CN112737527B

CN112737527B - Calibration system and method for harmonic elimination of broadband radio frequency power amplifier

Info

Publication number: CN112737527B
Application number: CN202110355917.3A
Authority: CN
Inventors: 刘旭伟; 范焕新; 钱立鑫; 李凯
Original assignee: Foshan Linkage Technology Co ltd
Current assignee: Foshan Linkage Technology Co ltd
Priority date: 2021-04-01
Filing date: 2021-04-01
Publication date: 2021-07-09
Anticipated expiration: 2041-04-01
Also published as: CN112737527A

Abstract

The invention discloses a calibration system and a method for harmonic elimination of a broadband radio frequency power amplifier, wherein the system comprises radio frequency signal receiving and transmitting processing equipment, a transmitting channel, an auxiliary circuit and a calibration circuit; the radio frequency signal receiving and transmitting processing equipment comprises an ATE radio frequency signal source, an ATE radio frequency receiver, a calibration control port and a transmitting control port; the auxiliary circuit comprises M auxiliary channels, and the transmitting channel comprises a first broadband power divider, a broadband power synthesizer, a final amplifier and a first low-pass filter; the input end of the calibration circuit is connected with the radio frequency output end of the transmitting channel, and the output end of the calibration circuit is connected with the ATE radio frequency receiver. The design of a segmented high-power filter is not needed, the filter is not needed to be switched, the harmonic suppression function can be quickly realized only by calibrating, the harmonic suppression function can be applied to eliminating the harmonic generated by the radio frequency power amplifier in a full frequency band, and the production efficiency can be improved in an automatic test.

Description

Calibration system and method for harmonic elimination of broadband radio frequency power amplifier

Technical Field

The invention relates to the technical field of radio frequency semiconductor automatic testing, in particular to a system and a method for calibrating harmonic elimination of a broadband radio frequency power amplifier.

Background

In the radio frequency semiconductor automation test requirement, many radio frequency chips under test (DUTs) have radio frequency high power requirement, such as some radio frequency switches, radio frequency power amplifiers, and the like. The DUT has strict requirements on test specifications, and therefore generally has higher requirements on performance specifications of the test equipment, such as harmonic suppression capability.

Harmonics are inherent products of radio frequency power amplifiers. Harmonics are often useless and tend to interfere with other signals at the harmonics, and thus harmonic filtering of power amplifiers is important. Harmonic filtering of power amplifiers is often implemented with filters.

In a narrow-band radio frequency power amplifier, harmonic suppression is easy, and can be realized by only needing a low-pass filter or a band-pass filter. In the broadband radio frequency power amplifier, in order to suppress harmonics generated by the power amplifier, the amplifiers in different frequency bands are required to be realized together, a filter is selected according to the frequency transmitted by the power amplifier, and at this time, the power amplifier needs to be switched through a high-power radio frequency switch according to different frequencies. The low-frequency radio frequency power amplifier can be switched by using a diode or a radio frequency relay, and the high-frequency radio frequency relay can be switched by using the radio frequency relay, but the high-frequency radio frequency relay is difficult to pass through large radio frequency power, so that a certain bottleneck can be caused. And the volume of the filter is usually proportional to the power passed through, so the broadband radio frequency power radio frequency amplifier usually has larger volume and weight because a plurality of filters with large volume are needed.

The performance of the narrow-band filter is easy to realize, so narrow-band communication is generally adopted in communication, but harmonic suppression is required to be carried out on various filters because different DUTs need to be faced in radio frequency test, the flexibility and the production efficiency are greatly reduced by adopting manual replacement, and extra troubles are brought by misoperation.

The switch built by the diode is used for switching the filter, misoperation can be avoided, but the response time of the diode is slow, the production efficiency of an automatic production line can be greatly reduced, the insertion loss of the diode switch is large, the loss needs to be compensated by a power amplifier, so that the power amplifier has higher power requirement, the higher power requirement means further design difficulty and higher harmonic wave, the requirement on the index of the filter can be further improved, and further, the diode is a nonlinear device, so that the diode can generate harmonic wave, and the scheme is not suitable for application with high requirement on harmonic wave inhibition capability.

At present, a microwave relay is adopted to realize smaller insertion loss and higher frequency bandwidth. However, the time response of the microwave relay is very slow, and the testing efficiency is also seriously influenced. And because the electric shock structure of the relay, it is easier to reduce the performance, therefore to the radio frequency test occasion of high requirement, adopt microwave relay and just mean frequently changing, and higher cost. And often high frequency microwave relays do not have very high power passing capability, thus causing application limitations.

And the power capacity of the filter is always proportional to the volume, and the larger bandwidth and the larger power mean the larger volume. The specific filter has a certain harmonic suppression capability, and in a power amplifier with larger harmonic, the harmonic suppression capability cannot meet the design requirement, so that the filter has no universality.

Disclosure of Invention

The present invention provides a calibration system and method for harmonic cancellation in a wideband radio frequency power amplifier, which solves one or more of the problems of the prior art and provides at least one of the advantages.

In a first aspect, an embodiment of the present invention provides a calibration system for harmonic cancellation of a wideband radio frequency power amplifier, including: the device comprises radio frequency signal receiving and transmitting processing equipment, a transmitting channel, an auxiliary circuit and a calibration circuit;

the radio frequency signal receiving and transmitting processing equipment comprises an ATE radio frequency signal source, an ATE radio frequency receiver, a calibration control port and a transmitting control port;

the auxiliary circuit comprises M auxiliary channels, M = int ((fh-fl)/fl), fl is the lowest frequency of the bandwidth of the emission channel, fh is the highest frequency of the bandwidth of the emission channel, and int ((fh-fl)/fl) represents the rounding of the calculation result of (fh-fl)/fl;

the transmitting channel comprises a first broadband power divider, a broadband power synthesizer, a final amplifier and a first low-pass filter, an ATE radio-frequency signal source is connected with the input end of the first broadband power divider, the output end of the first broadband power divider is respectively connected with the input end of the auxiliary circuit and one input end of the broadband power synthesizer, the other M input ends of the broadband power synthesizer are connected with the output end of the auxiliary circuit, the output end of the broadband power synthesizer is sequentially connected with the final amplifier and the first low-pass filter, and the output end of the first low-pass filter serves as a radio-frequency output end;

the input end of the calibration circuit is connected with the radio frequency output end of the transmitting channel, and the output end of the calibration circuit is connected with the ATE radio frequency receiver;

the radio frequency signal receiving and transmitting processing equipment is connected with the auxiliary circuit through the transmitting control port and is used for controlling the state of the auxiliary channel;

the radio frequency signal receiving and transmitting processing equipment is connected with the calibration circuit through the calibration control port and used for controlling the state of the calibration circuit.

Further, the calibration circuit includes: the high-power attenuator comprises an attenuator, a first one-to-N switch, N feedback channels and a second one-to-N switch, wherein N = M +1, the input end of the high-power attenuator is connected with the radio-frequency output end of a transmitting channel, the output end of the high-power attenuator is connected with the input end of the feedback channels through the first one-to-N switch, the output end of the feedback channels is connected with an ATE radio-frequency receiver through the second one-to-N switch, and the radio-frequency signal receiving and transmitting processing equipment controls the states of the feedback channels of the calibration circuit through controlling the first one-to-N switch and the second one-to-N switch.

Furthermore, the auxiliary circuit further includes a matching circuit, a harmonic generator, and a second broadband power divider, where an input end of the matching circuit is an input end of the auxiliary circuit, and is connected to an output end of the first broadband power divider, an output end of the matching circuit is sequentially connected to the harmonic generator circuit and the second broadband power divider, the second broadband power divider has M output ends, and is respectively connected to an input end of each auxiliary channel, and an output end of each auxiliary channel is respectively connected to the other M input ends of the broadband power combiner.

Furthermore, the ith auxiliary channel comprises an ith high-pass filter, an ith phase shifter, an ith power regulator and an ith switch which are sequentially connected, the ith high-pass filter is connected with the output end of the second broadband power divider, one input end of the other M input ends of the broadband power combiner is connected with the ith switch, the radio-frequency signal receiving and transmitting processing equipment controls the ith switch to be switched on or off through the transmitting control port, and the ith phase shifter and the ith power regulator are controlled when the ith switch is switched onThe parameter of the device is used for controlling the state of the ith auxiliary channel,

。

furthermore, the N feedback channels comprise a through channel and M calibration channels, the M calibration channels comprise high-pass filters, the high-pass filter of the jth calibration channel is marked as an M + j high-pass filter, the through channel is formed by connecting the output end of the high-power attenuator with the second divide-by-N switch through the first divide-by-N switch, and the M + j high-pass filter is the same as the jth high-pass filter.

In a second aspect, an embodiment of the present invention further provides a calibration method for harmonic cancellation of a wideband radio frequency power amplifier, including:

s101, an ATE radio frequency signal source transmits a main signal at a preset frequency f, the main signal is sequentially transmitted to an ATE radio frequency receiver through a transmitting channel and a through passage of a calibration circuit, the transmitting power of the main signal is adjusted, the radio frequency output power of a radio frequency output end of the transmitting channel reaches a preset power P, the transmitting power of the main signal is P0 at the moment, and the radio frequency output power is determined according to a signal received by the ATE radio frequency receiver;

s102, setting t = 2;

s103, judging whether tf is satisfied

Wherein the auxiliary circuit comprises M auxiliary channels,

denotes the cut-off frequency of the high-pass filter of the jth auxiliary channel, tf being the frequency of the t harmonic; if yes, go to S104; if not, go to step S107;

s104, gating a jth auxiliary channel and a jth calibration channel of the calibration circuit, wherein the main signal is divided into two paths, one path of the main signal is output to the input end of the transmitting channel, the other path of the main signal is output to the jth auxiliary channel, a signal output by the jth auxiliary channel is combined with a signal received by the input end of the transmitting channel, and the combined signal sequentially passes through the transmitting channelAnd sending the channel and the jth calibration channel to an ATE radio frequency receiver, and adjusting the phase of a phase shifter of the jth auxiliary channel to ensure that the power of a signal received by the ATE radio frequency receiver through the jth calibration channel is minimum, and recording the phase of the phase shifter of the jth auxiliary channel as

；

S105, maintaining the phase of the phase shifter of the jth auxiliary channel as

And adjusting the power of the power adjuster of the jth auxiliary channel to ensure that the power of the signal received by the ATE radio frequency receiver through the jth calibration channel is minimum, wherein the power of the power adjuster of the jth auxiliary channel is equal to

Then, then

Calibration parameters for eliminating the t-th harmonic;

s106, t = t +1, go to step S103;

s107, finishing calibration, establishing frequency f, transmitting power P0, radio frequency output power P and all calibration parameters

And storing the corresponding relation, wherein the corresponding relation is used for directly calling when the harmonic elimination of the broadband radio frequency power amplifier is carried out on the signal with the frequency f and the radio frequency output power of P so as to realize the harmonic elimination.

Further, the determining the radio frequency output power according to a signal received by an ATE radio frequency receiver comprises: rf output power P = received power + loss of calibration circuit, where received power refers to the power of the signal received by the ATE rf receiver.

Further, the method further comprises: before step S101, determining the number M of auxiliary channels, M = int ((fh-fl)/fl), fl being the lowest frequency of the bandwidth of the emission channel, fh being the highest frequency of the bandwidth of the emission channel, and int ((fh-fl)/fl) indicating that the calculation result of (fh-fl)/fl is rounded.

Further, the method further comprises: prior to step S101, the cut-off frequency of the high-pass filter of each auxiliary channel is determined:

。

the system and the method for calibrating harmonic elimination of the broadband radio frequency power amplifier provided by the embodiment of the invention at least have the following beneficial effects: the calibration system includes: radio frequency signal receiving and dispatching processing equipment, transmission channel, auxiliary circuit, calibration circuit need not segmentation high-power filter design, need not switch over the wave filter, need not the wave filter of different frequencies and debugs alone, only need carry out calibration once, can call fast and realize the harmonic suppression function, can be applied to in the full frequency channel and eliminate the harmonic that radio frequency power amplifier produced, can improve production efficiency in automatic test.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.

Fig. 1 is a schematic structural diagram of a calibration system for harmonic cancellation of a wideband rf power amplifier according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a calibration system for harmonic cancellation of a wideband rf power amplifier according to another embodiment of the present invention;

FIG. 3 is a graph of harmonic power versus power of a power regulator according to an embodiment of the present invention;

fig. 4 is a graph of harmonic power versus power of a power regulator according to another embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It should be noted that although functional block divisions are provided in the system drawings and logical orders are shown in the flowcharts, in some cases, the steps shown and described may be performed in different orders than the block divisions in the systems or in the flowcharts. The terms first, second and the like in the description and in the claims, and the drawings described above, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

The RF input signal is assumed to be of amplitude 1 and frequency

Of the form:

；

since the signal will generate harmonics after passing through the amplifier, the signal output by the power amplifier can be considered to be in the form of:

；

where the ellipses are the respective higher order harmonic components. So that the amplitudes of the harmonics of the signal are in turn

In the order of phase

The amplitude of the main signal is A and the phase is

。

If not, the signals are output from the radio frequency output end, thereby influencing the signals. Conventionally, the signal is low-pass filtered, and the harmonic of the main signal is forcibly filtered by a low-pass filter. When applied to radio frequency testing, various filters are required for harmonic suppression.

When the harmonic elimination of the broadband high-power amplifier is carried out, the radio-frequency signal receiving and transmitting processing equipment, the transmitting channel and the auxiliary circuit in the figure 1 are adopted to carry out the harmonic elimination, and the design of a segmented high-power filter is not provided at the tail amplifier output end, and a full-band high-power low-pass filter, namely the first low-pass filter in the figure 1, is replaced. In the front stage of the power amplifier, a signal is divided into 2 paths through a full-band first broadband power divider, one path is used as a main signal part to generate a required high-power signal, the other part output by the first broadband power divider passes through a harmonic generation circuit to generate each subharmonic of the main signal, each subharmonic respectively inhibits components (including main signal frequency and low-frequency harmonic frequency) lower than the subharmonic frequency through different high-pass filters (1 st to Mth high-pass filters), the signals passing through the high-pass filters respectively enter corresponding phase shifters (1 st to Mth phase shifters) to respectively shift the phase of the signal, and then enter corresponding power adjusters (1 st to Mth power adjusters) to perform power adjustment on the phase-shifted signal. The signals after filtering, phase shifting and power adjustment and the main signal output by the first broadband power divider are combined into one signal by a broadband power combiner, the signals pass through a second low-pass filter to filter high-frequency signals above a broadband passband, then the signals passing through the second low-pass filter sequentially pass through a driving amplifier and a final-stage amplifier to amplify the signals, and finally the signals pass through the first low-pass filter again to be output.

The combination of the transmitting channel and the auxiliary circuit can realize the function of eliminating the harmonic in the radio frequency test, but to realize the harmonic elimination, the numerical values of each phase shifter and each power adjuster in the auxiliary circuit need to be determined, and how to obtain the accurate numerical values makes the harmonic elimination effect better become the problem to be solved urgently. Therefore, the invention firstly carries out calibration, can directly call calibration parameters in the practical harmonic elimination application, can improve the production efficiency in the automatic test, and enables the phase shift of the harmonic and the adjustment of the power in the auxiliary circuit to be more accurate, thereby improving the harmonic elimination effect.

As shown in fig. 1, a calibration system for harmonic cancellation of a wideband radio frequency power amplifier includes: the device comprises radio frequency signal receiving and transmitting processing equipment, a transmitting channel, an auxiliary circuit and a calibration circuit;

the transmitting channel comprises a first broadband power divider, a broadband power synthesizer, a final amplifier and a first low-pass filter, wherein an ATE radio-frequency signal source is connected with the input end of the first broadband power divider, the output end of the first broadband power divider is respectively connected with the input end of the auxiliary circuit and one input end of the broadband power synthesizer, the other M input ends of the broadband power synthesizer are connected with the output end of the auxiliary circuit, the output end of the broadband power synthesizer is sequentially connected with the final amplifier and the first low-pass filter, and the output end of the first low-pass filter is used as a radio-frequency output end;

the input end of the calibration circuit is connected with the radio frequency output end of the transmitting channel, the output end of the calibration circuit is connected with the ATE radio frequency receiver, the calibration circuit comprises N feedback channels, wherein N = M + 1;

Specifically, the state of the auxiliary channel is controlled to control the connection or disconnection of the auxiliary channel, and parameters of the auxiliary channel during connection, and the auxiliary channel is controlled to be connected or disconnected, that is, the auxiliary channel is controlled to be connected with the transmitting channel, or the auxiliary channel is disconnected from the transmitting channel; the state of the control feedback channel refers to controlling the on or off of the feedback channel, namely controlling the feedback channel to be respectively connected with the radio frequency output end and the ATE radio frequency receiver, or disconnecting the feedback channel from the radio frequency output end and the ATE radio frequency receiver.

In one embodiment, the calibration circuit includes: attenuator, first divide into N switch, N feedback channel, second divide into N switch, wherein N = M +1, and the input of attenuator is connected with the radio frequency output of transmission channel, and the output of attenuator is connected with the input of feedback channel through first divide into N switch, and the output of feedback channel is connected with ATE radio frequency receiver through second divide into N switch. Because the radio frequency signal receiving and transmitting processing equipment can not transmit and receive high-power signals, the attenuator is adopted to attenuate the high-power radio frequency signals into low-power radio frequency signals.

In an embodiment, the auxiliary circuit further includes a matching circuit, a harmonic generator, and a second broadband power divider, where an input end of the matching circuit is an input end of the auxiliary circuit, and is connected to an output end of the first broadband power divider, an output end of the matching circuit is sequentially connected to the harmonic generator and the second broadband power divider, the second broadband power divider has M output ends, and is respectively connected to an input end of each auxiliary channel, and an output end of each auxiliary channel is respectively connected to the other M input ends of the broadband power combiner.

In an embodiment, the ith auxiliary channel includes an ith high-pass filter, an ith phase shifter, an ith power regulator and an ith switch, which are connected in sequence, the ith high-pass filter is connected with the output end of the second broadband power divider, one of the other M input ends of the broadband power combiner is connected with the ith switch, the radio frequency signal transceiving processing device controls the ith switch to be turned on or off through the transmission control port, and controls the parameters of the ith phase shifter and the ith power regulator when the ith switch is turned on to realize the control of the state of the ith auxiliary channel,

。

in an embodiment, the N feedback channels include a through path and M calibration channels, each of the M calibration channels includes a high-pass filter, and the high-pass filter of the jth calibration channel is denoted as an M + j high-pass filter, where the through path is a connection between the output end of the high-power attenuator and the second divide-by-N switch through the first divide-by-N switch, and the M + j high-pass filter is the same as the jth high-pass filter. The radio frequency signal receiving and transmitting processing equipment controls the first one-to-N switch and the second one-to-N switch through the calibration control port to control the state of the feedback channel.

In an embodiment, the transmission channel further includes a gain module, which is disposed between the ATE rf signal source and the first broadband power divider, and performs gain amplification on the main signal output by the ATE rf signal source.

In one embodiment, the transmission channel further includes a second low-pass filter and two driving amplifiers, the second low-pass filter and the two driving amplifiers are connected in sequence and are arranged between the broadband power combiner and the final amplifier, and the second low-pass filter is arranged to filter high-frequency signals above a broadband passband because harmonic generation circuits in the auxiliary circuit can generate harmonics of various orders.

In an embodiment, the radio frequency signal transceiving processing device further comprises a digital signal processor, the digital signal processor controls the on and off of the first one-to-N switch and the second one-to-N switch in the calibration circuit through the calibration control port, and the digital signal processor controls the on and off of the 1 st-M switches in the auxiliary circuit through the transmission control port and controls the phase shifter and the power adjuster to adjust.

The embodiment of the invention also provides a correction method for eliminating harmonic waves of the broadband high-power amplifier, which is applied to the calibration device shown in the figure 1 and comprises the following steps of S101-S107:

s102, setting t = 2;

s103, judging whether tf is satisfied

Wherein the auxiliary circuit comprises M auxiliary channels,

denotes the cut-off frequency of the jth high-pass filter of the jth auxiliary channel, tf being the frequency of the t harmonics; if yes, go to S104; if not, go to step S107;

s104, gating the jth auxiliary channel and the jth calibration channel of the calibration circuit, wherein the main signal is divided into two paths, one path is output to the input end of the transmitting channel, the other path is output to the jth auxiliary channel, a signal output by the jth auxiliary channel is combined with a signal received by the input end of the transmitting channel, the combined signal is sequentially transmitted to the ATE radio frequency receiver through the transmitting channel and the jth calibration channel, the phase shifter of the jth auxiliary channel is subjected to phase adjustment, so that the power of the signal received by the ATE radio frequency receiver through the jth calibration channel is minimum, and the phase of the phase shifter of the jth auxiliary channel is recorded as

；

In step S104, the phase shifter of the jth auxiliary channel is adjusted to minimize the power of the signal received by the ATE radio frequency receiver through the jth calibration channel, and the phase of the phase shifter of the jth auxiliary channel is recorded as

Comprising steps S1041-S1042:

s1041, adjusting the phase of the phase shifter of the jth auxiliary channel, testing the phase of 360 degrees in total, stepping the phase shifter of each jth auxiliary channel once, and obtaining the power of the received signal by an ATE radio frequency receiver, wherein the power is recorded as t-order harmonic power, so as to form a phase and t-order harmonic power corresponding table;

s1042, searching the phase corresponding to the minimum value of the t-th harmonic power from the phase and t-th harmonic power corresponding table, and recording the phase as the minimum value

The phase of the phase shifter as the jth auxiliary channel.

And adjusting the power of the power adjuster of the jth auxiliary channel to ensure that the power of a signal received by the ATE radio frequency receiver through the jth calibration channel of the calibration circuit is minimum, wherein the power of the power adjuster of the jth auxiliary channel is equal to

Then, then

Calibration parameters for eliminating the t-th harmonic;

in one embodiment, the calibration parameters may be calibrated first

And storing.

In step S105, the power of the power regulator of the jth auxiliary channel is adjusted so that the power of the signal received by the ATE radio frequency receiver through the jth calibration channel is the minimum, where the power of the power regulator of the jth auxiliary channel is recorded as

Includes steps S1051-S1054:

s1051, reducing the power of the power regulator of the jth auxiliary channel, and changing the power of a signal received by the ATE radio frequency receiver through the jth calibration channel;

s1052, if the power of the signal received by the ATE radio frequency receiver is reduced, continuing to reduce the power of the power regulator of the jth auxiliary channel until the power of the signal received by the ATE radio frequency receiver is increased when the power of the signal received by the ATE radio frequency receiver is adjusted again, and recording the power regulator of the jth auxiliary channel as pj1 when the power of the signal received by the ATE radio frequency receiver is minimum;

s1053, if the power of the ATE radio frequency receiver for receiving the signal is increased, the power of the power regulator of the jth auxiliary channel is adjusted to be increased, the power of the signal received by the ATE radio frequency receiver is decreased, the power of the power regulator of the jth auxiliary channel is continuously adjusted to be increased until the power of the signal received by the ATE radio frequency receiver is increased when the power of the signal received by the ATE radio frequency receiver is adjusted again, and when the power of the signal received by the ATE radio frequency receiver is minimum, the power regulator of the jth auxiliary channel is marked as pj 2;

s1054, power of power regulator of jth auxiliary channel

Is pj1 or pj 2.

S106, t = t +1, go to step S103;

And storing the corresponding relation, wherein the corresponding relation is used for directly calling a signal with frequency f and radio frequency output power of P when the harmonic wave of the broadband high-power amplifier is eliminated so as to realize the harmonic wave elimination.

In one embodiment, the determining the radio frequency output power from a signal received by an ATE radio frequency receiver comprises: rf output power = received power + loss of calibration circuit, where received power refers to the power of the received signal of the ATE rf receiver.

In an embodiment, before step S101, determining the number M of auxiliary channels, M = int ((fh-fl)/fl), fl being the lowest frequency of the bandwidth of the emission channel, fh being the highest frequency of the bandwidth of the emission channel, and int ((fh-fl)/fl) indicating that the calculation result of (fh-fl)/fl is rounded.

In one embodiment, prior to step S101, the cut-off frequency of the high-pass filter of each auxiliary channel is determined,

。

in an embodiment, the rf signal transceiving processing device further includes a control register, and the calibration parameter is written into the control register.

Steps S101-S107 are performed to calibrate a signal with a frequency f and a radio frequency output power P, and obtain a set of calibration parameters and a transmission power of a main signal output by the ATE radio frequency signal source, where the set of calibration parameters is as follows:

，

,., writing calibration parameters into a control register, recording as Reg, repeating the steps S101-S107, calibrating for different frequencies and radio frequency output powers to obtain calibration data of full-band full power, and forming and storing the obtained calibration data of the full-band full power into a table 1, wherein in the table 1, m represents the number of frequencies, and n represents the number of powers. In practical application, the radio frequency signal transceiving processing device directly acquires the transmitting power of the main signal output by the corresponding ATE radio frequency signal source and the corresponding control register according to the requirements of different frequencies and radio frequency output powers, calls the corresponding calibration parameters from the corresponding control register, and needs to recalibrate the frequency and the radio frequency output power which are not in the table. Thereby being applicable to eliminating the harmonic generated by the radio frequency power amplifier in the whole frequency band. In table 1, for the calibration of the signal with the required output frequency Freq1 and the rf output Power of Power1, the transmission Power of the main signal output by the ATE rf signal source is P011, the corresponding control register is Reg11, the ATE rf signal source is controlled according to P011 and Freq1, and the phase shifter and the Power regulator of the calibration parameter control auxiliary circuit are called from Reg 11.

TABLE 1

Fig. 2 is a calibration system for harmonic cancellation of a wideband rf power amplifier according to another embodiment of the present invention, where a low-pass cut-off frequency of a high-pass filter of a lowest frequency of a high-pass filter is designed to be 2 times of a lowest frequency of a bandwidth, and the lowest cut-off frequency of the high-pass filter is stepped to the lowest frequency of the bandwidth, so as to prevent two adjacent harmonics from falling into the same high-pass filter, when the bandwidth ranges from 1GHz to 5.8GHz, according to a formula M = int ((fh-fl)/fl), M =4 is obtained, and N =5 of a calibration circuit needs 4 auxiliary channels, as shown in fig. 4. When the bandwidth ranges from 2GHz to 5.8GHz, M =1 is obtained according to the formula M = int ((fh-fl)/fl), and N =2 of the calibration circuit, only 1 auxiliary channel is needed.

The following examples are given for illustrative purposes with a bandwidth in the range of 1GHz to 5.8 GHz. The auxiliary channel and the calibration channel are both designed by using 4 high-pass filters. The 1 st auxiliary channel includes a 1 st high pass filter, a 1 st phase shifter, a 1 st power regulator, and a 1 st switch, the 2 nd auxiliary channel includes a 2 nd high pass filter, a 2 nd phase shifter, a 2 nd power regulator, and a 2 nd switch, the 3 rd auxiliary channel includes a 3 rd high pass filter, a 3 rd phase shifter, a 3 rd power regulator, and a 3 rd switch, and the 4 th auxiliary channel includes a 4 th high pass filter, a 4 th phase shifter, a 4 th power regulator, and a 4 th switch. The 1 st calibration channel includes a 5 th high pass filter, the 2 nd calibration channel includes a 6 th high pass filter, the 3 rd calibration channel includes a 7 th high pass filter, and the 4 th calibration channel includes an 8 th high pass filter.

The low-frequency cut-off frequencies of the 1 st to 4 th high-pass filters are respectively 2GHz, 3GHz, 4GHz and 5 GHz. The low-frequency cut-off frequencies of the 5 th to 8 th high-pass filters of the corresponding calibration circuits are respectively 2GHz, 3GHz, 4GHz and 5 GHz.

First, the signal output from the final amplifier is considered to have the form s1 (t). Since the harmonics of the power amplifier do not affect the lower harmonics and the harmonics of the lower harmonics may affect the higher harmonics, it is necessary to cancel the harmonics in order from the lower harmonics to the higher harmonics.

And connecting the radio frequency output end with the input end of the attenuator, and connecting the output end of the second one-to-five switch with the ATE radio frequency receiver to perform harmonic elimination calibration operation. The calibration operation comprises the following steps:

s201, a radio frequency signal receiving and transmitting processing device transmits a main signal, the frequency f of the main signal is 1GHz, the radio frequency output power requirement is P, a first one-to-five switch and a second one-to-five switch in a calibration circuit are respectively conducted with a through path through a calibration control port of the radio frequency signal receiving and transmitting processing device, the main signal is transmitted to an ATE radio frequency receiver through the through path of a transmitting channel and the calibration circuit in sequence, the transmitting signal power of an ATE radio frequency signal source is adjusted, the receiving signal power monitored by the ATE radio frequency receiver meets the radio frequency output power requirement, at the moment, the transmitting power is P0, the requirement for meeting the radio frequency output power refers to the radio frequency output power P = the receiving power plus the loss of the calibration circuit, and the receiving power ATE refers to the power of a signal received by the radio frequency receiver.

S202, after a signal enters an auxiliary circuit through a first broadband power divider, the signal is firstly matched with a harmonic generation circuit through a matching circuit, then the signal enters a harmonic generation circuit, the purpose of the signal is to generate each order of harmonic of a main signal, and the signal form after the signal passes through a harmonic generator is as follows:

；

where the ellipses are each higher order harmonic component,a1，b1，c1，d1... are the amplitudes of the harmonics of each order,

respectively, the phase of each order harmonic generated by the harmonic generator.

S203, first, the second harmonic is processed, that is, the second harmonic term in the S1 (t) signal is eliminated:

the method is to analyze the corresponding auxiliary channel, and the calibration circuit also selects the corresponding channel to operate, so as to generate the second harmonic term of the harmonic signal in step S202

So as to produce

And

offsetting, specifically, gating the 1 st auxiliary channel and the 1 st calibration channel, and acquiring the phase of the 1 st phase shifter required for offsetting the second harmonic under the frequency f and the radio frequency output power P

Then, the phase at the 1 st phase shifter is obtained as

Power of the 1 st power regulator required for time-cancelling the second harmonic

Obtaining the calibration parameters required for second harmonic elimination as

. Specifically, the method comprises steps S2031 to S2033.

S2031, according to the result of the step S101, the transmitting signal frequency f and the transmitting power P0 of the ATE radio frequency signal source are not changed, the radio frequency signal receiving and transmitting processing equipment controls the 1 st switch to be closed through the transmitting control port, controls the first one-to-five switch and the second one-to-five switch to be respectively communicated with the 5 th high pass filter through the calibration circuit control port, namely, the 1 st auxiliary channel and the 1 st calibration channel are gated, and the ATE radio frequency receiver acquires the power of the received signal and records the power as the second harmonic power.

S2032, controlling the phase of the 1 st phase shifter in the 1 st auxiliary channel in the auxiliary circuit, stepping the phase of each pair of 1 st phase shifters, monitoring the second harmonic power by the ATE radio frequency receiver for the first time, testing the phase at 360 degrees in total, and forming a corresponding table of the phase and the second harmonic power. Finding out the phase and the second harmonic power when the second harmonic power is minimum from the corresponding table of the phase and the second harmonic power, wherein the phase is the phase for counteracting the second harmonic required under the frequency f and the radio frequency output power P and is recorded as the phase

。

S2033, based on the result of S2032, controlling the phase of the 1 st auxiliary channel to make the phase of the 1 st phase shifter be equal

The radio frequency signal receiving and transmitting processing equipment controls the power of the 1 st power regulator in the auxiliary circuit, so that the second harmonic power is minimum. The specific operation comprises the following steps:

firstly, the power of a 1 st power regulator is reduced, and an ATE radio frequency receiver monitors the change of the power of the second harmonic wave; two cases are included, the first case: if the second harmonic power is smaller, continuing to reduce the power of the 1 st power regulator until the second harmonic power is larger when readjusting again, and when the second harmonic power is minimum, recording the power of the 1 st power regulator as p11, as shown in fig. 3; in the second case: if the second harmonic power is increased, the power of the 1 st power regulator is adjusted to be increased, and the second harmonic power is decreased, and until the second harmonic power is increased when the second harmonic power is adjusted again, the power of the 1 st power regulator is expressed as p12, as shown in fig. 4, when the second harmonic power is minimum. At this time, the second harmonic elimination calibration is completed, and the calibration parameters required by the second harmonic elimination are

Wherein

Is p11Or p 12.

Since the second-order high-pass filter passes higher harmonics, such as the third order and the fourth order, the second harmonic is processed while the third and higher harmonics output from the final amplifier are vector-added, for example, the third harmonic signal is the signal s1 (t)

The third harmonic generated by the 1 st auxiliary channel of the auxiliary circuit and the amplifiers of each stage is

Then the vector sum of the two signals is the amplitude and phase of the output third order signal, which is recorded as:

the same holds for higher orders of the fourth order, i.e.

. The third and higher harmonics of the final amplifier output after calibration in this step are in the form of third and higher harmonics

。

S204, eliminating a third harmonic term in the S18 (t) signal in the step S203:

. The method adopted is to analyze the corresponding auxiliary channel, and the calibration circuit also selects the corresponding channel to operate, so as to generate the third harmonic term in step S202

So that the third harmonic term is generated

And

offsetting, specifically, gating the 2 nd auxiliary channel and the 2 nd calibration channel, and acquiring the phase of the 2 nd phase shifter required for offsetting the third harmonic under the frequency f and the radio frequency output power P

Then, the phase at the 2 nd phase shifter is obtained as

Power of the 2 nd power regulator needed to time cancel the third harmonic

The calibration parameters required for obtaining the third harmonic elimination are

. Specifically, steps S2041-S2043 are included.

S2041, the transmitting signal frequency f and the transmitting power P0 of the ATE radio-frequency signal source are not changed, the radio-frequency signal receiving and transmitting processing equipment controls the switch 2 to be closed through the transmitting control port (at the moment, the switch 1 is still in a closed state), the calibration circuit controls the port to control the first one-to-five switch and the second one-to-five switch to be respectively communicated with the high-pass filter 6, namely, the auxiliary channel 2 and the calibration channel 2 are gated, and the ATE radio-frequency receiver obtains the power of the received signal and records the power as third harmonic power.

S2042, the radio frequency signal receiving and transmitting processing equipment controls the phase of the 2 nd phase shifter in the auxiliary circuit, the phase of each pair of the 2 nd phase shifters is stepped once, the ATE radio frequency receiver monitors the third harmonic power once, 360-degree phase testing is carried out totally, and a corresponding table for controlling the phase and the third harmonic power is formed. Finding out the phase and the third harmonic power when the third harmonic power is minimum from the corresponding table of the phase and the third harmonic power, wherein the phase is the phase for counteracting the third harmonic required under the frequency f and the radio frequency output power P and is recorded as the phase

。

S2043, controlling the phase of the 2 nd auxiliary channel according to the result of S2042 to make the phase of the 2 nd phase shifter be

The radio frequency signal transceiving processing device minimizes the third harmonic power by controlling the power of the 2 nd power regulator in the auxiliary circuit. The specific operation comprises the following steps:

firstly, the power of a 2 nd power regulator is reduced, and an ATE radio frequency receiver monitors the change of the third harmonic power; two cases are included, the first case: if the third harmonic power is reduced, continuing to reduce the power of the 2 nd power regulator until the third harmonic power is increased when the third harmonic power is adjusted again, and recording the power of the 2 nd power regulator as p21 when the third harmonic power is minimum; in the second case: when the third harmonic power is increased, the power of the 2 nd power regulator is increased, the third harmonic power is decreased, and when the third harmonic power is increased until the power of the 2 nd power regulator circuit is adjusted again, the third harmonic power is decreased, and the third harmonic power is minimized, the power of the 2 nd power regulator is denoted as power p 22. Then the third harmonic cancellation calibration is completed and the calibration parameters required for the third harmonic cancellation are

Wherein

Is p21 or p 22.

When eliminating the third harmonic, the fourth harmonic and the higher harmonics are added, that is, after the calibration in this step, the expression form of the fourth and the higher harmonics is:

。

s205, eliminating the fourth harmonic term in the S28 (t) signal in the step S204:

. The method adopted is to analyze the corresponding auxiliary channel, and the calibration circuit also selects the corresponding channel to operate, so as to generate the fourth harmonic term of the harmonic signal in step S202

So as to produce

And

counteracting; specifically, the 3 rd auxiliary channel and the 3 rd calibration channel are gated and gated, and the phase of the 3 rd phase shifter required for counteracting the fourth harmonic under the frequency f and the radio frequency output power P is obtained firstly

Then, the phase at the 3 rd phase shifter is obtained as

Power of 3 rd power regulator needed for time-cancelling fourth harmonic

The calibration parameter required for obtaining the fourth harmonic elimination is

. Specifically, steps S2051-S2053 are included.

S2051, without changing the frequency f and the transmission power P0 of the transmitting signal of the ATE radio-frequency signal source, the radio-frequency signal transceiving processing device controls the 3 rd switch to be closed through the transmitting control port (at this time, the 1 st switch and the 2 nd switch are still in a closed state), controls the first one-to-five switch and the second one-to-five switch to be respectively communicated with the 7 th high-pass filter through the calibration circuit control port, namely, the 3 rd auxiliary channel and the 3 rd calibration channel are gated, and the ATE radio-frequency receiver acquires the power of the received signal and records the power as fourth harmonic power.

S2052, radio frequency communicationThe signal receiving and transmitting processing equipment controls the phase of a 3 rd phase shifter in the auxiliary circuit, the phase of each pair of the 3 rd phase shifters is stepped once, the ATE radio frequency receiver monitors the fourth harmonic power once, 360-degree phase testing is carried out totally, and a corresponding table for controlling the phase and the fourth harmonic power is formed. Finding out the phase and the fourth harmonic power when the fourth harmonic power is minimum from the corresponding table of the phase and the fourth harmonic power, wherein the phase is the phase for counteracting the fourth harmonic required under the frequency f and the radio frequency output power P and is recorded as the phase

。

S2053, controlling the phase of the 3 rd auxiliary channel according to the result of S2052 to make the phase of the 3 rd phase shifter be

The radio frequency signal transceiving processing device minimizes the fourth harmonic power by controlling the power of the 3 rd power regulator in the auxiliary circuit. The specific operation comprises the following steps:

the power of the 3 rd power regulator is firstly adjusted to be small, and the ATE radio frequency receiver monitors the change of the power of the fourth harmonic wave: two cases are included, the first case: if the fourth harmonic power is smaller, continuing to reduce the power of the 3 rd power regulator until the fourth harmonic power is larger when the fourth harmonic power is adjusted again, and recording the power of the 3 rd power regulator as p31 when the fourth harmonic power is minimum; in the second case: if the fourth harmonic power is increased, the power of the 3 rd power regulator is increased, the fourth harmonic power is decreased, and if the fourth harmonic power is increased until the power of the 3 rd power regulator circuit is adjusted again, the power of the 3 rd power regulator is minimized, and the power of the 3 rd power regulator is designated as power p 32. Then the fourth harmonic cancellation calibration is completed, and the calibration parameters required for the fourth harmonic cancellation are (a)

，

) Wherein

Is p31 or p 32.

When the fourth harmonic is eliminated, the fifth harmonic and the higher harmonics are added in a vector mode, namely after the calibration of the step, the fifth harmonic and the higher harmonics have the expression form:

。

s206, eliminating a fifth harmonic term in the S38 (t) signal in the step S205:

. The method adopted is to analyze the corresponding auxiliary channel, and the calibration circuit also selects the corresponding channel to operate, so as to generate the fifth harmonic term of the harmonic signal in step S202

So as to produce

And

offsetting, specifically, gating the 4 th auxiliary channel and the 4 th calibration channel, and obtaining the phase of the 4 th phase shifter required for offsetting the fifth harmonic under the frequency f and the radio frequency output power P

Then, the phase at the 3 rd phase shifter is obtained as

Power of 3 rd power regulator needed for time-cancelling fifth harmonic

The calibration parameter required for obtaining the fifth harmonic elimination is

. Specifically, the method comprises steps S2061 to S2063.

S2061, without changing the transmitting signal frequency f and the transmitting power P0 of the ATE radio-frequency signal source, the radio-frequency signal transceiving processing equipment controls the 4 th switch to be closed through the transmitting control port (at this time, the 1 st switch, the 2 nd switch and the 3 rd switch are still in a closed state), controls the first one-to-five switch and the second one-to-five switch to be respectively communicated with the 8 th high-pass filter through the calibration circuit control port, namely, the 4 th auxiliary channel and the 4 th calibration channel are gated, and the ATE radio-frequency receiver acquires the power of the received signal and records the power as fifth harmonic power.

S2062, the radio frequency signal receiving and transmitting processing equipment controls the phase of the 4 th phase shifter in the auxiliary circuit, the phase of each pair of 4 th phase shifters is stepped once, the ATE radio frequency receiver monitors the fifth harmonic power once, and 360-degree phase test is carried out in total to form a corresponding table for controlling the phase and the fifth harmonic power. Finding out the phase and the fifth harmonic power when the fifth harmonic power is minimum from the corresponding table of the phase and the fifth harmonic power, wherein the phase is the phase for counteracting the fifth harmonic required under the frequency f and the radio frequency output power P and is marked as the phase

。

S2063, based on the result of S2062, controlling the phase of the 4 th auxiliary channel to make the phase of the 4 th phase shifter be

The RF signal transceiving processing device minimizes the fifth harmonic power by controlling the power of the 4 th power regulator in the auxiliary circuit. The specific operation comprises the following steps:

firstly, the power of a 4 th power regulator is reduced, and an ATE radio frequency receiver monitors the change of the fifth harmonic power: two cases are included, the first case: if the fifth harmonic power is reduced, the power of the 4 th power regulator is continuously reduced until the fifth harmonic power is increased when the power is adjusted againWhen the fifth harmonic power is minimum, the power of the 4 th power regulator is recorded as p 41; in the second case: when the power of the 4 th power regulator is adjusted to be high and the power of the fifth harmonic is decreased when the power of the 4 th power regulator is adjusted to be high again, the power of the 4 th power regulator is set to be power p42 when the power of the fifth harmonic is increased and the power of the fifth harmonic is decreased to be minimum when the power of the fifth harmonic is increased again. Then the fifth harmonic cancellation calibration is complete and the calibration parameters required for the fifth harmonic cancellation are

Wherein

Is p41 or p 42.

When the fifth harmonic is eliminated, the sixth harmonic and higher harmonics are added in a vector mode, and the sixth harmonic 6GHz is not within the bandwidth range of 1-5.8GHz, so that the sixth harmonic can be filtered by the second low-pass filter and the first low-pass filter.

S207, completing the whole calibration process under the frequency f and the radio frequency output power P, and setting the calibration parameters as

，

，

，

Respectively to registers Reg1, Reg2, Reg3, Reg 4. And establishing and storing a corresponding relation table of the frequency f, the radio frequency output power P, the transmission power P0, the Reg1, the Reg2, the Reg3 and the Reg 4.

When a signal with the frequency f and the radio frequency output power P is required to be adopted, the corresponding P0 and the registers Reg1, Reg2, Reg3 and Reg4 are searched through the corresponding relation table, the transmitting power of the ATE radio frequency signal source is set to be P0, the frequency is set to be f,the calibration parameters of Reg1, Reg2, Reg3 and Reg4 are called to respectively adjust the 1 st phase shifter to the 4 th phase shifter as follows:

、

、

、

the 1 st power regulator and the 4 th power regulator are respectively regulated to

、

、

、

And gating the 1 st-4 th auxiliary channel, dividing a main signal output by the ATE radio frequency signal source into two paths, wherein one path generates a second harmonic term, a third harmonic term, a fourth harmonic term and a fifth harmonic term through the 1 st-4 th auxiliary channel of the auxiliary circuit, and then is converged with the other path of signal to pass through a signal with the transmission channel output frequency f and the radio frequency output power P, and eliminates harmonic waves generated by an amplifier of the transmission channel. By adopting the calibration method, the harmonic suppression function can be quickly called and realized by only once calibration without the need of designing a segmented high-power filter, switching the filter or independently debugging the filters with different frequencies, and the method can be applied to eliminating the harmonic generated by the radio frequency power amplifier in a full frequency band and can improve the production efficiency in an automatic test.

One of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.

While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the foregoing and various other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention.

Claims

1. A calibration system for harmonic cancellation in a wideband radio frequency power amplifier, comprising: the device comprises radio frequency signal receiving and transmitting processing equipment, a transmitting channel, an auxiliary circuit and a calibration circuit;

the auxiliary circuit further comprises a matching circuit, a harmonic generator and a second broadband power divider, wherein the input end of the matching circuit is the input end of the auxiliary circuit and is connected with the output end of the first broadband power divider, the output end of the matching circuit is sequentially connected with the harmonic generation circuit and the second broadband power divider, the second broadband power divider is provided with M output ends which are respectively connected with the input end of each auxiliary channel, and the output end of each auxiliary channel is respectively connected with the other M input ends of the broadband power combiner;

calibration circuit's input is connected with the radio frequency output of transmission channel, and ATE radio frequency receiver is connected to calibration circuit's output, and calibration circuit includes: the calibration circuit comprises an attenuator, a first one-to-N switch, N feedback channels and a second one-to-N switch, wherein N = M +1, the input end of the attenuator is connected with the radio-frequency output end of a transmitting channel, the output end of the attenuator is connected with the input end of one of the N feedback channels through the first one-to-N switch, the output end of one of the N feedback channels is connected with an ATE radio-frequency receiver through the second one-to-N switch, and the radio-frequency signal transceiving processing equipment controls the first one-to-N switch and the second one-to-N switch through a calibration control port to control the state of the feedback channel of the calibration circuit;

the radio frequency signal receiving and transmitting processing equipment is connected with the calibration circuit through the calibration control port and is used for controlling the state of the calibration circuit;

wherein the N feedback channels comprise a through path and M calibration channels, the low-frequency cut-off frequency of the jth auxiliary channel is equal to that of the jth calibration channel,

。

2. the calibration system according to claim 1, wherein the ith auxiliary channel comprises an ith high-pass filter, an ith phase shifter, an ith power adjuster and an ith switch which are connected in sequence, the ith high-pass filter is connected with the output end of the second wideband power divider, one input end of the M other input ends of the wideband power combiner is connected with the ith switch, the radio frequency signal transceiving processing device controls the ith switch to be closed or opened through the transmission control port, and controls the parameters of the ith phase shifter and the ith power adjuster when the ith switch is closed to realize the control of the state of the ith auxiliary channel,

。

3. the calibration system of claim 2, wherein the M calibration channels each comprise a high pass filter, the high pass filter of the jth calibration channel is denoted as an M + j high pass filter, and wherein the pass-through path is that the output of the attenuator is connected to the second divide-by-N switch through the first divide-by-N switch, and the M + j high pass filter is the same as the jth high pass filter.

4. A calibration method for harmonic cancellation in a wideband radio frequency power amplifier, comprising:

s102, setting t =2, wherein t represents t harmonic;

s103, judging whether tf is satisfied

Wherein the auxiliary circuit comprises M auxiliary channels,

s104, gating the jth auxiliary channel and the jth calibration channel of the calibration circuit, wherein the main signal is divided into two paths, one path is output to the input end of the transmitting channel, the other path is output to the jth auxiliary channel, a signal output by the jth auxiliary channel is combined with a signal received by the input end of the transmitting channel, the combined signal is sequentially sent to the ATE radio frequency receiver through the transmitting channel and the jth calibration channel, the phase shifter of the jth auxiliary channel is subjected to phase adjustment, the power of the signal received by the ATE radio frequency receiver through the jth calibration channel is minimum, and the phase of the phase shifter of the jth auxiliary channel is recorded as

Wherein the low frequency cut-off frequency of the jth auxiliary channel and the jth calibration channel are equal;

For the jth auxiliary channelThe power regulator of (a) performs power regulation so that the power of a signal received by the ATE radio frequency receiver through the jth calibration channel is minimum, and the power of the power regulator of the jth auxiliary channel is recorded as

Then, then

Calibration parameters for eliminating the t-th harmonic;

s106, t = t +1, go to step S103;

5. The calibration method of claim 4, wherein determining the RF output power from a signal received by an ATE RF receiver comprises: rf output power P = received power + loss of calibration circuit, where received power refers to the power of the signal received by the ATE rf receiver.

6. The calibration method according to claim 4, wherein the method further comprises: before step S101, determining the number M of auxiliary channels, M = int ((fh-fl)/fl), fl being the lowest frequency of the bandwidth of the emission channel, fh being the highest frequency of the bandwidth of the emission channel, and int ((fh-fl)/fl) indicating that the calculation result of (fh-fl)/fl is rounded.

7. The calibration method according to claim 6, wherein the method further comprises: determining truncation of the high-pass filter for each auxiliary channel prior to step S101Stop frequency:

。