CN112737617A - Amplifier for vehicle-mounted radio frequency receiver and receiver - Google Patents
Amplifier for vehicle-mounted radio frequency receiver and receiver Download PDFInfo
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Abstract
The invention provides an amplifier for a vehicle-mounted radio frequency receiver and a receiver, wherein the amplifier comprises a first-stage low-noise amplifier, a second-stage low-gain amplifier and a third-stage low-noise amplifier; the input end of the first-stage low-noise amplifier receives the antenna signal after filtering, the output end of the first-stage low-noise amplifier is connected with the input end of the second-stage low-gain amplifier, and the antenna signal comprises a CDMA signal; the output end of the second-stage low-gain amplifier is connected with the input end of the third-stage low-noise amplifier; the output end of the third-stage low noise amplifier is used for being connected with the input end of a subsequent signal processing device; the signal amplifier solves the problems that the signal gain of the existing signal amplifier for amplifying the communication signals such as CDMA signals received by the European ring line vehicle-mounted equipment is not obvious, the noise coefficient is large, and the amplification processing of the communication signals such as CDMA signals received by the European ring line vehicle-mounted equipment cannot be met.
Description
Technical Field
The invention belongs to the technical field of vehicle-ground communication, and particularly relates to an amplifier for a vehicle-mounted radio frequency receiver and the receiver.
Background
The european loop wire generally transmits a CDMA signal by using a ground trackside leaky cable, and the vehicle-mounted device receives and demodulates the CDMA signal transmitted by the ground trackside leaky cable, thereby implementing vehicle-ground communication.
The communication signal bottom limit specified in the european loop protocol is very small, for example, the CDMA signal bottom limit received by the vehicle-mounted device is very small and far smaller than the environmental interference noise, and if the communication signals such as the CDMA signal are not amplified, the accuracy of the subsequent digital signal processing circuit in processing the communication signals such as the CDMA signal is affected, so that the message information to be transmitted cannot be accurately demodulated by the subsequent digital signal processing circuit.
The existing signal amplifier is generally used for amplifying transmission signals and then sending the transmission signals to a subsequent digital signal processing circuit for processing, but the existing signal amplifier has an unobvious signal gain for amplifying communication signals such as CDMA signals received by European ring line vehicle-mounted equipment, and has a large noise coefficient, so that the requirement of the European ring line vehicle-mounted equipment for amplifying the received communication signals such as the CDMA signals cannot be met.
Disclosure of Invention
In order to overcome the existing defects, the invention provides an amplifier and a receiver for a vehicle-mounted radio frequency receiver, which solve the problem that the existing signal amplifier cannot meet the amplification processing of communication signals such as CDMA signals received by European ring line vehicle-mounted equipment because the signal gain of the communication signals such as CDMA signals received by the European ring line vehicle-mounted equipment is not obvious and the noise coefficient is large.
The invention is realized by the following technical scheme:
the invention provides an amplifier for a vehicle-mounted radio frequency receiver, which comprises a first-stage low-noise amplifier, a second-stage low-gain amplifier and a third-stage low-noise amplifier;
the input end of the first-stage low-noise amplifier receives the antenna signal after filtering, the output end of the first-stage low-noise amplifier is connected with the input end of the second-stage low-gain amplifier, and the antenna signal comprises a CDMA signal;
the output end of the second-stage low-gain amplifier is connected with the input end of the third-stage low-noise amplifier;
and the output end of the third-stage low noise amplifier is used for being connected with the input end of a subsequent signal processing device.
Further, the first-stage low noise amplifier comprises a first low noise amplifier and a second low noise amplifier;
the second stage low gain amplifier comprises a first low gain amplifier and a second low gain amplifier;
the third stage low noise amplifier includes a third low noise amplifier and a fourth low noise amplifier.
Further, an input end of the first low noise amplifier receives the antenna signal after filtering, an output end of the first low noise amplifier is connected with an input end of the first low gain amplifier, an output end of the first low gain amplifier is connected with an input end of the third low noise amplifier, and an output end of the third low noise amplifier is used for being connected with a first subsequent signal processing device;
the input end of the second low-noise amplifier receives the antenna signal after filtering processing, the output end of the second low-noise amplifier is connected with the input end of the second low-gain amplifier, the output end of the second low-noise amplifier is connected with the input end of the fourth low-noise amplifier, and the output end of the fourth low-noise amplifier is used for being connected with a second subsequent signal processing device.
Further, the first stage low noise amplifier or the third stage low noise amplifier includes:
the broadband amplifier comprises a third input end, an input matching unit, a broadband amplifier, a first power supply unit and a third output end;
the broadband amplifier comprises a radio frequency input end, a radio frequency output end, a power supply input end and a grounding end;
the third input end is connected with the input end of the input matching unit, and the output end of the input matching unit is connected with the radio frequency input end of the broadband amplifier;
the radio frequency output end of the broadband amplifier is connected with the third output end, and the grounding end of the broadband amplifier is grounded;
the output end of the first power supply unit is connected with the power supply input end of the broadband amplifier.
Further, the first-stage low noise amplifier or the third-stage low noise amplifier further comprises a first-stage coupling unit, and the first-stage coupling unit comprises a first coupling unit and a second coupling unit;
the input end of the first coupling unit is connected with the output end of the input matching unit, and the output end of the first coupling unit is connected with the radio frequency input end of the broadband amplifier;
the input end of the second coupling unit is connected with the radio frequency output end of the broadband amplifier, and the output end of the second coupling unit is connected with the third output end.
Further, the first-stage low noise amplifier or the third-stage low noise amplifier further comprises a joint stabilizing unit;
one end of the combined stabilizing unit is connected with the output end of the first coupling unit and the radio frequency input end of the broadband amplifier;
and the other end of the combined stabilizing unit is connected with the radio frequency output end of the broadband amplifier and the input end of the second coupling unit.
Further, the second-stage low-gain amplifier comprises a fourth input end, a broadband microwave amplifier, a second power supply unit and a fourth output end;
the broadband microwave amplifier comprises a radio frequency input end, a radio frequency output end, a power supply input end and a grounding end;
the fourth input end is connected with the radio frequency input end of the broadband microwave amplifier, and the radio frequency output end of the broadband microwave amplifier is connected with the fourth output end;
the power supply input end of the broadband microwave amplifier is connected with the output end of the second power supply unit;
and the grounding end of the broadband microwave amplifier is grounded.
Further, the second-stage low-gain amplifier further comprises a second-stage coupling unit, and the second-stage coupling unit comprises a third coupling unit and a fourth coupling unit;
the input end of the third coupling unit is connected with the fourth input end, and the output end of the third coupling unit is connected with the radio frequency input end of the broadband microwave amplifier;
the input end of the fourth coupling unit is connected with the radio frequency output end of the broadband microwave amplifier, and the output end of the fourth coupling unit is connected with the fourth output end.
The present invention also provides a vehicle radio frequency receiver,
comprises the amplifier;
the high-power band-pass filter and the low-pass filter are also included;
the input end of the high-power band-pass filter receives an antenna signal, the output end of the high-power band-pass filter is connected with the input end of the low-pass filter, and the output end of the low-pass filter is connected with the input end of the first-stage low-noise amplifier.
Further, the first-stage low noise amplifier comprises a first low noise amplifier and a second low noise amplifier;
the second stage low gain amplifier comprises a first low gain amplifier and a second low gain amplifier;
the third stage low noise amplifier includes a third low noise amplifier and a fourth low noise amplifier.
Further, an input end of the first low noise amplifier is connected with an output end of the low pass filter, an output end of the first low noise amplifier is connected with an input end of the first low gain amplifier, an output end of the first low gain amplifier is connected with an input end of the third low noise amplifier, and an output end of the third low noise amplifier is used for being connected with a first subsequent signal processing device;
the input end of the second low-noise amplifier is connected with the output end of the low-pass filter, the output end of the second low-noise amplifier is connected with the input end of the second low-gain amplifier, the output end of the second low-noise amplifier is connected with the input end of the fourth low-noise amplifier, and the output end of the fourth low-noise amplifier is used for being connected with a second subsequent signal processing device.
Compared with the closest prior art, the technical scheme of the invention has the following beneficial effects:
the invention provides an amplifier for a vehicle-mounted radio frequency receiver, which comprises a first-stage low noise amplifier, a second-stage low gain amplifier and a third-stage low noise amplifier which are connected in sequence, wherein the input end of the first-stage low noise amplifier receives antenna signals after filtering, the output end of the third-stage low noise amplifier is used for being connected with the input end of a subsequent signal processing device, the amplifier adopts a three-stage amplification structure and amplifies the antenna signals which are subjected to filtering and contain communication signals such as CDMA signals, so that the signal gain is improved by about 60dB, the noise coefficient is very low, and the noise coefficient in a working frequency band is only about 1dB, thereby meeting the requirement of the amplification processing of the communication signals such as CDMA signals received by European loop vehicle-mounted equipment, and further ensuring the accuracy of the subsequent signal processing device in processing the communication signals such as the CDMA signals, the subsequent digital signal processing circuit can accurately demodulate the message information to be transmitted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a block diagram of the structural connections of a vehicle RF receiver;
FIG. 2 is a circuit configuration diagram of a high power bandpass filter;
FIG. 3 is a circuit configuration diagram of the first or second low power band pass filter;
fig. 4 is a circuit configuration diagram of a first low noise amplifier, a second low noise amplifier, a third low noise amplifier, or a fourth low noise amplifier;
FIG. 5 is a circuit configuration diagram of the first low gain amplifier or the second low gain amplifier;
FIG. 6 is a block diagram of a power splitter;
fig. 7 is a circuit configuration diagram of the first or second differential conversion circuit;
FIG. 8 is a schematic diagram of a simulation model of a high power bandpass filter;
FIG. 9 is a diagram showing simulation results of a high power bandpass filter;
FIG. 10 is a schematic diagram showing a port standing wave simulation result of the high-power band-pass filter;
FIG. 11 is a schematic diagram of a simulation model of the first or second low power band pass filter;
FIG. 12 is a diagram illustrating simulation results of the first or second low power band pass filter;
FIG. 13 is a schematic diagram showing the port standing wave simulation results of the first or second low power band pass filters;
FIG. 14 is a frequency response graph of a low pass filter;
FIG. 15 is a diagram showing simulation results of a low-pass filter;
fig. 16 is a diagram illustrating simulation results of balun.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The term "connected" as used herein includes a direct connection between two components and an indirect connection between two components through other components or circuits.
In the present embodiment, a CDMA communication signal is taken as an example for explanation, as shown in fig. 1, a connection block diagram of a structure of the vehicle-mounted radio frequency receiver for CDMA communication in the present embodiment is shown, and a vehicle-mounted radio frequency receiving board for CDMA communication in the present embodiment can be seen from the diagram, and includes a high-power band pass filter, a low-pass filter, a power splitter, a first-stage low noise amplifier, a low-power band pass filter, a second-stage low gain amplifier, a third-stage low noise amplifier, and a differential conversion circuit;
the first-stage low-noise amplifier comprises a first low-noise amplifier and a second low-noise amplifier which have the same structure;
the second-stage low-gain amplifier comprises a first low-gain amplifier and a second low-gain amplifier which have the same structure;
the third-stage low-noise amplifier comprises a third low-noise amplifier and a fourth low-noise amplifier which have the same structure;
the low-power band-pass filter comprises a first low-power band-pass filter and a second low-power band-pass filter which have the same structure;
the differential conversion circuit includes a first differential conversion circuit and a second differential conversion circuit having the same structure.
The input end of the high-power band-pass filter receives antenna signals, the antenna signals comprise CDMA signals, 27.095MHz transponder activation signals and 4.5MHz transponder signals, and the output end of the high-power band-pass filter is connected with the input end of the low-pass filter;
as shown in fig. 6, an input PORT of the power splitter is connected to an output of the low pass filter, the power splitter has two output PORTS PORT1 and PORT2, a first output PORT1 of the power splitter is connected to an input of the first low noise amplifier, an output of the first low noise amplifier is connected to an input of the first low gain amplifier, an output of the first low gain amplifier is connected to an input of the third low noise amplifier, an output of the third low noise amplifier is connected to an input of the first differential conversion circuit, and an output of the first differential conversion circuit is used for being connected to an input of the analog-to-digital converter;
the second output PORT2 of the power splitter is connected to the input terminal of the second low noise amplifier, the output terminal of the second low noise amplifier is connected to the input terminal of the second low gain amplifier, the output terminal of the second low gain amplifier is connected to the input terminal of the fourth low noise amplifier, the output terminal of the fourth low noise amplifier is connected to the input terminal of the second differential conversion circuit, and the output terminal of the second differential conversion circuit is used for being connected to the input terminal of the analog-to-digital converter.
The signal from the antenna contains not only a small CDMA signal at 13.5MHz but also an active signal at 27.095MHz, which is large in amplitude and has a power of 20W, and if the signal at 27.095MHz is not suppressed, the amplifier cannot withstand the processing directly by entering the antenna signal into the amplifier, thereby causing the amplifier to be damaged. Meanwhile, the suppression of the signal from the transponder at 4.5MHz is also considered, and the subsequent amplifier can effectively amplify the signal in the working band, so that the antenna signal of the embodiment firstly enters a high-power band-pass filter for filtering.
The bandwidth of the high-power band-pass filter is 11.05MHz-16.05 MHz;
and (3) internal insertion loss: the signal pass band (11.05 MHz-16.05 MHz) and the in-band insertion loss is less than or equal to 5 dB;
out-of-band suppression:
for 27.095MHz, as much as possible inhibition is required, and the out-of-band inhibition is required to be more than or equal to 50 dB;
for 6MHz, the out-of-band rejection is more than or equal to 40 dB.
As shown in fig. 2, the high-power band-pass filter includes a first input terminal, a first series resonant unit, a first parallel resonant unit, a second series resonant unit, a second parallel resonant unit, a third series resonant unit, a third parallel resonant unit, a fourth series resonant unit, a fourth parallel resonant unit, and a first output terminal;
the first input end, the first series resonance unit, the first parallel resonance unit, the second series resonance unit, the second parallel resonance unit, the third series resonance unit, the third parallel resonance unit, the fourth series resonance unit, the fourth parallel resonance unit and the first output end are connected in sequence;
in the figure, a first input terminal is provided on the side of J101, a signal input connector is provided on the side of J101, MCX is used as the connector, an antenna signal is input from J101, and a first output terminal is provided on the side of 102.
The first series resonant unit includes an inductance L101 (500 nH) and a capacitance C101 (470 pF), the inductance L101 and the capacitance C101 are connected in series, the first parallel resonant unit includes an inductance L102 (390 nH) and a capacitance C102 (390 pF), the inductance L102 and the capacitance C102 are connected in parallel and grounded, the second series resonant unit includes an inductance L103 (500 nH), an inductance L104 (500 nH), an inductance L105 (500 nH), and a capacitance C103 (100 pF), the inductance L103, the inductance L104, the inductance L105, and the capacitance C103 are connected in series in this order, the second parallel resonant unit includes an inductance L106 (220 nH) and a capacitance C104 (680 pF), the inductance L106 and the capacitance C104 are connected in parallel and grounded, the third series resonant unit includes an inductance L107 (1.8 uH) and a capacitance C105 (91 pF), the inductance L107 and the capacitance C105 are connected in series, the third parallel resonant unit includes an inductance L108 (270 nH) and a capacitance C106 (560 pF), and the inductance L106 and the capacitance C106 (91 pF) are connected in parallel and grounded, the fourth series resonant unit comprises an inductor L109 (1.0 uH) and a capacitor C107 (160 pF), the inductor L109 and the capacitor C107 are connected in series, the fourth parallel resonant unit comprises an inductor L110 (1.2 uH) and a capacitor C108 (130 pF), and the inductor L110 and the capacitor C108 are connected in parallel and are grounded.
Fig. 8 is a schematic diagram of a simulation model of the high-power band-pass filter of the present embodiment, in which a maximum flat (butterworth) structure is adopted to ensure flatness of amplitude-frequency characteristics in a pass band;
FIG. 9 is a diagram showing simulation results of the high power bandpass filter of the present invention, in which the abscissa represents frequency in MHz and the ordinate represents insertion loss or signal rejection in dB; fig. 10 is a schematic diagram showing simulation results of port standing waves of the high-power band-pass filter of the present invention, in which the abscissa represents frequency and the ordinate represents port standing waves in dB, and fig. 9 can be seen in conjunction with fig. 10: in the passband, the insertion loss is maximum from 11.05MHz to 16.05 MHz: -3.721dB, suppression at 27.09 MHz-62.012 dB, suppression at 6 MHz-52.547 dB, and-11.598 dB at worst port standing wave.
Preferably, in order to increase the suppression of signals below 6MHz and 27.095MHz, a first low-power band-pass filter is provided between the output of the first low-noise amplifier and the input of the first low-gain amplifier, a second low-power band-pass filter is provided between the output of the second low-noise amplifier and the input of the second low-gain amplifier, specifically, the input of the first low-power band-pass filter is connected to the output of the first low-noise amplifier, the output of the first low-power band-pass filter is connected to the input of the first low-gain amplifier, the input of the second low-power band-pass filter is connected to the output of the second low-noise amplifier, and the output of the second low-power band-pass filter is connected to the input of the second low-noise amplifier.
The first low-power band-pass filter or the second low-power band-pass filter meets the following requirements:
and (3) internal insertion loss: the signal pass band (11.05 MHz-16.05 MHz) and the in-band insertion loss is less than or equal to 4 dB;
out-of-band suppression:
for 27.095MHz, as much as possible inhibition is required, and the out-of-band inhibition is required to be more than or equal to 25 dB;
for 6MHz, the out-of-band rejection is more than or equal to 25 dB.
As shown in fig. 3, the first low-power band-pass filter or the second low-power band-pass filter includes a second input terminal, a fifth series resonant unit, a fifth parallel resonant unit, a sixth series resonant unit, a sixth parallel resonant unit, and a second output terminal;
the second input end, the fifth series resonance unit, the fifth parallel resonance unit, the sixth series resonance unit, the sixth parallel resonance unit and the second output end are connected in sequence;
specifically, in the drawing, 11 denotes a second input terminal, 12 denotes a second output terminal, the fifth series resonant unit includes a capacitor C1 (430 pF) and an inductor L1 (560 nH), the capacitor C1 and the inductor L1 are connected in series, the fifth parallel resonant unit includes a capacitor C2 (470 pF) and an inductor L2 (330 nH), the capacitor C2 and the inductor L2 are connected in parallel and grounded, the sixth series resonant unit includes a capacitor C3 (100 pF) and an inductor L3 (1.5 uH), the capacitor C3 and the inductor L3 are connected in series, the sixth parallel resonant unit includes a capacitor C5 (330 pF), a capacitor C4 (270 pF) and an inductor L4 (220 nH), and the capacitor C5, the capacitor C4 and the inductor L4 are connected in parallel and grounded.
Fig. 11 is a schematic diagram of a simulation model of the first or second low-power band-pass filter of this embodiment, which adopts a maximum flat (butterworth) structure to ensure the flatness of the amplitude-frequency characteristic in the pass band;
FIG. 12 is a graph showing simulation results for the first or second low power bandpass filters of the present invention, where the abscissa represents frequency in MHz and the ordinate represents insertion loss or signal rejection in dB; fig. 13 is a schematic diagram showing simulation results of port standing waves of the first or second low-power band-pass filter of the present invention, wherein the abscissa represents frequency and the ordinate represents port standing waves in dB, and fig. 12 can be seen in combination with fig. 13: in the passband, the insertion loss is maximum from 11.05MHz to 16.05 MHz: -3.639dB, suppression at 27.09 MHz-31.135 dB, suppression at 6 MHz-30.91 dB, and-12.544 dB at worst port standing wave.
The low-pass filter of the present invention is placed behind the high-power band-pass filter for increasing and suppressing 27.095MHz signals, fig. 14 is a frequency response curve diagram of the low-pass filter of the present invention, the abscissa represents frequency, the unit MHz, the ordinate represents insertion loss, the unit dB, DC represents 0MHz, and F1 to F6 represent different frequency points, specifically, see frequency values corresponding to F1 to F6 in table 1. FIG. 15 is a graph of simulation results for a low pass filter of the present invention, where the abscissa represents frequency in MHz and the ordinate represents insertion loss or signal rejection in dB; as can be seen, the rejection at 27.09MHz can reach 50dB, the in-band insertion loss is small, and the rejection at 16.05MHz is-0.419 dB.
The following tables 1 and 2 show the related technical indexes of the low-pass filter of the embodiment at 25 ℃.
TABLE 1
TABLE 2
The power splitter divides the received radio frequency signal of the low-pass filter into two paths, wherein the first path is used as a main system circuit, the second path is used as a standby system circuit, and when the first path fails, the second path can be used as a standby circuit, so that signal transmission and processing are not influenced;
the first circuit comprises the first low-noise amplifier, a first low-power band-pass filter, a first low-gain amplifier, a third low-noise amplifier and a first differential conversion circuit;
the second circuit comprises the second low-noise amplifier, the second low-power band-pass filter, the second low-gain amplifier, the fourth low-noise amplifier and the second differential conversion circuit.
The power splitter of the embodiment adopts APD-2-1+ of Mini-Cricuits company, the working frequency of the device is 0.5-400MHz, and the power splitter has low insertion loss and excellent amplitude/phase imbalance performance.
Tables 3 and 4 below show the related technical indexes of the power splitter of the present embodiment.
Table 3:
table 4:
the amplifier is located at the front end of the receiver chain, and after the antenna filter, the purpose of the amplifier is to amplify the very weak signal captured by the antenna, to increase the signal-to-noise ratio of the signal, for the convenience of subsequent circuit signal processing. In order to maximize the sensitivity of the receiver, the noise level of the amplifier should be as low as possible, and the following table 5 shows the system index analysis of the receiver.
Table 5:
according to the above analysis of the system index of the receiver, as described above, the amplifier of this embodiment adopts a three-stage amplification structure, that is, the amplifier of this embodiment includes the first-stage low noise amplifier, the second-stage low gain amplifier, and the third-stage low noise amplifier, and the first-stage low noise amplifier and the third-stage low noise amplifier adopt the same structure, and the second-stage low gain amplifier adopts a structure different from the first-stage low noise amplifier and the third-stage low noise amplifier.
Specifically, the first low-noise amplifier, the second low-noise amplifier, the third low-noise amplifier and the fourth low-noise amplifier adopt the same structure, and the first low-gain amplifier and the second low-gain amplifier adopt structures different from the structures of the first low-noise amplifier, the second low-noise amplifier, the third low-noise amplifier and the fourth low-noise amplifier.
As shown in fig. 4, the first, second, third, or fourth low noise amplifier includes:
the broadband amplifier adopts PHA-13LN +, and the first-stage coupling unit comprises a first coupling unit and a second coupling unit;
the broadband amplifier comprises a radio frequency input end, a radio frequency output end, a power supply input end and a grounding end;
the third input end is connected with the input end of the input matching unit, the output end of the input matching unit is connected with the input end of the first coupling unit, the output end of the first coupling unit is connected with the radio-frequency input end of the broadband amplifier, the radio-frequency output end of the broadband amplifier is connected with the input end of the second coupling unit, and the output end of the second coupling unit is connected with the third output end;
the grounding end of the broadband amplifier is grounded;
the output end of the first power supply unit is connected with the power supply input end of the broadband amplifier;
one end of the combined stabilizing unit is connected with the output end of the first coupling unit and the radio frequency input end of the broadband amplifier;
the other end of the combined stabilizing unit is connected with the radio frequency output end of the broadband amplifier and the input end of the second coupling unit.
Specifically, 13 in the figure represents a third input terminal, 14 represents a third output terminal, the input matching unit includes a capacitor C406 (1.5 pF), an inductor L401 (5.1 nH), and the first coupling unit is a capacitor C401 (2.2 uF);
the input end of the capacitor C406 is connected with the third input end, the output end of the capacitor C406 is grounded, the input end of the inductor L401 is connected with the third input end, and the output end of the inductor L401 is connected with the input end of the capacitor C401;
the PHA-13LN + is provided with a first pin 1, a second pin 2, a third pin 3 and a fourth pin 4, wherein the first pin 1 is a radio frequency input end, the third pin 3 is a radio frequency output end, the second pin 2 and the fourth pin 4 are grounding ends, and the radio frequency output end is also a power supply input end;
the second coupling unit is a capacitor C402 (2.2 uF);
the combined stabilizing unit comprises a capacitor C403 (0.1 uF) and a resistor R401 (1500R), wherein the capacitor C403 and the resistor R401 are connected in series, the capacitor C403 is connected with the capacitor C401 and the first pin 1, and the resistor R401 is connected with the third pin 3 and the capacitor C402;
the first power supply unit comprises a capacitor C405 (1000 pF), a capacitor C404 (10 uF) and an inductor L402 (15 uH), wherein the capacitor C405 and the capacitor C404 are arranged in parallel, one end of the capacitor C405 is grounded, the other end of the capacitor C405 is connected with the inductor L402, one end of the capacitor C404 is grounded, the other end of the capacitor C404 is connected with the inductor L402, and the inductor L402 is connected with the radio-frequency output end.
The performance indexes of the PHA-13LN + are shown in the following table 6:
table 6:
as shown in fig. 5, the first low-gain amplifier or the second low-gain amplifier includes a fourth input terminal, a broadband microwave amplifier, a second-stage coupling unit, a second power supply unit, and a fourth output terminal; the broadband microwave amplifier adopts GALI-6+, and the second-stage coupling unit comprises a third coupling unit and a fourth coupling unit;
the broadband microwave amplifier comprises a radio frequency input end, a radio frequency output end, a power supply input end and a grounding end;
the fourth input end is connected with the input end of the third coupling unit, the output end of the third coupling unit is connected with the radio frequency input end of the broadband microwave amplifier, the radio frequency output end of the broadband microwave amplifier is connected with the input end of the fourth coupling unit, and the output end of the fourth coupling unit is connected with the fourth output end;
the power supply input end of the broadband microwave amplifier is connected with the output end of the second power supply unit;
the grounding end of the broadband microwave amplifier is grounded.
Specifically, 15 in the figure indicates a fourth input terminal, 16 indicates a fourth output terminal;
the third coupling unit adopts a capacitor C503 (2.2 uF), and the fourth coupling unit adopts a capacitor C504 (2.2 uF);
GALI-6+ has a fifth pin 1, a sixth pin 3, a seventh pin 4 and an eighth pin 2, wherein the fifth pin 1 is a radio frequency input terminal, the sixth pin 3 is a radio frequency output terminal, the seventh pin 4 and the eighth pin 2 are grounding terminals, and the radio frequency output terminal is also a power supply input terminal;
the second power supply unit comprises a capacitor C501 (1000 pF), a capacitor C502 (10 uF) and an inductor L502 (15 uH), wherein the capacitor C501 and the capacitor C502 are arranged in parallel, one end of the capacitor C501 is grounded, the other end of the capacitor C501 is connected with the inductor L502, one end of the capacitor C502 is grounded, the other end of the capacitor C502 is connected with the inductor L502, and the inductor L502 is connected with a sixth pin 3.
The GALI-6+ performance index is shown in the following Table 7:
table 7:
the first differential conversion circuit or the second differential conversion circuit includes: the fifth input end, the balun, the third-stage coupling unit, the fourth-stage coupling unit and the port standing wave matching unit;
the balun comprises an input end, a first output end, a second output end and a grounding end;
the third-stage coupling unit comprises a fifth coupling unit, and the fourth-stage coupling unit comprises a sixth coupling unit and a seventh coupling unit;
the fifth input end is connected with the input end of the fifth coupling unit, the output end of the fifth coupling unit is connected with the input end of the balun, and the grounding end of the balun is grounded;
the first output end of the balun is connected with the input end of the sixth coupling unit, and the output end of the sixth coupling unit is connected with the input end of the port standing wave matching unit;
the second output end of the balun is connected with the input end of the seventh coupling unit, and the output end of the seventh coupling unit is connected with the input end of the port standing wave matching unit;
the output end of the port standing wave matching unit is used for being connected with an analog-to-digital converter;
further, the port standing wave matching unit comprises a first resistor (R907, 33R), a second resistor (R908, 33R) and a first capacitor (C954, 1 pF);
the input end of the first resistor is connected with the output end of the sixth coupling unit, the first output end of the first resistor is connected with one end of the first capacitor, and the second output end of the first resistor is used for outputting a differential signal RF + to the analog-to-digital converter;
the input end of the second resistor is connected with the output end of the seventh coupling unit, the first output end of the second resistor is connected with the other end of the first capacitor, and the second output end of the second resistor is used for outputting a differential signal RF-to the analog-to-digital converter.
Specifically, as shown in fig. 7, 17 denotes a fifth input terminal, the fifth coupling unit adopts a capacitor C951 (1 uF), the sixth coupling unit is a capacitor C952 (1 uF), the seventh coupling unit is a capacitor C953 (1 uF), the balun adopts ADT4-1 of Mini-Circuits, ADT4-1 has a ninth pin 1, a tenth pin 2, an eleventh pin 3, a twelfth pin 4, a thirteenth pin 5, and a fourteenth pin 6, wherein the ninth pin 1 is an input terminal of the balun, the twelfth pin 4 is a second output terminal of the balun, the fourteenth pin 6 is a first output terminal of the balun, the tenth pin 2, the eleventh pin 3, and the thirteenth pin 5 are grounded, and the tenth pin 2 is grounded through a capacitor C939 (0.1 uF), and the thirteenth pin 5 is grounded through a capacitor C938 (0.1 uF).
Specifically, the balun realizes the conversion from a single end to a differential signal, and fig. 16 is a schematic diagram of a simulation result of the balun according to the present invention, where an abscissa represents frequency in MHz, and an ordinate represents insertion loss or signal rejection in dB; as can be seen from the figure, the in-band insertion loss at 13.50MHz is small, being-1.440 dB.
The performance metrics of balun are shown in tables 8 and 9 below;
table 8:
table 9:
although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.
Claims (11)
1. An amplifier for a vehicle radio frequency receiver, the amplifier comprising a first stage low noise amplifier, a second stage low gain amplifier and a third stage low noise amplifier;
the input end of the first-stage low-noise amplifier receives the antenna signal after filtering, the output end of the first-stage low-noise amplifier is connected with the input end of the second-stage low-gain amplifier, and the antenna signal comprises a CDMA signal;
the output end of the second-stage low-gain amplifier is connected with the input end of the third-stage low-noise amplifier;
and the output end of the third-stage low noise amplifier is used for being connected with the input end of a subsequent signal processing device.
2. The amplifier of claim 1, wherein the first stage low noise amplifier comprises a first low noise amplifier and a second low noise amplifier;
the second stage low gain amplifier comprises a first low gain amplifier and a second low gain amplifier;
the third stage low noise amplifier includes a third low noise amplifier and a fourth low noise amplifier.
3. An amplifier for a vehicle radio frequency receiver according to claim 2,
the input end of the first low-noise amplifier receives the antenna signal after filtering, the output end of the first low-noise amplifier is connected with the input end of the first low-gain amplifier, the output end of the first low-noise amplifier is connected with the input end of the third low-noise amplifier, and the output end of the third low-noise amplifier is used for being connected with a first subsequent signal processing device;
the input end of the second low-noise amplifier receives the antenna signal after filtering processing, the output end of the second low-noise amplifier is connected with the input end of the second low-gain amplifier, the output end of the second low-noise amplifier is connected with the input end of the fourth low-noise amplifier, and the output end of the fourth low-noise amplifier is used for being connected with a second subsequent signal processing device.
4. An amplifier for a vehicle radio frequency receiver according to claim 2,
the first stage low noise amplifier or the third stage low noise amplifier includes:
the broadband amplifier comprises a third input end, an input matching unit, a broadband amplifier, a first power supply unit and a third output end;
the broadband amplifier comprises a radio frequency input end, a radio frequency output end, a power supply input end and a grounding end;
the third input end is connected with the input end of the input matching unit, and the output end of the input matching unit is connected with the radio frequency input end of the broadband amplifier;
the radio frequency output end of the broadband amplifier is connected with the third output end, and the grounding end of the broadband amplifier is grounded;
the output end of the first power supply unit is connected with the power supply input end of the broadband amplifier.
5. Amplifier for a vehicle radio frequency receiver according to claim 4,
the first-stage low noise amplifier or the third-stage low noise amplifier further comprises a first-stage coupling unit, and the first-stage coupling unit comprises a first coupling unit and a second coupling unit;
the input end of the first coupling unit is connected with the output end of the input matching unit, and the output end of the first coupling unit is connected with the radio frequency input end of the broadband amplifier;
the input end of the second coupling unit is connected with the radio frequency output end of the broadband amplifier, and the output end of the second coupling unit is connected with the third output end.
6. The amplifier for the vehicle-mounted radio frequency receiver according to claim 5, wherein the first stage low noise amplifier or the third stage low noise amplifier further comprises a joint stabilization unit;
one end of the combined stabilizing unit is connected with the output end of the first coupling unit and the radio frequency input end of the broadband amplifier;
and the other end of the combined stabilizing unit is connected with the radio frequency output end of the broadband amplifier and the input end of the second coupling unit.
7. The amplifier for the vehicle-mounted radio frequency receiver according to claim 4, wherein the second-stage low-gain amplifier comprises a fourth input end, a broadband microwave amplifier, a second power supply unit and a fourth output end;
the broadband microwave amplifier comprises a radio frequency input end, a radio frequency output end, a power supply input end and a grounding end;
the fourth input end is connected with the radio frequency input end of the broadband microwave amplifier, and the radio frequency output end of the broadband microwave amplifier is connected with the fourth output end;
the power supply input end of the broadband microwave amplifier is connected with the output end of the second power supply unit;
and the grounding end of the broadband microwave amplifier is grounded.
8. An amplifier for a vehicle radio frequency receiver according to claim 7,
the second-stage low-gain amplifier further comprises a second-stage coupling unit, and the second-stage coupling unit comprises a third coupling unit and a fourth coupling unit;
the input end of the third coupling unit is connected with the fourth input end, and the output end of the third coupling unit is connected with the radio frequency input end of the broadband microwave amplifier;
the input end of the fourth coupling unit is connected with the radio frequency output end of the broadband microwave amplifier, and the output end of the fourth coupling unit is connected with the fourth output end.
9. A vehicle-mounted radio frequency receiver is characterized in that,
comprising the amplifier of claim 1;
the high-power band-pass filter and the low-pass filter are also included;
the input end of the high-power band-pass filter receives an antenna signal, the output end of the high-power band-pass filter is connected with the input end of the low-pass filter, and the output end of the low-pass filter is connected with the input end of the first-stage low-noise amplifier.
10. The in-vehicle RF receiver of claim 9,
the first-stage low noise amplifier comprises a first low noise amplifier and a second low noise amplifier;
the second stage low gain amplifier comprises a first low gain amplifier and a second low gain amplifier;
the third stage low noise amplifier includes a third low noise amplifier and a fourth low noise amplifier.
11. The in-vehicle RF receiver of claim 10,
the input end of the first low-noise amplifier is connected with the output end of the low-pass filter, the output end of the first low-noise amplifier is connected with the input end of the first low-gain amplifier, the output end of the first low-noise amplifier is connected with the input end of the third low-noise amplifier, and the output end of the third low-noise amplifier is used for being connected with a first subsequent signal processing device;
the input end of the second low-noise amplifier is connected with the output end of the low-pass filter, the output end of the second low-noise amplifier is connected with the input end of the second low-gain amplifier, the output end of the second low-noise amplifier is connected with the input end of the fourth low-noise amplifier, and the output end of the fourth low-noise amplifier is used for being connected with a second subsequent signal processing device.
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| CN207283502U (en) * | 2017-09-26 | 2018-04-27 | 深圳市广源发电子有限公司 | A kind of Big Dipper gps antenna amplifying circuit |
| CN110764061A (en) * | 2019-10-31 | 2020-02-07 | 北京无线电测量研究所 | Orthogonal frequency conversion receiver |
| CN110888152A (en) * | 2018-09-11 | 2020-03-17 | 华为技术有限公司 | Vehicle-mounted equipment, navigation positioning information receiving device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6038460A (en) * | 1997-06-18 | 2000-03-14 | Lucent Technologies Inc. | Receiver for an RF signal booster in wireless communication system |
| CN201663583U (en) * | 2010-03-10 | 2010-12-01 | 广州市圣大电子有限公司 | Beidou low-noise amplifier |
| CN202167621U (en) * | 2011-07-05 | 2012-03-14 | 中国航空无线电电子研究所 | Electric tuning filtering active antenna used for DGPS beacon receiver |
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Application publication date: 20210430 |