CN211046873U - Broadband low-noise amplifier circuit and broadband receiver thereof - Google Patents
Broadband low-noise amplifier circuit and broadband receiver thereof Download PDFInfo
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- CN211046873U CN211046873U CN202020040249.6U CN202020040249U CN211046873U CN 211046873 U CN211046873 U CN 211046873U CN 202020040249 U CN202020040249 U CN 202020040249U CN 211046873 U CN211046873 U CN 211046873U
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- noise amplifier
- broadband
- amplifier circuit
- circuit
- low noise
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Abstract
The utility model discloses a broadband low noise amplifier circuit and broadband receiver thereof belongs to the communication field. The broadband low-noise amplifier circuit comprises a shunt balun circuit, two output ends of the shunt balun circuit are respectively and independently connected with a broadband low-noise amplifier, and output ends of the two broadband low-noise amplifiers are respectively connected with one input end of a combiner balun circuit. The broadband receiver comprises the broadband low-noise amplifier circuit provided by the scheme. The input signal is divided into two signals with phase difference of 180 degrees through the shunt balun circuit, the two signals with phase difference of 180 degrees are combined through the combining balun circuit after being amplified by the broadband low noise amplifier, the phase difference of the two signals after being combined is 0 degree, and the phase difference of the second-order intermodulation signals after being combined is still 180 degrees, so that the second-order intermodulation signals are mutually offset, the suppression of the second-order intermodulation signals is improved, the influence of the second-order intermodulation signals on the performance of a receiver is avoided, and the performance of the receiver is improved.
Description
Technical Field
The utility model relates to the field of communication, concretely relates to broadband low noise amplifier circuit and broadband receiver thereof.
Background
With the development of communication technology, a wideband receiver applied to a multi-system combiner is widely applied to the field of communication, the operating frequency of the wideband receiver generally spans multiple frequency multiplication, in order to ensure the noise coefficient of the receiver, a frequency selection filter of the receiver is generally arranged behind a first-stage wideband low-noise amplifier, the first-stage wideband low-noise amplifier generates a second-order intermodulation signal, the second-order intermodulation signal can generate interference on the reception of signals in a higher frequency band, and particularly when the received signal is stronger, the interference is more obvious (for example, the second-order intermodulation of a GSM 900MHz downlink carrier just falls into a mobile L TE F frequency band (1880-1900 MHz)), so that the performance of the wideband receiver is sharply reduced.
SUMMERY OF THE UTILITY MODEL
The above-mentioned not enough to prior art, the utility model aims at providing a can reduce the second order intermodulation signal of broadband low noise amplifier output and then improve a broadband low noise amplifier circuit of broadband receiver performance and broadband receiver thereof.
In order to achieve the purpose of the invention, the utility model adopts the technical scheme that:
the broadband low-noise amplifier circuit comprises a shunt balun circuit, wherein two output ends of the shunt balun circuit are respectively and independently connected with a broadband low-noise amplifier, and the output ends of the two broadband low-noise amplifiers are respectively connected with one input end of a combiner balun circuit.
The output end of the combined balun circuit is connected with the output lightning protection device through the feeder.
Furthermore, the models of the shunt balun circuit and the combining balun circuit are TCM2-43X +.
Further, the broadband low noise amplifier is model GRF 2105.
Further, the input lightning protection devices are of the type UN1206-150 ASMD.
Further, the limiter is R L M-63-2W +.
Further, the model of the feeder is TCBT-14 +.
Further, the output lightning protection devices are of the type UN1206-150 ASMD.
In another aspect, the present solution further provides a wideband receiver, which includes the wideband low noise amplifier circuit provided by the present solution.
The utility model has the advantages that:
the input signal is divided into two signals with phase difference of 180 degrees through the shunt balun circuit, the two signals with phase difference of 180 degrees are combined through the combining balun circuit after being amplified by the broadband low noise amplifier, the phase difference of the two signals after being combined is 0 degree, and the phase difference of the second-order intermodulation signals after being combined is still 180 degrees, so that the second-order intermodulation signals are mutually offset, the suppression of the second-order intermodulation signals is improved, the influence of the second-order intermodulation signals on the performance of a receiver is avoided, and the performance of the receiver is improved.
Drawings
Fig. 1 is a schematic diagram of a wideband low noise amplifier circuit in an embodiment.
Detailed Description
The following detailed description of the present invention will be made with reference to the accompanying drawings so as to facilitate the understanding of the present invention by those skilled in the art. It should be understood that the embodiments described below are only some embodiments of the invention, and not all embodiments. All other embodiments obtained by a person skilled in the art without any inventive step, without departing from the spirit and scope of the present invention as defined and defined by the appended claims, fall within the scope of protection of the invention.
As shown in fig. 1, the wideband low noise amplifier circuit includes a shunt balun circuit, two output terminals of the shunt balun circuit are separately connected to a wideband low noise amplifier, and output terminals of the two wideband low noise amplifiers are connected to an input terminal of the combiner balun circuit.
When the broadband low-noise amplifier is implemented, the working frequency band of the broadband low-noise amplifier is consistent with the working frequency bands of the shunt balun circuit and the combining balun circuit.
The specific working principle is as follows:
the rf signal input to the shunt balun circuit may be expressed as:
vin＝v0cosω1t+v0cosω2t
wherein, ω is1And ω2For the angular frequency, v, of the incoming radio-frequency signal0Is the amplitude of the incoming radio frequency signal.
The signal entering one of the broadband low noise amplifiers after passing through the shunt balun circuit can be expressed as:
the signal entering the other wideband low noise amplifier can be expressed as:
an input radio frequency signal passes through a broadband low noise amplifier to generate a complex transfer function including a plurality of harmonic components and a combined frequency component, wherein the transfer function is as follows:
vO＝vDC+v1cosω1t+v2cosω2t+v3cos2ω1t+v4cos2ω2t
+v5cos(ω1-ω2)t+v6cos(ω1+ω2)t+…
wherein v isDcTo output a DC voltage, v1～v6To output the level of the frequency component, v1cosω1t+v2cosω2t is the amplified RF signal, v5cos(ω1-ω2) t and v6cos(ω1+ω2) t is the second-order intermodulation signal. In the case of considering only the rf signal and the second order intermodulation signal:
wherein, the transfer function of one of the broadband low noise amplifiers is:
vout1＝v1cosω1t+v2cosω2t+v5cos(ω1-ω2)t+v6cos(ω1+ω2)t+…
the transfer function of the other broadband low noise amplifier is as follows:
vout2＝v1cos(ω1+π)t+v2cos(ω2+π)t+v5cos[(ω1+π)-(ω2+π)]t
+v6cos[(ω1+π)+(ω2+π)]t+…
＝-v1cosω1t-v2cosω2t+v5cos(ω1-ω2)t+v6cos(ω1+ω2)t+…
after passing through the combined balun circuit, the transfer function of the output signal becomes:
vout＝[v1cosω1t+v2cosω2t+v5cos(ω1-ω2)t+v6cos(ω1+ω2)t+…]
+[-v1cos(ω1+π)t-v2cos(ω2+π)t+v5cos(ω1-ω2+π)t
+v6cos(ω1+ω2+π)t+…]
＝2v1cosω1t+2v2cosω2t+…
according to the formula, after passing through the shunt balun circuit, the broadband low-noise amplifier and the combining balun circuit in sequence, all the second-order intermodulation signals are cancelled.
In another embodiment, as shown in fig. 1, the wideband low noise amplifier circuit further includes an input lightning protection device, an output terminal of the input lightning protection device is connected to an output terminal of the shunt balun circuit through an amplitude limiter, and an output terminal of the combiner balun circuit is connected to the output lightning protection device through a feeder.
The input lightning protection device can effectively prevent the circuit device damage caused by the lightning stroke of the antenna, and the output lightning protection device can effectively prevent the circuit device damage caused by the lightning stroke of the power supply line. The amplitude limiter can effectively prevent the circuit devices from being damaged when the antenna receives a high-power signal and inputs the high-power signal into the broadband low-noise amplifier circuit when a base station nearby the antenna transmits the high-power signal. The feeder is used for separating direct current power supply provided by the radio frequency signal output end from the radio frequency signal and is used for direct current power supply of the whole broadband low-noise amplifier circuit.
Specifically, the shunt balun circuit and the combining balun circuit are TCM2-43X +, the broadband low noise amplifier is GRF2105, the input lightning protection device is UN1206-150ASMD, the amplitude limiter is R L M-63-2W +, the feeder is TCBT-14+, and the output lightning protection device is UN1206-150 ASMD.
In another aspect, the present solution further provides a wideband receiver, which includes the wideband low noise amplifier circuit provided by the present solution.
Claims (9)
1. The broadband low-noise amplifier circuit is characterized by comprising a shunt balun circuit, wherein two output ends of the shunt balun circuit are respectively and independently connected with a broadband low-noise amplifier, and the output ends of the two broadband low-noise amplifiers are respectively connected with one input end of a combiner balun circuit.
2. The wideband low noise amplifier circuit according to claim 1, further comprising an input lightning arrester, wherein an output terminal of the input lightning arrester is connected to an output terminal of the shunt balun circuit through a limiter, and an output terminal of the combiner balun circuit is connected to the output lightning arrester through a feeder.
3. The wideband low noise amplifier circuit according to claim 1, wherein the split balun circuit and the combined balun circuit are model number TCM2-43X +.
4. The wideband low noise amplifier circuit of claim 1, wherein the wideband low noise amplifier model is GRF 2105.
5. The wideband low noise amplifier circuit according to claim 2, wherein the input lightning protector is of type UN1206-150 ASMD.
6. The wideband low noise amplifier circuit of claim 2, wherein the limiter is of the type R L M-63-2W +.
7. A wideband low noise amplifier circuit according to claim 2, characterized in that the feeder is of the type TCBT-14 +.
8. A wideband low noise amplifier circuit according to claim 2, 5, 6 or 7, characterised in that the output lightning protector is of type UN1206-150 ASMD.
9. A wideband receiver comprising the wideband low noise amplifier circuit of any of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020040249.6U CN211046873U (en) | 2020-01-09 | 2020-01-09 | Broadband low-noise amplifier circuit and broadband receiver thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020040249.6U CN211046873U (en) | 2020-01-09 | 2020-01-09 | Broadband low-noise amplifier circuit and broadband receiver thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211046873U true CN211046873U (en) | 2020-07-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020040249.6U Active CN211046873U (en) | 2020-01-09 | 2020-01-09 | Broadband low-noise amplifier circuit and broadband receiver thereof |
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| Country | Link |
|---|---|
| CN (1) | CN211046873U (en) |
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2020
- 2020-01-09 CN CN202020040249.6U patent/CN211046873U/en active Active
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