650U
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Abstract
The utility model provides a small-signal remote transmission system, include: a power amplifying circuit and a temperature compensating circuit; the working voltages of the power amplifying circuit and the temperature compensating circuit are accessed from the outside; the input end of the power amplification circuit is connected with a small signal to be amplified; and the output end of the temperature compensation circuit is connected with the power amplification circuit. The utility model discloses a chip such as amplifier, power amplifier tube increases the power gain of signal, adopts the temperature compensation circuit to compensate the temperature drift phenomenon that produces because of the power heat production again to can provide sufficient energy for the remote transmission of small signal, solved the small signal decay problem in remote transmission.
Description
Technical Field
The utility model relates to a small signal remote transmission system especially relates to a transmission system of high gain.
Background
In a wireless transmission system, a small-signal long-distance transmission system is most widely applied, and the technical development is also most mature.
At present, small-signal remote transmission systems are more and more widely applied to various mechanisms such as communication, electric power, military command and the like, and play an important role in providing shared information, decision support and situation display. However, the most basic function of the small-signal long-distance transmission system is to amplify the signal on the premise of the small signal so as to avoid signal attenuation in the process of long-distance transmission of the signal, which provides convenience for transmission of the small signal.
Since the signal power of small signal transmission is generally small, the signal attenuation is very serious in the process of long-distance transmission, so that the signal received by the signal receiving end has a large error. At present, the transmission distance in the similar small signal transmission systems is not far, mainly the power gain in the small signal transmission systems is not high enough, so the transmission distance of the signal is limited by the limitation of the power gain, if the signal is transmitted for a long distance under the condition that the power gain cannot be reached, the signal is greatly attenuated, and the signal received by a receiving end is incorrect.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention is directed to a small signal long-distance transmission system, which is used to solve the problem of the prior art that the power gain in the small signal transmission system is not high enough to limit the transmission distance.
To achieve the above and other related objects, the present invention provides a small signal remote transmission system, including: a power amplifying circuit and a temperature compensating circuit;
the working voltages of the power amplification circuit and the temperature compensation circuit are both externally connected;
the input end of the power amplification circuit is connected with a small signal to be amplified;
and the output end of the temperature compensation circuit is connected with the power amplification circuit.
In an embodiment of the present invention, the power amplifying circuit includes a first pi type attenuator unit, a signal amplifying unit, a second pi type attenuator unit, and a power amplifying unit.
In an embodiment of the present invention, the first pi-type attenuator unit includes resistors R1, R2, and R3;
one end of the resistor R1 is connected with a small signal to be amplified and one end of the resistor R2, and the other end of the resistor R1 is connected with GND;
the other end of the resistor R2 is connected with one end of the resistor R3 and the input end of the signal amplifying unit, and the other end of the resistor R3 is connected with GND.
In an embodiment of the present invention, the signal amplifying unit includes an amplifier U1, a resistor R4, an inductor L1, and a plurality of capacitors;
one end of a capacitor C1 is connected with the output end of the first pi-type attenuator unit, the other end of the capacitor C1 is connected with the signal input end of an amplifier U1, the signal output end of an amplifier U1 is connected with one end of an inductor L1 and one end of a capacitor C7, and the other end of a capacitor C7 is connected with the input end of the second pi-type attenuator unit; the resistor R4 is connected with the inductor L1 in series, the capacitor C2 is connected with the capacitor C3 in parallel, and the capacitor C4, the capacitor C5 and the capacitor C6 are connected with each other in parallel; one end of the capacitor C2 and the capacitor C3 which are connected in parallel is connected with the middle node of the resistor R4 and the inductor L1, and the other end of the capacitor C2 and the capacitor C3 which are connected in parallel is grounded; one end of the capacitor C4, the capacitor C5 and the capacitor C6 are connected in parallel with the other end of the resistor R4 and + VCC1, and the other end is grounded after being connected in parallel.
In an embodiment of the present invention, the second pi-type attenuator unit includes resistors R5, R6, and R7;
one end of the resistor R5 is connected with the output end of the signal amplification unit and one end of the resistor R6, and the other end of the resistor R5 is connected with GND;
the other end of the resistor R6 is connected with one end of the resistor R7 and the input end of the power amplification unit, and the other end of the resistor R3 is connected with GND.
In an embodiment of the present invention, the power amplifying unit includes a power amplifier U2 and a plurality of capacitors;
the output end of the second pi-type attenuator unit is input into a 1 st pin of a power amplifier U2 after passing through a capacitor C8, a 2 nd pin of the power amplifier U2 is connected with the output end of the temperature compensation circuit and one end of a capacitor C9, and the other end of the capacitor C9 is connected with GND; the 3 rd pin of the power amplifier U2 is connected with one end of + VCC1 and a capacitor C10, and the other end of the capacitor C10 is connected with GND; the 4 th pin of the power amplifier U2 outputs the amplified small signal through the capacitor C11, and the 5 th pin of the power amplifier U2 is connected to GND.
In an embodiment of the present invention, the temperature compensation circuit includes a temperature compensation unit and a dc conversion unit; the + VCC1 output by the power circuit is connected with one end of a resistor R8, and the other end of the resistor R8 is respectively connected with a temperature compensation unit and a direct current conversion unit.
In an embodiment of the present invention, the temperature compensation unit includes a voltage regulator U3, a transistor Q1, a plurality of resistors, and a plurality of capacitors;
the other end of the resistor R8 is connected with one end of the capacitor C12 and the 3 rd pin of the voltage regulator tube U3; the resistor R9 and the resistor R10 are connected in series, the middle node after the series connection is connected with the base electrode of the triode Q1, the other end of the resistor R9 is connected with the 2 nd pin of the voltage regulator tube U3 and the collector electrode of the triode Q1, and the 2 nd pin of the voltage regulator tube U3 is connected with GND through the capacitor C13; the other end of the resistor R10 is connected with one end of a resistor R11, an emitter of the triode Q1 and GND; a 1 st pin of the voltage regulator tube U3 is connected with one end of a capacitor C14 and one end of a resistor R12, and the other end of the capacitor C14 is connected with GND; the other end of the resistor R12 is connected with one end and an adjusting end of the adjustable resistor W1, the other end of the adjustable resistor W1 is connected with one end of the resistor R13 and one end of the resistor R14, the other end of the resistor R13 is connected with GND, the other end of the resistor R14 is connected with one end of the capacitor C15 and the input end of the DC conversion unit, and the other end of the capacitor C15 is connected with GND.
In an embodiment of the present invention, the dc conversion unit includes a voltage regulator U4, a dc converter U5, a resistor R15, a capacitor C16, and a capacitor C17;
the other end of the resistor R8 is connected with one end of a capacitor C16 and a 3 rd pin of a voltage regulator tube U4, a 2 nd pin of the voltage regulator tube U4 is connected with GND, a 1 st pin of the voltage regulator tube U4 is connected with one end of a capacitor C17 and one end of a resistor R15, and the other end of the capacitor C17 is connected with GND; the other end of the resistor R15 is connected with the 1 st pin and the 3 rd pin of the DC converter U5; the 2 nd pin of the direct current converter U5 is connected with the output end of the temperature compensation unit; the 1 st pin of the direct current converter U5 is connected with an external control signal; the 5 th pin of the direct current converter U5 is connected with GND; the 4 th pin and the 6 th pin of the direct current converter U5 are connected and then connected with a power amplifying circuit.
As above, the utility model discloses a small-signal remote transmission system has following beneficial effect: the utility model discloses a chip such as amplifier, power amplifier tube increases the power gain of signal, adopts the temperature compensation circuit to compensate the temperature drift phenomenon that produces because of the power heat production again to can provide sufficient energy for the remote transmission of small signal, solved the small signal decay problem in remote transmission.
Drawings
Fig. 1 is a schematic view of the structure of the present invention.
Fig. 2 is a schematic diagram of a power amplifier circuit according to the present invention.
Fig. 3 is a schematic diagram of the temperature compensation circuit according to the present invention.
Description of the element reference numerals
1-a power amplification circuit; 2-a temperature compensation circuit;
101-a first pi-type attenuator unit; 102-a signal amplification unit; 103-a second pi-type attenuator unit;
104-a power amplification unit; 201-temperature compensation unit; 202-a direct current conversion unit.
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
Please refer to fig. 1 to 3. It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.
Referring to fig. 1, the present invention provides a small signal remote transmission system, including: a power amplifier circuit 1 and a temperature compensation circuit 2.
The working voltages of the power amplifier circuit 1 and the temperature compensation circuit 2 are all externally connected, and + VCC1 in this embodiment is + 12V.
Referring to fig. 2, the power amplifier circuit 1 includes a first pi-type attenuator unit 101, a signal amplifier unit 102, a second pi-type attenuator unit 103, and a power amplifier unit 104. The preamplifier of the signal amplification unit 102 is MGA-30889, and the power amplifier of the power amplification unit 104 is RAO8H 1317M.
In this embodiment, the range of the small signal to be amplified is 136MHz to 175MHz, the small signal is input to the first pi-type attenuator unit 101, and the first pi-type attenuator unit 101 is used for attenuating the signal power to prevent the subsequent chip from being damaged and performing impedance matching.
The capacitor C6 of the signal amplification unit 102 filters the small signal and inputs the small signal to a preamplifier for amplification. An externally provided direct current power supply + VCC1 supplies power to the preamplifier after being filtered by a plurality of capacitors, and the inductor L1 has the function of choke.
The amplified small signal is input to the second pi-type attenuator unit 103 after being filtered by the capacitor, and the function of the second pi-type attenuator unit 103 is the same as that of the first pi-type attenuator unit 101.
Finally, the power amplification unit 104 amplifies the power to push the power gain of the small signal to 37dB, so as to carry out long-distance transmission.
The power amplifier tube U2 is sensitive to temperature, and the temperature drift generated needs to be compensated by the temperature compensation circuit 2.
Referring to fig. 3, the temperature compensation circuit includes a temperature compensation unit 201 and a dc conversion unit 202; the voltage stabilizer of the temperature compensation unit 201 adopts 78L05, and the DC converter of the DC conversion unit 202 adopts FDC 6333C.
The temperature compensation unit 201 comprises a voltage regulator U3, an adjustable resistor W1, and an NPN transistor Q1.
The dc conversion unit 202 includes a voltage regulator U3 and a dc converter U5.
The voltage regulator U3 is capable of keeping the input voltage constant when the input voltage, the ambient temperature, etc. change, thereby providing a stable dc power supply for the transistor Q1.
The voltage regulator U4 provides a regulated dc voltage to the dc converter U5. An external control signal is connected to a 1 st pin of the direct current converter U5, when the control signal is in a high level, the direct current converter U5 is closed, and the temperature compensation circuit does not output the control signal; when the control signal is at a low level, the dc converter U5 is turned on, and the dc converter U5 outputs a voltage value to the 2 nd pin of the power amplifier U2 to compensate the temperature drift generated by the power amplifier U2. By adjusting the adjustable resistor W1, the input voltage of the 2 nd pin of the DC converter U5 can be adjusted, the current in the circuit is limited below 1.3A, and therefore the temperature compensation circuit is controlled.
To sum up, the utility model discloses a chip such as amplifier, power amplifier tube increases the power gain of signal, adopts the temperature compensation circuit to compensate the temperature drift phenomenon that produces because of the power heat production again to can provide sufficient energy for the remote transmission of small signal, solved the small signal decay problem in remote transmission. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. A small signal long range transmission system comprising: a power amplifying circuit and a temperature compensating circuit;
the working voltages of the power amplification circuit and the temperature compensation circuit are both externally connected;
the input end of the power amplification circuit is connected with a small signal to be amplified;
and the output end of the temperature compensation circuit is connected with the power amplification circuit.
2. A small-signal long-distance transmission system according to claim 1, characterized in that: the power amplification circuit comprises a first pi-type attenuator unit, a signal amplification unit, a second pi-type attenuator unit and a power amplification unit.
3. A small-signal long-distance transmission system according to claim 2, characterized in that: the first pi-type attenuator unit comprises resistors R1, R2 and R3;
one end of the resistor R1 is connected with a small signal to be amplified and one end of the resistor R2, and the other end of the resistor R1 is connected with GND;
the other end of the resistor R2 is connected with one end of the resistor R3 and the input end of the signal amplifying unit, and the other end of the resistor R3 is connected with GND.
4. A small-signal long-distance transmission system according to claim 2, characterized in that: the signal amplification unit comprises an amplifier U1, a resistor R4, an inductor L1 and a plurality of capacitors;
one end of a capacitor C1 is connected with the output end of the first pi-type attenuator unit, the other end of the capacitor C1 is connected with the signal input end of an amplifier U1, the signal output end of an amplifier U1 is connected with one end of an inductor L1 and one end of a capacitor C7, and the other end of a capacitor C7 is connected with the input end of the second pi-type attenuator unit; the resistor R4 is connected with the inductor L1 in series, the capacitor C2 is connected with the capacitor C3 in parallel, and the capacitor C4, the capacitor C5 and the capacitor C6 are connected with each other in parallel; one end of the capacitor C2 and the capacitor C3 which are connected in parallel is connected with the middle node of the resistor R4 and the inductor L1, and the other end of the capacitor C2 and the capacitor C3 which are connected in parallel is grounded; one end of the capacitor C4, the capacitor C5 and the capacitor C6 are connected in parallel with the other end of the resistor R4 and + VCC1, and the other end is grounded after being connected in parallel.
5. A small-signal long-distance transmission system according to claim 2, characterized in that: the second pi-type attenuator unit comprises resistors R5, R6 and R7;
one end of the resistor R5 is connected with the output end of the signal amplification unit and one end of the resistor R6, and the other end of the resistor R5 is connected with GND;
the other end of the resistor R6 is connected with one end of the resistor R7 and the input end of the power amplification unit, and the other end of the resistor R3 is connected with GND.
6. A small-signal long-distance transmission system according to claim 2, characterized in that: the power amplification unit comprises a power amplifier U2 and a plurality of capacitors;
the output end of the second pi-type attenuator unit is input into a 1 st pin of a power amplifier U2 after passing through a capacitor C8, a 2 nd pin of the power amplifier U2 is connected with the output end of the temperature compensation circuit and one end of a capacitor C9, and the other end of the capacitor C9 is connected with GND;
the 3 rd pin of the power amplifier U2 is connected with one end of + VCC1 and a capacitor C10, and the other end of the capacitor C10 is connected with GND; the 4 th pin of the power amplifier U2 outputs the amplified small signal through the capacitor C11, and the 5 th pin of the power amplifier U2 is connected to GND.
7. A small-signal long-distance transmission system according to claim 1, characterized in that: the temperature compensation circuit comprises a temperature compensation unit and a direct current conversion unit; the + VCC1 output by the power circuit is connected with one end of a resistor R8, and the other end of the resistor R8 is respectively connected with a temperature compensation unit and a direct current conversion unit.
8. A small-signal long-distance transmission system according to claim 7, characterized in that: the temperature compensation unit comprises a voltage regulator tube U3, a triode Q1, a plurality of resistors and a plurality of capacitors;
the other end of the resistor R8 is connected with one end of the capacitor C12 and the 3 rd pin of the voltage regulator tube U3; the resistor R9 and the resistor R10 are connected in series, the middle node after the series connection is connected with the base electrode of the triode Q1, the other end of the resistor R9 is connected with the 2 nd pin of the voltage regulator tube U3 and the collector electrode of the triode Q1, and the 2 nd pin of the voltage regulator tube U3 is connected with GND through the capacitor C13; the other end of the resistor R10 is connected with one end of a resistor R11, an emitter of the triode Q1 and GND; a 1 st pin of the voltage regulator tube U3 is connected with one end of a capacitor C14 and one end of a resistor R12, and the other end of the capacitor C14 is connected with GND; the other end of the resistor R12 is connected with one end and an adjusting end of the adjustable resistor W1, the other end of the adjustable resistor W1 is connected with one end of the resistor R13 and one end of the resistor R14, the other end of the resistor R13 is connected with GND, the other end of the resistor R14 is connected with one end of the capacitor C15 and the input end of the DC conversion unit, and the other end of the capacitor C15 is connected with GND.
9. A small-signal long-distance transmission system according to claim 7, characterized in that: the direct current conversion unit comprises a voltage regulator tube U4, a direct current converter U5, a resistor R15, a capacitor C16 and a capacitor C17;
the other end of the resistor R8 is connected with one end of a capacitor C16 and a 3 rd pin of a voltage regulator tube U4, a 2 nd pin of the voltage regulator tube U4 is connected with GND, a 1 st pin of the voltage regulator tube U4 is connected with one end of a capacitor C17 and one end of a resistor R15, and the other end of the capacitor C17 is connected with GND; the other end of the resistor R15 is connected with the 1 st pin and the 3 rd pin of the DC converter U5; the 2 nd pin of the direct current converter U5 is connected with the output end of the temperature compensation unit; the 1 st pin of the direct current converter U5 is connected with an external control signal; the 5 th pin of the direct current converter U5 is connected with GND; the 4 th pin and the 6 th pin of the direct current converter U5 are connected and then connected with a power amplifying circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921372131.7U CN210297650U (en) | 2019-08-22 | 2019-08-22 | Small signal long-distance transmission system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921372131.7U CN210297650U (en) | 2019-08-22 | 2019-08-22 | Small signal long-distance transmission system |
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| CN210297650U true CN210297650U (en) | 2020-04-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114362769A (en) * | 2021-12-16 | 2022-04-15 | 成都航天通信设备有限责任公司 | Ultra-short wave transmitter emission overshoot compensation circuit and working method thereof |
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2019
- 2019-08-22 CN CN201921372131.7U patent/CN210297650U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114362769A (en) * | 2021-12-16 | 2022-04-15 | 成都航天通信设备有限责任公司 | Ultra-short wave transmitter emission overshoot compensation circuit and working method thereof |
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