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 PDFInfo
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Abstract
The invention discloses 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; the local oscillation signal generating module comprises a broadband frequency synthesizer, a power amplifier & attenuation module 1 and a power division module which are sequentially connected in series, 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 modulation output module comprises a combiner and a power amplifier & 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 modulator is used in wideband transmitter and wideband high performance instrument and has the features of wide frequency band and high local vibration suppression degree.
Description
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. A modulator having a wide frequency band and a high degree of intrinsic vibration suppression, 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 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 signal required by the modulating signal generating module and a local oscillation 2 signal 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 modulator according to claim 1, wherein the wideband modulation signal output by the modulation signal generation module and the local oscillator with opposite phase output by the local oscillator suppression calibration module are synthesized to suppress the local oscillator signal of the modulation signal, and 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 I, Q signal to obtain the wideband modulation signal, the local oscillator suppression calibration module generates a signal with opposite phase to the local oscillator in the modulation signal generation module, and the amplitude of the local oscillator with opposite phase is adjusted by the 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.
3. The modulator according to claims 1 and 2, wherein in the modulation signal generating module, the local oscillator 1 generated from the local oscillator signal generating module and the quadrature intermediate frequency signal in the intermediate frequency signal input module are mixed by the I, Q mixer 1 to obtain the wideband 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.
4. The modulator according to claim 1, wherein the negative voltage module in the local oscillation suppression calibration module comprises a high-bit precision 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.
5. The modulator of claim 1, wherein the power amplifier & attenuation module 1 and the power amplifier & attenuation module 2 both comprise a broadband step attenuator and a power amplifier, and the operating 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.
6. The modulator according to claim 1, wherein the power division module of the local oscillation signal generation module is common to the combiner of 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.
7. The modulator according to claim 1, wherein the negative voltage module in the local oscillation suppression calibration module is composed of a control circuit of DAC and an operational amplifier circuit, that is, the negative voltage module mainly includes LDO _ I, LDO _ Q, DAC _ I, DAC _ Q, operational amplifier I and 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.
8. The modulator according to claim 1, wherein the power amplifier & attenuation module 1 in the local oscillation signal generating module mainly comprises a numerical control attenuator and an amplifier to realize a variable gain function; 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.
9. The modulator according to claim 1, wherein the intermediate frequency signal input module of the modulation signal generating module mainly comprises an intermediate frequency automatic gain control circuit, and the operating 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.
10. The modulator of claim 1, wherein the MCU sends out control signals to control the digital controlled attenuators in the power amplifier and attenuation modules 1 and 2 to adjust the power level to the optimal value of the module; 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.
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