CN112564628A - Modulator with wide frequency band and high intrinsic vibration suppression degree - Google Patents

Modulator with wide frequency band and high intrinsic vibration suppression degree Download PDF

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CN112564628A
CN112564628A CN202011442258.9A CN202011442258A CN112564628A CN 112564628 A CN112564628 A CN 112564628A CN 202011442258 A CN202011442258 A CN 202011442258A CN 112564628 A CN112564628 A CN 112564628A
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local oscillator
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modulation
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CN112564628B (en
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陈鹏
田玲
范秋
张雷
余旭涛
严旻宇
王小康
杨晨
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Zijinshan Laboratory
Southeast University
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Network Communication and Security Zijinshan Laboratory
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/16—Multiple-frequency-changing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

本发明公开了一种宽频带高本振抑制度的调制器，该调制器包括：调制信号产生模块、本振信号产生模块、MCU、本振抑制校准模块和调制输出模块；调制信号产生模块包括顺序串联连接的中频信号输入模块和I、Q混频器1；本振信号产生模块包括顺序串联连接的宽带频率合成器、功放&衰减模块1、功分模块，本振抑制校准模块包括顺序串联连接的负压模块、I、Q混频器2和幅度调整模块，调制输出模块包括顺序串联连接的合路器和功放&衰减模块2；调制信号产生模块中输出的宽带调制信号和本振抑制校准模块中的反相本振作为合路器的输入端。该调制器用于宽带发射机及宽带高性能仪表中，具有宽频带、高本振抑制度的特点。

Figure 202011442258

The invention discloses a wide-band and high local oscillation suppression modulator. The modulator includes: a modulation signal generation module, a local oscillation signal generation module, an MCU, a local oscillation suppression calibration module and a modulation output module; the modulation signal generation module includes a serially connected The connected intermediate frequency signal input module and I, Q mixer 1; the local oscillator signal generation module includes a broadband frequency synthesizer, a power amplifier & attenuation module 1, a power division module connected in series in sequence, and the local oscillator suppression calibration module includes serially connected in sequence. Negative pressure module, I, Q mixer 2 and amplitude adjustment module, the modulation output module includes a combiner connected in series and a power amplifier & attenuation module 2; the wideband modulation signal output from the modulation signal generation module and the local oscillator suppression calibration module The inverting local oscillator in is used as the input of the combiner. The modulator is used in broadband transmitters and broadband high-performance instruments, and has the characteristics of wide frequency band and high local oscillation suppression.

Figure 202011442258

Description

Modulator with wide frequency band and high intrinsic vibration suppression degree
Technical Field
The invention belongs to the technical field of microwave/millimeter wave devices, relates to a broadband test instrument, and particularly relates to a broadband direct modulator with high local vibration suppression degree.
Background
With the rapid development of electronic and communication systems, especially the popularization of 5G, the demand for wireless communication test instruments is also increasing. Common wireless communication broadband test instruments include network analyzers, frequency spectrometers, frequency scanners, signal sources and the like. These test instruments have been technically monopolized by western countries, and the development of domestic test instruments is relatively slow and lagged behind. The modulator is used as an important component of a wireless communication test instrument, and the bandwidth, the noise performance, the local oscillation suppression degree and the sideband suppression degree of the modulator directly influence the performance of the wireless test instrument. It becomes crucial to propose a design method of a high-performance modulator.
The direct modulator has the characteristics of simple structure, less combined frequency interference and easy integration, and is widely adopted in the design of a broadband test instrument all the time. Since the direct modulation has the serious defects of local oscillator leakage and I, Q mismatch, the modulation bandwidth and the output frequency range of the current commercial direct modulator are narrow, and therefore, a method for providing a high-performance broadband direct modulator with a wide modulation bandwidth becomes important.
The invention provides a design method of a modulator with wide frequency band and high local oscillation suppression degree, which replaces the modulator in a wireless test instrument and has the advantages of low phase noise, high local oscillation suppression degree and high sideband balance degree.
Disclosure of Invention
The technical problem is as follows: as an important part in a wireless communication test instrument, the invention provides a realization method and an experimental device of a modulator with a wide frequency band and a high local vibration suppression degree, which can design the modulator with low phase noise, wide frequency band, high local vibration suppression degree and high sideband balance degree performance, effectively reduce the cost of the test instrument and improve the test precision of the test instrument.
The technical scheme is as follows: the invention provides a modulator with wide frequency band and high local vibration suppression degree, comprising: the device comprises a modulation signal generation module, a local oscillator signal generation module, an MCU, a local oscillator suppression calibration module and a modulation output module;
the modulation signal generation module comprises an intermediate frequency signal input module and an I, Q mixer 1 which are sequentially connected in series, and the module generates a broadband modulation signal;
the local oscillator signal generating module comprises a broadband frequency synthesizer, a power amplifier and attenuation module 1 and a power division module which are sequentially connected in series, and the module generates a local oscillator 1 signal required by the modulating signal generating module and a local oscillator 2 signal required by the suppression calibration module
The local oscillation suppression calibration module comprises a negative pressure module, an I, Q frequency mixer 2 and an amplitude adjustment module which are sequentially connected in series, and the module generates an opposite phase local oscillation signal;
the modulation output module comprises a combiner and a power amplifier and attenuation module 2 which are sequentially connected in series; the broadband modulation signal output by the modulation signal generation module and the reverse local oscillator in the local oscillator suppression calibration module are used as the input end of the combiner.
The method comprises the steps that a broadband modulation signal output by a modulation signal generation module and an opposite-phase local oscillator output by a local oscillator suppression calibration module are synthesized to suppress a local oscillator signal of the modulation signal, and the specific realization method comprises the steps that I, Q frequency mixer 1 in the modulation signal generation module is utilized to mix frequency of the local oscillator 1 generated in the local oscillator signal generation module with an intermediate frequency I, Q signal to obtain the broadband modulation signal, the local oscillator suppression calibration module generates a signal opposite to the local oscillator in the modulation signal generation module, and the amplitude of the opposite-phase local oscillator signal is adjusted by an amplitude adjustment module to obtain the local oscillator opposite-phase signal with ideal power; the two paths of output signals are combined by the microstrip power synthesizer to inhibit local oscillation components in the modulation signals, and finally the modulator for outputting the broadband high local oscillation inhibition degree is realized.
In the modulation signal generation module, a local oscillator 1 generated in the local oscillator signal generation module and an orthogonal intermediate frequency signal in the intermediate frequency signal input module are subjected to frequency mixing by an I, Q frequency mixer 1 to obtain a broadband modulation signal; a negative pressure module in the local oscillator suppression calibration module generates an adjustable negative pressure value as an intermediate frequency input signal of the I, Q mixer 2, the negative pressure signal is mixed with the local oscillator 2 in the local oscillator signal generation module to obtain an opposite-phase local oscillator signal, and the amplitude of the opposite-phase local oscillator is adjusted and an opposite-phase local oscillator is output through an amplitude adjustment module in the local oscillator suppression calibration module; the two paths of output signals are output by combining through a broadband combiner in a modulation output module, and modulation signals with adjustable amplitude and broadband high local oscillation suppression degree are obtained through a power amplifier and attenuation module 2; the bandwidth range of the modulation signal is DC-5 GHz; the intermediate frequency signal input range of the modulation signal generation module is DC-5 GHz, namely the modulation signal range is DC-5 GHz; the modulation signal and the local oscillation signal are subjected to frequency mixing by I, Q, and are combined with the local oscillation suppression calibration module by the modulation signal generation module to output a broadband modulation signal, wherein the frequency range of the signal is 6 GHz-28 GHz.
The negative pressure module in the local oscillation suppression calibration module consists of a high-digit precise DAC circuit and an operational amplifier circuit; the DAC circuit generates low-noise direct-current voltage with accurately adjustable size, and negative direct-current voltage is generated through the operational amplifier inverter circuit and is used as an I, Q mixer 2 intermediate-frequency input signal in the local oscillation suppression calibration module, so that 180-degree accurate phase shift of a broadband is realized; the I, Q mixer 2 is loaded into the I, Q mixer 2 by negative dc voltage to generate a local oscillator calibration signal 180 degrees out of phase with the local oscillator signal in the modulation signal generation module.
The power amplifier and attenuation module 1 and the power amplifier and attenuation module 2 both comprise a broadband step attenuator and a power amplifier, and the working frequency range is 6 GHz-28 GHz. The circuit form of the power amplifier and attenuation module 1 in the local oscillation signal generation module and the power amplifier and attenuation module 2 in the modulation output module is the same; the local oscillator signal is adjusted to the desired power through a power amplifier and attenuation module 1, the specific implementation method is that the local oscillator signal is amplified through a broadband power amplifier, the power is adjusted to the optimal loop through a controllable step attenuator, and finally the output signal of the local oscillator suppression calibration module is used as a path of combined signal; in order to keep the input and output ends dynamically balanced, a numerical control attenuator 1 and a numerical control attenuator 2 are respectively arranged at the front end and the rear end of the power amplifier.
The power division module in the local oscillation signal generation module is general to the combiner in the modulation output module; a six-order Wilkinson structure is adopted, the working frequency range is 5 GHz-30 GHz, and the isolation is high; after a local oscillation signal with the frequency range of 6-28 GHz passes through the power & attenuation module 1, two paths of signals with equal power and same phase, namely the local oscillation 1 and the local oscillation 2, are generated through the power division module and are respectively used as local oscillation signals of the local oscillation suppression calibration module and the modulation signal generation module; combining the broadband modulation signal generated by the modulation signal generation module with two paths of signals of the opposite-phase local oscillator generated by the local oscillator suppression calibration module through a combiner to generate a final radio frequency output signal of the system; the amplitude balance, the phase balance and the isolation of the power dividing module and the combiner affect the local oscillation suppression performance of the synthesized radio frequency signal.
The negative pressure module in the local oscillation suppression calibration module is composed of a control circuit of a DAC and an operational amplifier circuit, namely the negative pressure module mainly comprises an LDO _ I, LDO _ Q, DAC _ I, DAC _ Q, an operational amplifier I and an operational amplifier Q; the negative voltage module provides a negative direct current voltage which is low in noise and accurate and controllable in magnitude for the local oscillator suppression calibration module to serve as an intermediate frequency input signal, and negative voltage and the local oscillator signal are mixed to obtain an opposite phase local oscillator signal; the working method of the negative pressure module is that the LDO generates low-noise stable voltage as the supply voltage of the DAC, the SPI signal generated by the MCU is used as the input signal of the DAC to control the DAC to output accurate analog voltage, the output voltage of the DAC is used as the input signal of the inverting operational amplifier circuit, and finally the negative pressure output by the operational amplifier circuit is used as the intermediate frequency input signal of the local oscillation suppression calibration module.
The power amplifier and attenuation module 1 in the local oscillation signal generation module mainly comprises a numerical control attenuator and an amplifier, and the variable gain function is realized; the amplitude adjusting module has the functions of carrying out controllable attenuation output on the received reverse local oscillator input signal, changing an attenuation value through inputting a control word, observing the output performance of the system, determining an attenuation optimal value at a specific frequency point, and taking the output reverse local oscillator of the amplitude adjusting module as a path of combined signals.
An intermediate frequency signal input module in the modulation signal generation module mainly comprises an intermediate frequency automatic gain control circuit, and the working frequency range is DC-5 GHz; the intermediate frequency signal input module is used for providing a modulation signal for the modulation signal generation module, the signals from the baseband I and the baseband Q are respectively amplified and output through the intermediate frequency automatic gain control circuit, the amplitude of the output I, Q signal is adjustable, and the local oscillation signal output by the I, Q frequency mixer can be further inhibited.
The MCU sends out a control signal to control the numerical control attenuators in the power amplifier and attenuation modules 1 and 2, and the power is adjusted to the optimal value of the modules; the MCU sends out an SPI signal to control the high-precision DAC _ I and DAC _ Q in the negative pressure module, and the size of the reverse local oscillation signal is adjusted by accurately adjusting the size of the negative pressure. The power output of the local oscillation signal generation module, the local oscillation suppression calibration module and the modulation output module is accurately adjustable through the control of the MCU, and then the modulator with wide frequency band and high local oscillation suppression degree is realized.
Has the advantages that: the implementation method provided by the modulator with the broadband and the high intrinsic vibration suppression degree can be used for point-to-point microwave radio radars, broadband system instruments and meters and automatic test equipment. The output frequency range of the experimental device of the modulator with the broadband high local oscillation suppression degree is 5 GHz-28 GHz, the experimental device can cover the millimeter wave frequency band of a fifth generation mobile communication system, the proposed experimental method can be theoretically expanded to any frequency band, and the experimental device can be used as a design method of the modulator applied to a 6G mobile communication system.
Drawings
Fig. 1 is a block diagram of an implementation of a wide-band high-intrinsic-suppression modulator.
Fig. 2 is an experimental apparatus of a wide-band high-intrinsic-vibration-suppression modulator.
Detailed description of the invention
The invention provides a method for realizing a modulator with high local vibration suppression degree of a frequency band, which adopts the following main technical scheme:
1) the modulator includes: the device comprises a modulation signal generation module, a local oscillator suppression calibration module, a modulation output module and an MCU (microprogrammed control unit); the modulation signal generation module comprises an intermediate frequency signal input module and an I, Q mixer 1 which are sequentially connected in series, and the module generates a broadband modulation signal; the local oscillation signal generating module comprises a broadband frequency synthesizer, a power amplifier and attenuation module 1 and a power division module which are sequentially connected in series, and the module generates a local oscillation 1 required by the modulating signal generating module and a local oscillation 2 required by the local oscillation suppression calibration module; the local oscillation suppression calibration module comprises a negative pressure module, an I, Q frequency mixer 2 and an amplitude adjustment module which are sequentially connected in series, and the module generates an opposite phase local oscillation signal; the modulation output module comprises a combiner and a power amplifier and attenuation module 2 which are sequentially connected in series; the broadband modulation signal output by the modulation signal generation module and the reverse local oscillator in the local oscillator suppression calibration module are used as the input end of the combiner.
2) The method is suitable for realizing the broadband modulator in any frequency band. The specific implementation method is that I, Q mixer 1 in the modulation signal generation module is used to mix the local oscillator 1 generated in the local oscillator signal generation module with the intermediate frequency signal to obtain the broadband modulation signal. The signal has leaked local oscillation signal, so that the requirement of high-performance broadband modulation signal is not met. The local oscillator inhibition calibration module generates a signal in phase opposite to the local oscillator in the modulation signal generation module, and the amplitude of the phase opposite local oscillator signal is adjusted by the amplitude adjustment module to obtain a local oscillator phase opposite signal with ideal power. The two paths of output signals are combined by the microstrip power synthesizer to inhibit local oscillation components in the modulation signals, and finally the modulator for outputting the broadband high local oscillation inhibition degree is realized.
3) In a modulation signal generation module, a local oscillator 1 generated in the local oscillator signal generation module and an orthogonal intermediate frequency signal in an intermediate frequency signal input module are subjected to frequency mixing by an I, Q frequency mixer 1 to obtain a broadband modulation signal; the negative pressure module in the local oscillation suppression calibration module generates an adjustable negative pressure value as an intermediate frequency input signal of the I, Q mixer 2, the negative pressure signal is mixed with the local oscillation 2 in the local oscillation signal generation module to obtain an opposite-phase local oscillation signal, and the amplitude of the opposite-phase local oscillation is adjusted and the opposite-phase local oscillation is output through the amplitude adjustment module in the local oscillation suppression calibration module. The two paths of output signals are combined and output through a broadband combiner in the modulation output module, and the modulation signals with adjustable amplitude and broadband high local oscillation suppression degree are obtained through a power amplifier and attenuation module 2.
4) The mixer 2 is loaded with a negative dc voltage I, Q to generate a local oscillator calibration signal that is 180 degrees out of phase with the local oscillator signal in the modulated signal generation module. At present, a commercial phase shifter is difficult to realize the precise phase shift of 180 degrees in an ultra-wideband range.
5) The negative pressure module mainly comprises a high-digit precise DAC circuit and an operational amplifier circuit. The DAC circuit generates low-noise direct-current voltage with accurate and adjustable size, and negative direct-current voltage is generated through the operational amplifier phase-inverting circuit and serves as an intermediate-frequency input signal of I, Q frequency mixer 2 in the local oscillation suppression calibration module, so that accurate phase shift of 180 degrees of a broadband is achieved.
6) The bandwidth of the modulated signal ranges from DC to 5 GHz. The intermediate frequency signal input range of the modulation signal generation module is DC-5 GHz, namely the modulation signal range of the experimental device is DC-5 GHz. The modulation signal and the local oscillation signal are subjected to frequency mixing by I, Q, and are combined with the local oscillation suppression calibration module by the modulation signal generation module to output a broadband modulation signal, wherein the frequency range of the signal is 6 GHz-28 GHz.
7) The power amplifier and attenuation modules 1 and 2 both comprise a broadband step attenuator and a power amplifier, and the working frequency range is 6 GHz-28 GHz. The circuit form of the power amplifier and attenuation module 1 in the local oscillation signal generation module and the power amplifier and attenuation module 2 in the modulation output module is the same. The local oscillator signal is adjusted to an ideal power through the power amplifier and attenuation module 1, and the specific implementation method is that the local oscillator signal is amplified through the broadband power amplifier, the power is adjusted to be optimal in a loop through the controllable step attenuator, and finally the output signal of the local oscillator suppression calibration module is used as a path of combined signals. In order to keep the input and output ends dynamically balanced, a numerical control attenuator 1 and a numerical control attenuator 2 are respectively arranged at the front end and the rear end of the power amplifier.
8) And the power division module in the local oscillation signal generation module is general to the combiner in the modulation output module. The six-order Wilkinson structure is adopted, the working frequency range is 5 GHz-30 GHz, and the isolation is high. After a local oscillation signal with a frequency range of 6-28 GHz passes through the power & attenuation module 1, two paths of signals with equal power and same phase, namely the local oscillation 1 and the local oscillation 2, are generated by the power division module and are respectively used as local oscillation signals of the local oscillation suppression calibration module and the modulation signal generation module. The broadband modulation signal generated by the modulation signal generation module and the two paths of signals of the opposite-phase local oscillator generated by the local oscillator suppression calibration module are combined by the combiner to generate a final radio frequency output signal of the system. The amplitude balance, the phase balance and the isolation of the power dividing module and the combiner affect the local oscillation suppression performance of the synthesized radio frequency signal.
9) The negative pressure module in the local oscillation suppression calibration module is composed of a control circuit of a DAC and an operational amplifier circuit, namely the negative pressure module mainly comprises LDO _ I, LDO _ Q, DAC _ I, DAC _ Q, an operational amplifier I and an operational amplifier Q. The negative voltage module has the function of providing low-noise negative direct current voltage with accurate and controllable size as an intermediate frequency input signal for the local oscillation suppression calibration module. The negative pressure and the local oscillation signal are mixed to obtain the reverse local oscillation signal. The working method of the negative pressure module is that the LDO generates low-noise stable voltage as the supply voltage of the DAC, and the SPI signal generated by the MCU is used as the input signal of the DAC to control the DAC to output accurate analog voltage. And the output voltage of the DAC is used as an input signal of the inverting operational amplifier circuit, and finally the negative voltage output by the operational amplifier circuit is used as an intermediate frequency input signal of the local oscillation suppression calibration module. The output performance of the system is determined by the size and the noise performance of the negative pressure, so that the rail-to-rail output and low-noise operational amplifier is adopted, the DAC chip with low noise, high precision and rail-to-rail output is adopted, and the low-noise voltage stabilizing chip is adopted to supply power to the active chip, so that the negative pressure is ensured to have low-noise performance, and the size is accurate and adjustable.
10) The power amplifier and attenuation module 1 in the local oscillation signal generation module mainly comprises a numerical control attenuator and an amplifier, and the variable gain function is realized. The amplitude adjusting module has the function of performing controllable attenuation output on the received reverse local oscillator input signal. And changing the attenuation value by inputting a control word, observing the output performance of the system, and determining the optimal attenuation value at a specific frequency point. And the output reverse-phase local oscillator of the amplitude adjustment module is used as a combined path signal.
11) The intermediate frequency signal input module in the modulation signal generation module mainly comprises an intermediate frequency automatic gain control circuit, and the working frequency range is DC-5 GHz. The function of the intermediate frequency signal input module is to provide a modulation signal for the modulation signal generation module. The signals from the baseband I and the baseband Q are respectively amplified and output by intermediate frequency automatic gain control circuits (IFAGC _ I and IFAGC _ Q), the amplitude of the output I, Q signal is adjustable, and the local oscillation signal output by the I, Q mixer can be further inhibited.
12) The MCU sends out a control signal to control the numerical control attenuators in the power amplifier and attenuation modules 1 and 2, and the power is adjusted to the optimal value of the modules; the MCU sends out an SPI signal to control the high-precision DAC _ I and DAC _ Q in the negative pressure module, and the size of the reverse local oscillation signal is adjusted by accurately adjusting the size of the negative pressure. The power output of the local oscillation signal generation module, the local oscillation suppression calibration module and the modulation output module is accurately adjustable through the control of the MCU, and then the modulator with wide frequency band and high local oscillation suppression degree is realized.
The proposed modulator with high local oscillation suppression degree of frequency band can be used in point-to-point microwave radio radar, wideband system instruments and meters and automatic test equipment. The output frequency range of the experimental device of the modulator with the broadband high local oscillation suppression degree is 5 GHz-28 GHz, the experimental device can cover the millimeter wave frequency band of a fifth generation mobile communication system, the proposed experimental method can be theoretically expanded to any frequency band, and the experimental device can be used as a design method of the modulator applied to a 6G mobile communication system.
A method for realizing a modulator with wide frequency band and high local vibration suppression degree and an experimental device are provided, wherein the modulator comprises: the device comprises a modulation signal generation module, a local oscillator suppression calibration module, a modulation output module and an MCU.
The local oscillation signal generating module comprises a broadband frequency synthesizer, a power amplifier and attenuation module 1 and a power divider with a Wilkinson structure, wherein the power amplifier and attenuation module 1 consists of a numerical control attenuator and a power amplifier; the modulation signal generation module comprises an intermediate frequency signal input module and an I, Q mixer 1, wherein the intermediate frequency signal input module consists of an intermediate frequency variable gain amplifier; the local oscillation suppression calibration module comprises a negative pressure module, an amplitude adjustment module and an I, Q mixer 2, wherein the negative pressure module consists of an LDO (low dropout regulator), a controllable DAC (digital-to-analog converter) circuit and an operational amplifier, and the amplitude adjustment module consists of a numerical control attenuator 3; the modulation output module comprises a broadband combiner with a Wilkinson structure and a power amplifier and attenuation module 2, wherein the power amplifier and attenuation module 2 consists of a numerical control attenuator and a power amplifier.
The local oscillation signal generating module obtains a broadband local oscillation input signal with controllable size and a frequency band range of 6 GHz-28 GHz as an input end of the power divider. The power divider generates two paths of radio frequency signals with equal size and same phase as local oscillation input signals of the I, Q frequency mixer of the local oscillation suppression calibration module and the modulation signal generation module. The modulation signal generating module comprises I, Q mixer 1 and intermediate frequency signal input module. In the intermediate frequency signal input module, the amplitude of the signal is adjusted by an intermediate frequency variable amplifier through an I signal and a Q signal brought by a baseband, a quadrature signal with a frequency range of DC-5 GHz is output, and the quadrature signal is mixed with a local oscillation signal I, Q to obtain a broadband modulation signal. The local oscillation suppression calibration module comprises a negative pressure module, an I, Q frequency mixer 2 and an amplitude adjustment module. The negative voltage module generates low-noise, accurate and adjustable negative direct-current voltage through the controllable DAC module and the operational amplifier circuit with the rail-to-rail output performance. And (3) mixing the negative direct current voltage and the local oscillator signal to obtain an opposite-phase local oscillator signal, and attenuating the local oscillator opposite-phase signal to an ideal amplitude value by the numerical control attenuator. The broadband modulation signal output by the modulation signal generation module and the opposite-phase local oscillator generated by the local oscillator suppression calibration module are output by signal combination, and the local oscillator components of the two paths of signals are suppressed due to opposite phases and similar amplitudes, so that the radio frequency modulation signal with high local oscillator suppression degree is finally obtained.

Claims (10)

1.一种宽频带高本振抑制度的调制器，其特征在于，该调制器包括：调制信号产生模块、本振信号产生模块、MCU、本振抑制校准模块和调制输出模块；1. a wide-band high local oscillator suppression degree modulator, is characterized in that, this modulator comprises: modulation signal generation module, local oscillator signal generation module, MCU, local oscillator suppression calibration module and modulation output module; 所述调制信号产生模块包括顺序串联连接的中频信号输入模块和I、Q混频器1，该模块产生宽带调制信号；The modulated signal generation module includes an intermediate frequency signal input module and I, Q mixers 1 connected in series in sequence, and the module generates a wideband modulation signal; 所述本振信号产生模块包括顺序串联连接的宽带频率合成器、功放&衰减模块1、功分模块，该模块产生供给调制信号产生模块所需的本振1信号和本振抑制校准模块所需的本振2信号；The local oscillator signal generation module includes a broadband frequency synthesizer, a power amplifier & attenuation module 1, and a power division module connected in series in sequence, and the module generates the local oscillator 1 signal required by the modulation signal generation module and the local oscillator suppression calibration module required. The local oscillator 2 signal; 所述本振抑制校准模块包括顺序串联连接的负压模块、I、Q混频器2和幅度调整模块，该模块产生反相本振信号；The local oscillator suppression calibration module includes a negative pressure module, I, Q mixers 2 and an amplitude adjustment module connected in series in sequence, and the module generates an inverse local oscillator signal; 所述调制输出模块包括顺序串联连接的合路器和功放&衰减模块2；所述调制信号产生模块中输出的宽带调制信号和本振抑制校准模块中的反相本振作为合路器的输入端。The modulation output module includes a combiner connected in series and a power amplifier & attenuation module 2; the wideband modulation signal output in the modulation signal generation module and the inverse local oscillator in the local oscillator suppression calibration module are used as the input of the combiner end. 2.根据权利要求1所述的一种宽频带高本振抑制度的调制器，其特征在于，所述调制信号产生模块输出的宽带调制信号与本振抑制校准模块输出的反相本振经合成以抑制调制信号的本振信号，具体实现方法为，利用调制信号产生模块中的I、Q混频器1将本振信号产生模块中产生的本振1与中频I、Q信号混频得到宽带调制信号，本振抑制校准模块产生与调制信号产生模块中本振反相的信号，并经过幅度调整模块对反相本振信号的幅度进行调整，得到理想功率的本振反相信号；将两路输出信号通过微带功率合成器合路以抑制调制信号中的本振分量，最终实现输出宽频带高本振抑制度的调制器。2. The modulator of a wide-band high local oscillation suppression degree according to claim 1, wherein the wideband modulation signal output by the modulation signal generation module and the inverse local oscillator output by the local oscillation suppression calibration module are synthesized to Suppressing the local oscillator signal of the modulated signal, the specific implementation method is as follows: using the I and Q mixers 1 in the modulated signal generation module to mix the local oscillator 1 generated in the local oscillator signal generation module with the intermediate frequency I, Q signals to obtain broadband modulation signal, the local oscillator suppression calibration module generates a signal that is inverse to the local oscillator in the modulation signal generation module, and adjusts the amplitude of the inverted local oscillator signal through the amplitude adjustment module to obtain a local oscillator inverted signal of ideal power; The output signal is combined by a microstrip power combiner to suppress the local oscillator component in the modulated signal, and finally a modulator with a wide frequency band and high local oscillator suppression is realized. 3.根据权利要求1和2所述的一种宽频带高本振抑制度的调制器，其特征在于，所述调制信号产生模块中，来自本振信号产生模块中产生的本振1与中频信号输入模块中的正交中频信号通过I、Q混频器1混频得到宽带调制信号；本振抑制校准模块中的负压模块产生可调的负压值作为I、Q混频器2的中频输入信号，该负压信号与本振信号产生模块中的本振2混频得到反相的本振信号，再经过本振抑制校准模块中的幅度调整模块对反相本振的幅度进行调整并输出反相本振；两路输出信号通过调制输出模块中的宽带合路器合路输出，并通过功放&衰减模块2得到幅度可调的宽频带高本振抑制度的调制信号；调制信号的带宽范围为DC～5GHz；调制信号产生模块的中频信号输入范围为DC～5GHz，即所述的调制信号范围为DC～5GHz；调制信号与本振信号经过I、Q混频，通过调制信号产生模块与本振抑制校准模块合路输出宽带调制信号，该信号的频率范围为6GHz～28GHz。3. the modulator of a kind of broadband high local oscillation suppression degree according to claim 1 and 2, it is characterized in that, in described modulation signal generation module, from local oscillator 1 and intermediate frequency signal input that are produced in local oscillation signal generation module The quadrature intermediate frequency signal in the module is mixed by I and Q mixer 1 to obtain a broadband modulation signal; the negative pressure module in the local oscillator suppression calibration module generates an adjustable negative pressure value as the intermediate frequency input of I and Q mixer 2 The negative pressure signal is mixed with the local oscillator 2 in the local oscillator signal generation module to obtain an inverted local oscillator signal, and then the amplitude adjustment module in the local oscillator suppression calibration module adjusts the amplitude of the inverted local oscillator and outputs it Inverted local oscillator; the two output signals are combined and output through the broadband combiner in the modulation output module, and the modulated signal with adjustable amplitude wideband and high LO suppression is obtained through the power amplifier & attenuation module 2; the bandwidth range of the modulated signal is DC～5GHz; the input range of the intermediate frequency signal of the modulation signal generation module is DC～5GHz, that is, the modulation signal range is DC～5GHz; the modulation signal and the local oscillator signal are mixed by I and Q, and the modulation signal generation module and the local oscillator The vibration suppression calibration module is combined to output a broadband modulation signal, and the frequency range of the signal is 6GHz to 28GHz. 4.根据权利要求1所述的一种宽频带高本振抑制度的调制器，其特征在于，所述本振抑制校准模块中的负压模块由高位数精密DAC电路与运放电路组成；DAC电路产生低噪声、大小精确可调的直流电压，并通过运放反相电路产生负直流电压作为本振抑制校准模块中I、Q混频器2中频输入信号，从而实现宽频带的180度的精准相移；所述I、Q混频器2采用负直流电压加载入I、Q混频器2，产生与调制信号产生模块中的本振信号有180度相移的本振校准信号。4. the modulator of a kind of broadband high local oscillation suppression degree according to claim 1, is characterized in that, the negative pressure module in described local oscillation suppression calibration module is made up of high-digit precision DAC circuit and operational amplifier circuit; DAC circuit Generate low-noise, accurate and adjustable DC voltage, and generate negative DC voltage through the op amp inverting circuit as the IF input signal of I, Q mixer 2 in the local oscillation suppression calibration module, so as to achieve 180-degree accuracy in the wide frequency band Phase shift; the I, Q mixer 2 uses negative DC voltage to load into the I, Q mixer 2 to generate a local oscillator calibration signal with a phase shift of 180 degrees from the local oscillator signal in the modulation signal generating module. 5.根据权利要求1所述的一种宽频带高本振抑制度的调制器，其特征在于，所述功放&衰减模块1和功放&衰减模块2都包括宽频带步进衰减器与功率放大器，工作频率范围为6GHz～28GHz。其中本振信号产生模块中的功放&衰减模块1与调制输出模块中的功放&衰减模块2，电路形式是相同；本振信号通过功放&衰减模块1将功率调至理想大小，具体实现方法是通过宽频功率放大器将本振信号放大，并通过可控的步进衰减器将功率大小调整到环路最优，最终本振抑制校准模块的输出信号作为一路合路信号；为保持输入输出端动态平衡，在功放的前后两端各放置数控衰减器1和数控衰减器2。5. the modulator of a kind of broadband high local oscillation suppression degree according to claim 1, is characterized in that, described power amplifier & attenuation module 1 and power amplifier & attenuation module 2 all comprise broadband step attenuator and power amplifier, work The frequency range is 6GHz to 28GHz. The power amplifier & attenuation module 1 in the local oscillator signal generation module and the power amplifier & attenuation module 2 in the modulation output module have the same circuit form; the power of the local oscillator signal is adjusted to an ideal size through the power amplifier & attenuation module 1, and the specific implementation method is as follows: The local oscillator signal is amplified by the broadband power amplifier, and the power is adjusted to the optimal loop through the controllable step attenuator. Finally, the output signal of the local oscillator suppression calibration module is used as a combined signal; For balance, place digital attenuator 1 and digital attenuator 2 at the front and rear ends of the power amplifier. 6.根据权利要求1所述的一种宽频带高本振抑制度的调制器，其特征在于，所述本振信号产生模块中的功分模块与调制输出模块中的合路器通用；采用六阶威尔金森结构，其工作频率范围为5GHz～30GHz，隔离度高；频率范围为6～28GHz的本振信号通过功率&衰减模块1后通过功分模块产生两路功率大小相等、相位相同的两路信号本振1和本振2分别作为本振抑制校准模块与调制信号产生模块的本振信号；通过合路器将调制信号产生模块产生的宽带调制信号与本振抑制校准模块产生的反相本振的两路信号合路，产生系统最终射频输出信号；功分模块与合路器的幅度平衡度、相位平衡度、隔离度影响合成射频信号的本振抑制性能。6. the modulator of a kind of broadband high local oscillation suppression degree according to claim 1, is characterized in that, the power division module in described local oscillator signal generation module and the combiner in modulation output module are common; Adopt sixth-order The Wilkinson structure has an operating frequency range of 5GHz to 30GHz and high isolation; the local oscillator signal with a frequency range of 6 to 28GHz passes through the power & attenuation module 1 and then passes through the power division module to generate two channels of equal power and the same phase. LO 1 and LO 2 are used as the local oscillator signals of the LO suppression calibration module and the modulation signal generation module respectively; the broadband modulation signal generated by the modulation signal generation module and the broadband modulation signal generated by the LO suppression calibration module are reversed through the combiner. The two signals of the local oscillator are combined to generate the final RF output signal of the system; the amplitude balance, phase balance and isolation of the power division module and the combiner affect the local oscillator suppression performance of the synthesized RF signal. 7.根据权利要求1所述的一种宽频带高本振抑制度的调制器，其特征在于，所述本振抑制校准模块中的负压模块是由DAC的控制电路和运放电路组成的，即所述负压模块主要包括LDO_I、LDO_Q、DAC_I、DAC_Q、运放I和运放Q组成；负压模块为本振抑制校准模块提供低噪声且大小精确可控的负直流电压作为中频输入信号，负压与本振信号混频可得到反相本振信号；负压模块工作方法是，LDO产生低噪声稳定的电压作为DAC的供电电压，MCU产生的SPI信号作为DAC的输入信号控制DAC以输出精确模拟电压，DAC的输出电压作为反相运放电路的输入信号，最后运放电路输出的负压作为本振抑制校准模块的中频输入信号。7. The modulator of a wide-band high local oscillation suppression degree according to claim 1, wherein the negative pressure module in the local oscillation suppression calibration module is composed of a control circuit of a DAC and an operational amplifier circuit, that is, The negative pressure module mainly includes LDO_I, LDO_Q, DAC_I, DAC_Q, operational amplifier I and operational amplifier Q; The negative voltage and the local oscillator signal can be mixed to obtain the inverse local oscillator signal; the working method of the negative pressure module is that the LDO generates a low-noise and stable voltage as the power supply voltage of the DAC, and the SPI signal generated by the MCU is used as the input signal of the DAC to control the DAC to output Accurate analog voltage, the output voltage of the DAC is used as the input signal of the inverting operational amplifier circuit, and the negative voltage output by the final operational amplifier circuit is used as the intermediate frequency input signal of the local oscillation suppression calibration module. 8.根据权利要求1所述的一种宽频带高本振抑制度的调制器，其特征在于，所述本振信号产生模块中的功放&衰减模块1主要包括数控衰减器和放大器，实现可变增益功能；幅度调整模块的功能是将接收到的反相本振输入信号进行可控衰减输出，通过输入控制字改变衰减值，观察系统输出性能，确定在特定频点处的衰减最优值，幅度调整模块的输出反相本振作为一路合路信号。8. the modulator of a kind of broadband high local oscillation suppression degree according to claim 1, is characterized in that, the power amplifier & attenuation module 1 in described local oscillation signal generation module mainly comprises numerical control attenuator and amplifier, realizes variable gain Function: The function of the amplitude adjustment module is to controllable attenuation output of the received inverse local oscillator input signal, change the attenuation value by inputting the control word, observe the output performance of the system, and determine the optimal attenuation value at a specific frequency point, the amplitude The output inversion local oscillator of the adjustment module is used as a combined signal. 9.根据权利要求1所述的一种宽频带高本振抑制度的调制器，其特征在于，所述调制信号产生模块中的中频信号输入模块主要包括中频自动增益控制电路，工作频率范围为DC～5GHz；中频信号输入模块的功能是为调制信号产生模块提供调制信号，来自基带I和基带Q信号，经过中频自动增益控制电路各自放大输出，输出的I、Q信号幅度可调，可以进一步抑制I、Q混频器的输出的本振信号。9 . The modulator with a wide frequency band and high local oscillation suppression degree according to claim 1 , wherein the intermediate frequency signal input module in the modulation signal generation module mainly comprises an intermediate frequency automatic gain control circuit, and the working frequency range is DC～ 5GHz; the function of the intermediate frequency signal input module is to provide the modulation signal for the modulation signal generation module, which comes from the baseband I and baseband Q signals, and is amplified and output by the intermediate frequency automatic gain control circuit. The output I and Q signal amplitudes are adjustable, which can further suppress I , the local oscillator signal of the output of the Q mixer. 10.根据权利要求1所述的一种宽频带高本振抑制度的调制器，其特征在于，所述MCU发出控制信号对功放&衰减模块1和2中的数控衰减器进行控制，将功率大小调整到模块最优值；由MCU发出SPI信号对负压模块中的高精度DAC_I和DAC_Q进行控制，通过精准调整负压大小来调整反相本振信号的大小。通过MCU的控制，使本振信号产生模块、本振抑制校准模块、调制输出模块的功率输出精准可调，进而实现宽频带高本振抑制度的调制器。10. the modulator of a kind of broadband high local oscillation suppression degree according to claim 1, is characterized in that, described MCU sends control signal to control the numerical control attenuator in power amplifier & attenuation module 1 and 2, and power size is adjusted to the optimal value of the module; the MCU sends SPI signals to control the high-precision DAC_I and DAC_Q in the negative pressure module, and adjusts the magnitude of the inverse local oscillator signal by precisely adjusting the magnitude of the negative pressure. Through the control of the MCU, the power output of the local oscillator signal generation module, the local oscillator suppression calibration module, and the modulation output module can be precisely adjusted, thereby realizing a broadband modulator with high local oscillator suppression.
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