CN117439683A - System and method for testing noise power of receiving frequency band of radio frequency power amplifier - Google Patents
System and method for testing noise power of receiving frequency band of radio frequency power amplifier Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/345—Interference values
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Abstract
The invention discloses a system and a method for testing the noise power of a receiving frequency band of a radio frequency power amplifier, wherein the system for testing the noise power of the receiving frequency band of the radio frequency power amplifier comprises a signal source, a power amplifier, a duplexer and a collecting and testing link; the signal source generates a modulation signal and transmits the modulation signal to the power amplifier to output power; the duplexer filters an input signal and an output signal of the power amplifier; the acquisition and test link acquires the input power and the output power of the power amplifier, acquires the filtered output signal of the power amplifier and displays the test result. The invention can accurately test the RxBN indexes of the radio frequency power amplifier monomer in different frequency bands, thereby judging whether the sensitivity deterioration risk is generated when the PA works in different frequency bands on a system board.
Description
Technical Field
The invention relates to the technical field of performance test of radio frequency integrated circuit chip amplifiers, in particular to a system and a method for testing noise power of a receiving frequency band of a radio frequency power amplifier.
Background
In modern communication systems, the Frequency Division Duplex (FDD) mode exists, and the transceiving channels are in different frequency bands, so that the problem of interference between the transceiving frequency bands can occur. In a radio frequency system, frequencies of receiving and transmitting channels of some FDD frequency bands are closely spaced, and because a system transmitting (Tx) signal is a signal amplified by a power amplifier, the power is usually higher, and a receiving (Rx) end usually receives a low-power signal, noise generated by the Tx signal in the whole receiving and transmitting link affects the sensitivity of the Rx end, and thus the sensitivity is deteriorated.
In addition, the received band noise power (RxBN) index actually reflects whether the Power Amplifier (PA) generates a risk of sensitivity degradation in the end system application, and the conventional test method is to test the whole transceiver system by placing the PA on a system board, but the following problems exist:
1. the verification time of the radio frequency power amplifier chip on the system board is generally the later period of research and development, and the problem of sensitivity deterioration is likely to be found out not enough in time so as to rework and change the design; 2. the problem of sensitivity deterioration caused by the system verification difference between the system boards of different terminal manufacturers and different verification platforms; 3. the lack of means to monitor the deterioration of sensitivity at the beginning of chip design can lead to defects in the chip design, which can create uncontrollable difficulties in later system applications.
Therefore, in the design of the rf power amplifier chip, it is necessary to provide a system and a method for testing the noise power of the receiving band of the rf power amplifier to effectively solve the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a system and a method for testing noise power of a receiving frequency band of a radio frequency power amplifier, which can accurately test RxBN indexes of a single radio frequency power amplifier in different frequency bands so as to judge whether sensitivity deterioration risks are generated when a PA works in different frequency bands on a system board.
In order to solve the technical problems, the invention provides a receiving frequency band noise power test system of a radio frequency power amplifier, which comprises a signal source, a power amplifier, a duplexer and a collecting and testing link;
the signal source generates a modulation signal and transmits the modulation signal to the power amplifier to output power;
the duplexer filters an input signal and an output signal of the power amplifier;
the acquisition and test link acquires the input power and the output power of the power amplifier, acquires the filtered output signal of the power amplifier and displays a test result.
Further, the device also comprises an isolator; the isolator is arranged between the power amplifier and the duplexer and is used for preventing the out-of-band mismatch of the duplexer from causing impedance offset of the input end and the output end of the power amplifier.
Further, the method further comprises the following steps:
the power amplifier is arranged in the shielding box, and the signal source, the duplexer and the acquisition and test link are all arranged outside the shielding box;
and the power supply is used for adjusting the working voltage connected to the power amplifier.
Further, the duplexer includes:
the input end duplexer is used for filtering the modulation signal and transmitting the filtered signal to the power amplifier;
and the output end duplexer receives the output power of the power amplifier corresponding to the receiving frequency band and filters the output signal.
Further, the duplexer includes a transmitting end and a receiving end.
Further, the transmitting end of the input end duplexer filters the modulation signal, and the receiving end is used for connecting a load.
Further, the receiving end of the output end duplexer receives the output power of the power amplifier corresponding to the receiving frequency band, and the transmitting end is used for connecting a load.
Further, the acquisition and test link includes:
a power probe for detecting the input power and the output power of the power amplifier;
and the spectrometer displays the final test result.
In addition, the invention also provides a receiving frequency band noise power testing method of the radio frequency power amplifier, which adopts the receiving frequency band noise power testing system of the radio frequency power amplifier, and specifically comprises the following steps:
the signal source generates a modulation signal and transmits the modulation signal to the duplexer for signal filtering;
the power amplifier receives the filtered signal and outputs power;
the duplexer receives the output power of the power amplifier corresponding to the receiving frequency band and performs signal filtering on the output signal of the power amplifier;
and judging the noise power condition according to the input power and the output power of the power amplifier and the filtered output signal.
Further, the method further comprises the following steps: turning on a signal source to emit a modulation signal corresponding to the test frequency point, and detecting the input power P at the input port of the power amplifier in Detecting the output power P at the output port of the power amplifier out Adjusting the input power P in Up to output power P out Reaching rated power P rated Record input power P in 。
Further, the method further comprises the following steps: resetting the frequency spectrograph, setting the start-stop frequency displayed by the frequency spectrograph, and judging the noise power condition according to the recorded input power corresponding to the transmitting frequency point and the result corresponding to the filtered output signal on the frequency spectrograph.
Further, the start-stop frequency includes a transmission frequency and a reception frequency range of the measured frequency band.
Further, the built-in attenuation of the spectrometer is 0-1 dB, the compensation value is set at 2-3 dB, the reference amplitude is set at-35 to-40 dBm, and the amplitude interval is set at 3-5 dB.
Further, the method further comprises the following steps: and opening an internal pre-amplifier of the frequency spectrograph, reducing the background noise, and setting the test bandwidth to be 50-150 KHZ, so that the range of the background noise value can be observed when the power supply of the power amplifier is closed, and whether the test background noise requirement is met or not.
Through the technical scheme, the invention has the following beneficial effects:
setting a signal source, a power amplifier, a duplexer and a collection and test link; the signal source generates a modulation signal and transmits the modulation signal to the power amplifier to output power; the duplexer filters an input signal and an output signal of the power amplifier; the acquisition and test link acquires the input power and the output power of the power amplifier, acquires the filtered output signal of the power amplifier and displays the test result. The system can accurately test RxBN indexes of the radio frequency power amplifier monomers in different frequency bands, so as to judge whether sensitivity deterioration risks are generated when the PA works in different frequency bands on a system board.
Drawings
Fig. 1 is a schematic diagram of an overall structure of a receiving band noise power test system of a radio frequency power amplifier according to an embodiment of the invention;
FIG. 2 is a flow chart of a method for testing the noise power of a receiving band of a radio frequency power amplifier according to an embodiment of the invention;
fig. 3 is a schematic diagram of a background noise test when PA power is turned off in a method for testing noise power in a receiving band of a radio frequency power amplifier according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a noise power test during normal operation of a PA according to a method for testing noise power in a receiving band of a radio frequency power amplifier according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of the overall structure of a conventional RF front end;
FIG. 6 is a schematic diagram illustrating a background noise test when a B8 duplexer is used in a method for testing noise power in a receiving band of a radio frequency power amplifier according to an embodiment of the present invention;
fig. 7 is a diagram of noise power test data when a B8 duplexer is used in a method for testing noise power of a receiving band of a radio frequency power amplifier according to an embodiment of the present invention.
Detailed Description
A system and method for testing the noise power of a receiving band of a radio frequency power amplifier according to the present invention will be described in more detail with reference to the accompanying drawings, in which preferred embodiments of the present invention are shown, it being understood that one skilled in the art can modify the invention described herein while still achieving the advantageous effects of the invention. Accordingly, the following description is to be construed as broadly known to those skilled in the art and not as limiting the invention.
The invention is more particularly described by way of example in the following paragraphs with reference to the drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.
As shown in fig. 1, an embodiment of the present invention provides a system for testing noise power in a receiving band of a radio frequency power amplifier, which includes a signal source, a Power Amplifier (PA), a duplexer, and a collecting and testing link.
Specifically, the signal source generates a modulation signal and transmits the modulation signal to the power amplifier to output power; the duplexer filters an input signal and an output signal of the power amplifier; the acquisition and test link acquires the input power and the output power of the power amplifier, acquires the filtered output signal of the power amplifier and displays a test result.
Further, the embodiment further comprises an isolator. Specifically, the isolator is arranged between the power amplifier and the duplexer and is used for preventing the out-of-band mismatch of the duplexer from causing impedance offset of the input end and the output end of the power amplifier.
More specifically, the isolator can prevent the impedance shift of the PA input and output ports due to the out-of-band mismatch of the diplexer, and can ensure the impedance of the PA input and output ports to be around 50 ohms.
In addition, the embodiment also comprises a shielding box and a power supply. Specifically, the power amplifier is arranged in the shielding box, and the signal source, the duplexer and the acquisition and test link are all arranged outside the shielding box; and a power supply for adjusting the operating voltage connected to the power amplifier.
The shielding box can shield various electromagnetic signals in the environment, and test errors caused by interference are prevented.
In this embodiment, the duplexer includes: an input diplexer and an output diplexer. Specifically, the input end duplexer filters the modulation signal and transmits the filtered signal to the power amplifier; and the output end duplexer receives the output power of the power amplifier corresponding to the receiving frequency band and filters the output signal.
Further, the duplexer includes a transmitting end (Tx) and a receiving end (Rx).
In one embodiment, the modulated signal is filtered by a transmitting end (Tx) of the input duplexer and a receiving end (Rx) is connected to a load.
More specifically, the input end diplexer walks the transmitting port, filters harmonic signals and other frequency signals of non-corresponding transmitting frequency bands, and meanwhile, the receiving port needs to be connected with a 50 ohm end connector to prevent power reflection (namely, the receiving end is used for connecting a 50 ohm load).
In an embodiment, a receiving end (Rx) of the output end duplexer receives the output power of the power amplifier corresponding to the receiving frequency band, and a transmitting end (Tx) is used for connecting a load.
More specifically, the output end duplexer is used for receiving the power of the corresponding receiving frequency band, filtering the signals of other non-corresponding receiving frequency bands, and meanwhile, the transmitting end needs to be connected with a 50 ohm end connector capable of absorbing high power to prevent power reflection (namely, the transmitting end is used for connecting a 50 ohm load).
In this embodiment, the acquisition and test link includes: power probes and spectrometers. Specifically, a power probe detects the input power and the output power of the power amplifier; and the spectrometer displays the final test result.
In addition, as shown in fig. 2, the embodiment further provides a method for testing the noise power of the receiving frequency band of the radio frequency power amplifier, which adopts the system for testing the noise power of the receiving frequency band of the radio frequency power amplifier, and specifically includes the following steps:
s1, a signal source generates a modulation signal and transmits the modulation signal to a duplexer for signal filtering;
s2, the power amplifier receives the filtered signals and outputs power;
s3, the duplexer receives the output power of the corresponding receiving frequency band of the power amplifier and performs signal filtering on the output signal of the power amplifier;
s4, judging the noise power condition according to the input power and the output power of the power amplifier and the filtered output signal.
Preferably, the present embodiment further includes: turning on a signal source to emit a modulation signal corresponding to the test frequency point, and detecting the input power P at the input port of the power amplifier in Detecting the output power P at the output port of the power amplifier out Adjusting the input power P in Up to output power P out Reaching rated power P rated Record input power P in . The multiple frequency points may repeat the above operations.
Further, the embodiment further includes: resetting the frequency spectrograph, setting the start-stop frequency displayed by the frequency spectrograph, and judging the noise power condition according to the recorded input power corresponding to the transmitting frequency point and the result corresponding to the filtered output signal on the frequency spectrograph.
Wherein the start-stop frequency comprises a transmitting frequency and a receiving frequency range of the measured frequency band.
In a specific example, the built-in attenuation of the spectrometer is 0-1 dB, the compensation value is set at 2-3 dB, the reference amplitude is set at-35 to-40 dBm, and the amplitude interval is set at 3-5 dB.
Further, the embodiment further includes: the internal pre-amplifier of the spectrometer is turned on to reduce the background noise and the test bandwidth is set to 50-150 KHZ (e.g., preferably 100 KHZ) so that the range of background noise values can be observed when the power supply to the power amplifier is turned off, and whether the test background noise requirement is met.
In one embodiment, the method for testing the noise power of the receiving band of the radio frequency power amplifier comprises the following specific steps: with reference to the 3GPP protocol (third generation partnership project), a modulation signal required for the test is generated, for example, an fdd_lte_5m_1rb signal is generated to the signal source. The test PA (power amplifier) is placed in a shielded box. The input end and the output end of the PA are respectively added with a duplexer (such as an input end duplexer and an output end duplexer) corresponding to the test frequency band, the input end duplexer walks through the transmitting port to filter harmonic signals and other frequency signals not corresponding to the transmitting frequency band, and meanwhile, the receiving port is required to be connected with a 50 ohm end connector to prevent power reflection; the output end duplexer is used for receiving the power of the corresponding receiving frequency band, filtering the signals of other non-corresponding receiving frequency bands, and meanwhile, the transmitting end needs to be connected with a 50 ohm end connector capable of absorbing high power to prevent power reflection.
Further, the PA is powered on to work normally, a signal source is turned on to transmit a modulation signal corresponding to the test frequency point, and the input power P is detected at the input port of the PA in Detecting output power P at a PA output port out Regulating the input power to the output power P out Reaching rated power P rated Recording the input power at this time, the multi-frequency point can repeat the above steps. The spectrometer is reset by Preset on the spectrometer. Setting the start-stop frequency displayed by the spectrometer, the range of the transmitting frequency and the receiving frequency of the measured frequency band, setting the built-in attenuation Att of the spectrometer to be 0dB, setting the Offset value Offset to be 2-3 dB (the insertion loss caused by the passive devices of the output path), and setting the reference amplitude Ref level to be 4dB at the amplitude interval generally between-35 dBm and-40 dBm. The spectrometer is opened to pre-put the preamplifier (built-in preamplifier), the background noise is further reduced, the testing bandwidth RBW is set to 100kHz, the background noise can be observed to be about-114 dBm/100kHz when the power supply of the PA is closed, and the background noise is converted to be about 163dBm/Hz, so that the requirement of testing background noise is met, as shown in figure 3. Setting the transmitting frequency and the receiving frequency of a Marker point marking test frequency band on a frequency spectrograph, selecting and opening a Marker Table, recording the reading values of all Marker points in real time, testing three frequency points of low, medium and high in each frequency band, and enabling the receiving frequency points to correspond to the transmitting frequency points one by one. And the PA is powered on to work normally, the input power corresponding to the transmitting frequency point is recorded, and the Marker point reading value corresponding to the receiving frequency point on the spectrometer is observed and recorded. This procedure was repeated to complete the test, the test results are shown in FIG. 4.
In fig. 3 and 4, M1 and M2 are Marker click values.
As shown in fig. 5, in the conventional wireless communication system, the rf front-end module generally plays an important role in transmitting and receiving wireless radio frequency signals, and the rf PA (radio frequency power amplifier) is a core device in the rf front-end, and meanwhile, the influence degree of noise generated by the PA (power amplifier) during operation on the Rx (receiving) end is one of important indexes for evaluating the advantages and disadvantages of the rf PA (radio frequency power amplifier). The radio frequency front end module receives and transmits the shared antenna, the power transmitted by the transmitting end is always larger, and the power received by the receiving end is generally very small, so that the signal received by the receiving end has a certain noise influence. However, since the noise factor of the LNA (bottom noise amplifier) at the receiving end is small, the noise power at the transmitting end can be considered to have no influence on the receiving sensitivity as long as the received noise power does not exceed a certain threshold.
The sensitivity reception formula is as follows: s=10 l g (KT) +10l g (BW) +nf+snr. As can be seen from the formula, the sensitivity is related to four factors, namely thermal noise, system noise figure, minimum signal to noise ratio of the useful signal required by the system and signal bandwidth. Wherein the first term 10lg (KT) represents the thermal noise power at normal temperature-174 dBm/Hz, at absolute zero-273 ℃ electrons are considered to be motionless, the background noise at this time is-174 dBm/Hz, electrons are active at room temperature, but the background noise increase is very limited, the background noise at room temperature is also noted as-174 dBm/Hz for the sake of calculation convenience, and the noise power at the transmitting end affects it, thereby creating a risk of sensitivity deterioration.
In a specific embodiment, taking a B8 (wireless communication band) test as an example, the following steps are taken for the influence of noise power generated by a transmitting end PA (power amplifier) on the sensitivity of a receiving end:
s100, referring to the 3GPP protocol (third generation partnership project), an fdd_lte_5m_1rb signal is generated to the signal source.
S200, placing a test PA (power amplifier) into a shielding box for shielding various electromagnetic signals in the environment and preventing test errors caused by interference.
S300, adding B8 diplexers (the B8 diplexer connected with the input end of the PA is an input end diplexer and the B8 diplexer connected with the output end of the PA is an output end diplexer) to the input end and the output end of the PA respectively, wherein the input end diplexer is provided with a transmitting port, filtering harmonic signals and other frequency signals of a non-B8 transmitting frequency band, and meanwhile, a receiving port is required to be connected with a 50 ohm end connector to prevent power reflection; the output end duplexer is used for receiving the power of the B8 receiving frequency band, filtering the signals of other non-B8 receiving frequency bands, and meanwhile, the transmitting end needs to be connected with a 50 ohm end connector capable of absorbing high power, so that power reflection is prevented.
And S400, an isolator capable of containing a B8 uplink and downlink frequency band (880-960 MHz) is needed to be connected between the input end of the PA and the input end duplexer and between the output end of the PA and the output end duplexer, so that the impedance offset of the input end and the output end of the PA caused by the out-of-band mismatch of the duplexer is prevented, and the isolator can ensure that the impedance of the input end and the output end of the PA is near 50 ohms.
S500, the PA is powered on to work normally, a signal source is turned on to transmit a modulated signal of a B8 low-frequency point, and input power P is detected at an input port of the PA in Detecting output power P at a PA output port out Regulating the input power to the output power P out Reaching rated power P rated Recording the input power at the moment, and repeating the steps at the medium-high frequency point or the multi-frequency point.
S600, resetting the spectrometer, setting the start-stop frequency displayed by the spectrometer, setting the range of the transmitting frequency and the receiving frequency which need to contain the measured frequency band, setting the built-in attenuation of the spectrometer to be 0dB, setting the compensation value to be 2-3 dB (the insertion loss caused by the passive devices of the output path), setting the reference amplitude to be-35 dBm to-40 dBm, and setting the amplitude interval to be 4dB.
S700, setting Trace Mode of the spectrometer as Average, enabling a line display Mode to be smoother, and enabling a detection Mode Detector to select RMS/Average, so that test values in a frequency band are more balanced.
S800, the spectrometer is opened to pre-put the pre-amp, the Low Band 3.6GHz option is selected, so that the background noise is further reduced, the test bandwidth RBW is set to be 100kHz, the background noise can be observed to be about-114 dBm/100kHz when the power supply of the PA is closed, and the converted background noise is about 163dBm/Hz, so that the test background noise requirement is met, as shown in fig. 3.
S900, setting the transmitting frequency (such as 880MHz, 897.5MHz or 915 MHz) and the receiving frequency (such as 925MHz, 942.5MHz or 960 MHz) of a Marker point mark B8 on the spectrometer, then selecting and opening a Marker Table on the spectrometer, and recording the read values of all Marker points in real time.
S1000, the PA is powered on to work normally, the signal source transmits the input power (taking the transmitting frequency 880MHz as an example for testing) corresponding to the transmitting frequency point recorded in the step S500, the Marker point reading value corresponding to the receiving frequency point on the spectrometer is observed and recorded according to the step S900, and the testing result is shown in the data of fig. 6 and 7.
In this embodiment, the signal source generates a modulated signal and transmits the modulated signal to the duplexer for signal filtering; the power amplifier receives the filtered signal and outputs power; the duplexer receives the output power of the corresponding receiving frequency band of the power amplifier and performs signal filtering on the output signal of the power amplifier; resetting the frequency spectrograph, setting the start-stop frequency displayed by the frequency spectrograph, and judging the noise power condition according to the recorded input power corresponding to the transmitting frequency point and the result corresponding to the filtered output signal on the frequency spectrograph.
In summary, the system and the method for testing the noise power of the receiving frequency band of the radio frequency power amplifier provided by the invention have the following advantages:
setting a signal source, a power amplifier, a duplexer and a collection and test link; the signal source generates a modulation signal and transmits the modulation signal to the power amplifier to output power; the duplexer filters an input signal and an output signal of the power amplifier; the acquisition and test link acquires the input power and the output power of the power amplifier, acquires the filtered output signal of the power amplifier and displays the test result. The system can accurately test RxBN indexes of the radio frequency power amplifier monomers in different frequency bands, so as to judge whether sensitivity deterioration risks are generated when the PA works in different frequency bands on a system board.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (14)
1. The system is characterized by comprising a signal source, a power amplifier, a duplexer and a collection and test link;
the signal source generates a modulation signal and transmits the modulation signal to the power amplifier to output power;
the duplexer filters an input signal and an output signal of the power amplifier;
the acquisition and test link acquires the input power and the output power of the power amplifier, acquires the filtered output signal of the power amplifier and displays a test result.
2. The system for testing the noise power of the receive band of a radio frequency power amplifier of claim 1, further comprising an isolator; the isolator is arranged between the power amplifier and the duplexer and is used for preventing the out-of-band mismatch of the duplexer from causing impedance offset of the input end and the output end of the power amplifier.
3. The receive band noise power test system of a radio frequency power amplifier of claim 1, further comprising:
the power amplifier is arranged in the shielding box, and the signal source, the duplexer and the acquisition and test link are all arranged outside the shielding box;
and the power supply is used for adjusting the working voltage connected to the power amplifier.
4. The system for testing the noise power of the reception band of a radio frequency power amplifier according to claim 1, wherein the duplexer comprises:
the input end duplexer is used for filtering the modulation signal and transmitting the filtered signal to the power amplifier;
and the output end duplexer receives the output power of the power amplifier corresponding to the receiving frequency band and filters the output signal.
5. The system for testing noise power in a receive band of a radio frequency power amplifier of claim 4, wherein the diplexer comprises a transmit side and a receive side.
6. The system of claim 5, wherein the transmitter of the input diplexer filters the modulated signal and the receiver is coupled to a load.
7. The system of claim 5, wherein the receiving end of the output duplexer receives the output power of the power amplifier corresponding to the receiving frequency band, and the transmitting end is used for connecting with a load.
8. The receive band noise power test system of a radio frequency power amplifier of claim 1, wherein the acquisition and test link comprises:
a power probe for detecting the input power and the output power of the power amplifier;
and the spectrometer displays the final test result.
9. A method for testing the noise power of a receiving band of a radio frequency power amplifier, which is a system for testing the noise power of a receiving band of a radio frequency power amplifier according to any one of claims 1 to 8, comprising the steps of:
the signal source generates a modulation signal and transmits the modulation signal to the duplexer for signal filtering;
the power amplifier receives the filtered signal and outputs power;
the duplexer receives the output power of the power amplifier corresponding to the receiving frequency band and performs signal filtering on the output signal of the power amplifier;
and judging the noise power condition according to the input power and the output power of the power amplifier and the filtered output signal.
10. The method for testing the noise power of the reception band of a radio frequency power amplifier according to claim 9, further comprising: turning on a signal source to emit a modulation signal corresponding to the test frequency point, and detecting the input power P at the input port of the power amplifier in Detecting the output power P at the output port of the power amplifier out Adjusting the input power P in Up to output power P out Reaching rated power P rated Record input power P in 。
11. The method for testing the noise power of the reception band of a radio frequency power amplifier according to claim 10, further comprising: resetting the frequency spectrograph, setting the start-stop frequency displayed by the frequency spectrograph, and judging the noise power condition according to the recorded input power corresponding to the transmitting frequency point and the result corresponding to the filtered output signal on the frequency spectrograph.
12. The method of claim 11, wherein the start-stop frequencies comprise a transmit frequency and a receive frequency range of the measured frequency band.
13. The method for testing noise power of a receiving band of a radio frequency power amplifier according to claim 12, wherein the built-in attenuation of the spectrometer is 0-1 dB, the compensation value is set to 2-3 dB, the reference amplitude is set to-35 to-40 dBm, and the amplitude interval is set to 3-5 dB.
14. The method for testing the noise power of the receive band of a radio frequency power amplifier of claim 13, further comprising: and opening an internal pre-amplifier of the frequency spectrograph, reducing the background noise, and setting the test bandwidth to be 50-150 KHZ, so that the range of the background noise value can be observed when the power supply of the power amplifier is closed, and whether the test background noise requirement is met or not.
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