技术领域technical field
本发明涉及通用射频微波信号源领域，特别是涉及一种基于门限判断的深度调幅电路，还涉及一种基于门限判断的深度调幅方法。The invention relates to the field of general radio frequency microwave signal sources, in particular to a depth amplitude modulation circuit based on threshold judgment, and also relates to a depth modulation method based on threshold judgment.
背景技术Background technique
在通用射频微波信号源领域，一般采用ALC(对信号源输出信号的功率进行自动、精确控制)功率参考叠加调幅信号的方式实现射频微波信号源整机的调幅输出。调幅电路与ALC电路共同实现了功率的稳定控制与幅度调制。In the field of general radio frequency microwave signal sources, the ALC (automatic and precise control of the power of the signal source output signal) power reference superimposed amplitude modulation signal is generally used to realize the amplitude modulation output of the radio frequency microwave signal source. The amplitude modulation circuit and the ALC circuit together realize the stable control and amplitude modulation of the power.
如图1所示，现有的射频微波信号源调幅电路中，功率参考叠加调幅信号后形成前馈信号首先作用到线性衰减器上，同时前馈信号和受控射频电平的检波放大信号同步到达积分器前的求和电路，其微小差值再通过积分负反馈电路进一步修正射频功率电平。As shown in Figure 1, in the existing RF microwave signal source amplitude modulation circuit, the power reference superimposes the amplitude modulation signal to form a feedforward signal that first acts on the linear attenuator, and at the same time the feedforward signal is synchronized with the detection and amplification signal of the controlled RF level Before reaching the summation circuit of the integrator, the tiny difference is further corrected by the integral negative feedback circuit to the radio frequency power level.
图1中所示调幅电路可以在一定调幅深度范围内进行准确调制，但是当调幅深度达到ALC能力极限时，调幅和ALC控制将出现冲突，这给通用射频微波信号源的更高指标实现带来挑战。The AM circuit shown in Figure 1 can perform accurate modulation within a certain range of AM depth, but when the AM depth reaches the limit of ALC capability, AM and ALC control will conflict, which will bring higher indicators to the realization of general RF microwave signal sources. challenge.
发明内容Contents of the invention
为解决现有技术存在的上述缺点，本发明提供一种基于门限判断的深度调幅电路及调幅方法。In order to solve the above-mentioned shortcomings in the prior art, the present invention provides a deep amplitude modulation circuit and an amplitude modulation method based on threshold judgment.
本发明的技术方案是这样实现的：Technical scheme of the present invention is realized like this:
一种基于门限判断的深度调幅电路，包括：功率参考、调幅信号、定向耦合器、检波器、对数放大器、积分单元、电压比较器、受控开关、线性调制器，调幅电路与ALC电路共同实现功率的稳定控制与幅度调制；A deep amplitude modulation circuit based on threshold judgment, including: power reference, amplitude modulation signal, directional coupler, detector, logarithmic amplifier, integration unit, voltage comparator, controlled switch, linear modulator, amplitude modulation circuit and ALC circuit Realize stable power control and amplitude modulation;
功率参考叠加调幅信号后形成前馈信号，首先作用到线性衰减器上，同时前馈信号和受控射频电平的检波放大信号同步到达积分单元前的求和电路，其微小差值再通过积分单元进一步修正射频功率电平；The power reference superimposes the amplitude modulation signal to form a feedforward signal, which first acts on the linear attenuator, and at the same time the feedforward signal and the detection and amplification signal of the controlled RF level reach the summation circuit before the integration unit synchronously, and the small difference is passed through the integration The unit further modifies the radio frequency power level;
电压比较器控制积分单元前端的受控开关，电压比较器的输入是调幅深度门限信号和前馈信号，当前馈信号大于等于调幅深度门限信号时，电压比较器控制开关导通，积分器处于积分的状态；当前馈信号小于调幅深度门限信号时，电压比较器控制开关断开，积分器处于保持的状态。The voltage comparator controls the controlled switch at the front end of the integration unit. The input of the voltage comparator is the amplitude modulation depth threshold signal and the feedforward signal. state; when the feedforward signal is less than the amplitude modulation depth threshold signal, the voltage comparator control switch is turned off, and the integrator is in a holding state.
可选地，所述电压比较器用于深度调幅门限检测并输出控制信号。Optionally, the voltage comparator is used for deep amplitude modulation threshold detection and outputs a control signal.
可选地，所述受控开关用于积分单元的状态控制，使积分单元处于积分或保持状态。Optionally, the controlled switch is used for state control of the integration unit, so that the integration unit is in the integration or holding state.
可选地，当前馈信号大于等于调幅深度门限信号时，电压比较器控制受控开关导通，积分单元处于积分的状态，ALC电路闭环并且由调幅信号实时控制射频信号的输出功率。Optionally, when the feedforward signal is greater than or equal to the amplitude modulation depth threshold signal, the voltage comparator controls the controlled switch to turn on, the integration unit is in the integration state, the ALC circuit is closed-loop and the output power of the radio frequency signal is controlled in real time by the amplitude modulation signal.
可选地，当前馈信号小于调幅深度门限信号时，电压比较器控制开关断开，积分单元处于保持的状态，ALC电路开环保持，由前馈信号控制线性调制器实现调幅输出。Optionally, when the feedforward signal is smaller than the amplitude modulation depth threshold signal, the voltage comparator controls the switch to be turned off, the integration unit is in a hold state, the ALC circuit is open-loop hold, and the feedforward signal controls the linear modulator to realize the amplitude modulation output.
本发明还提出了一种基于门限判断的深度调幅方法，包括：功率参考、调幅信号、定向耦合器、检波器、对数放大器、积分单元、电压比较器、受控开关、线性调制器，调幅电路与ALC电路共同实现功率的稳定控制与幅度调制；The present invention also proposes a deep amplitude modulation method based on threshold judgment, including: power reference, amplitude modulation signal, directional coupler, detector, logarithmic amplifier, integration unit, voltage comparator, controlled switch, linear modulator, amplitude modulation The circuit and the ALC circuit jointly realize the stable control and amplitude modulation of the power;
功率参考叠加调幅信号后形成前馈信号，首先作用到线性衰减器上，同时前馈信号和受控射频电平的检波放大信号同步到达积分单元前的求和电路，其微小差值再通过积分单元进一步修正射频功率电平；The power reference superimposes the amplitude modulation signal to form a feedforward signal, which first acts on the linear attenuator, and at the same time the feedforward signal and the detection and amplification signal of the controlled RF level reach the summation circuit before the integration unit synchronously, and the small difference is passed through the integration The unit further modifies the radio frequency power level;
电压比较器控制积分单元前端的受控开关，电压比较器的输入是调幅深度门限信号和前馈信号，当前馈信号大于等于调幅深度门限信号时，电压比较器控制开关导通，积分单元处于积分的状态；当前馈信号小于调幅深度门限信号时，电压比较器控制开关断开，积分单元处于保持的状态。The voltage comparator controls the controlled switch at the front end of the integration unit. The input of the voltage comparator is the amplitude modulation depth threshold signal and the feedforward signal. state; when the feedforward signal is less than the amplitude modulation depth threshold signal, the voltage comparator control switch is turned off, and the integration unit is in a holding state.
可选地，所述电压比较器用于深度调幅门限检测并输出控制信号。Optionally, the voltage comparator is used for deep amplitude modulation threshold detection and outputs a control signal.
可选地，所述受控开关用于积分单元的状态控制，使积分单元处于积分或保持状态。Optionally, the controlled switch is used for state control of the integration unit, so that the integration unit is in the integration or holding state.
可选地，当前馈信号大于等于调幅深度门限信号时，电压比较器控制受控开关导通，积分单元处于积分的状态，ALC电路闭环并且由调幅信号实时控制射频信号的输出功率。Optionally, when the feedforward signal is greater than or equal to the amplitude modulation depth threshold signal, the voltage comparator controls the controlled switch to turn on, the integration unit is in the integration state, the ALC circuit is closed-loop and the output power of the radio frequency signal is controlled in real time by the amplitude modulation signal.
可选地，当前馈信号小于调幅深度门限信号时，电压比较器控制开关断开，积分单元处于保持的状态，ALC电路开环保持，由前馈信号控制线性调制器实现调幅输出。Optionally, when the feedforward signal is smaller than the amplitude modulation depth threshold signal, the voltage comparator controls the switch to be turned off, the integration unit is in a hold state, the ALC circuit is open-loop hold, and the feedforward signal controls the linear modulator to realize the amplitude modulation output.
本发明的有益效果是：The beneficial effects of the present invention are:
(1)可以实现深度调幅输出，提高射频微波信号源的性能指标。(1) It can realize deep amplitude modulation output and improve the performance index of radio frequency microwave signal source.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.
图1为现有通用射频微波信号源调幅电路结构示意图；Fig. 1 is the structural schematic diagram of existing general radio frequency microwave signal source amplitude modulation circuit;
图2为本发明的一种基于门限判断的深度调幅电路结构示意图。FIG. 2 is a schematic structural diagram of a deep amplitude modulation circuit based on threshold judgment in the present invention.
具体实施方式detailed description
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
如图2所示，本发明提出了一种基于门限判断的深度调幅电路，包括：参考电平、调幅信号、定向耦合器、检波器、对数放大器、积分单元、电压比较器、受控开关、线性调制器，调幅电路与ALC电路共同实现功率的稳定控制与幅度调制。As shown in Figure 2, the present invention proposes a depth amplitude modulation circuit based on threshold judgment, including: reference level, amplitude modulation signal, directional coupler, wave detector, logarithmic amplifier, integration unit, voltage comparator, controlled switch , A linear modulator, an amplitude modulation circuit and an ALC circuit together realize stable power control and amplitude modulation.
电压比较器控制积分单元前端的受控开关，电压比较器的输入是调幅深度门限信号和前馈信号，当前馈信号大于等于调幅深度门限信号时，电压比较器控制开关导通，积分单元处于积分的状态；当前馈信号小于调幅深度门限信号时，电压比较器控制开关断开，积分单元处于保持的状态。The voltage comparator controls the controlled switch at the front end of the integration unit. The input of the voltage comparator is the amplitude modulation depth threshold signal and the feedforward signal. state; when the feedforward signal is less than the amplitude modulation depth threshold signal, the voltage comparator control switch is turned off, and the integration unit is in a holding state.
在轻度调幅时，前馈信号不足以触发电压比较器使开关断开，因此积分单元处于积分状态，整个ALC环路闭环并且由调幅信号实时控制射频信号的输出功率，从而实现调幅输出。In mild AM, the feed-forward signal is not enough to trigger the voltage comparator to turn off the switch, so the integrating unit is in the integrating state, the entire ALC loop is closed and the output power of the RF signal is controlled by the AM signal in real time, thereby realizing the AM output.
在深度调幅时，每个调幅周期前馈信号会越过调幅深度门限信号，当前馈信号大于等于调幅深度门限信号时，电压比较器控制开关导通，积分单元积分，ALC闭环实时控制射频信号输出功率；当前馈信号小于调幅深度门限信号时，电压比较器控制开关断开，积分单元保持，ALC开环保持，这时由前馈信号继续控制线性调制器实现深度调幅输出。In deep AM, the feedforward signal of each AM cycle will cross the AM depth threshold signal. When the feedforward signal is greater than or equal to the AM depth threshold signal, the voltage comparator controls the switch to conduct, the integration unit integrates, and the ALC closed loop controls the output power of the RF signal in real time. ; When the feedforward signal is less than the amplitude modulation depth threshold signal, the voltage comparator control switch is turned off, the integral unit is maintained, and the ALC open loop is maintained. At this time, the feedforward signal continues to control the linear modulator to realize the deep amplitude modulation output.
本发明提供了一种基于门限判断的深度调幅电路及调幅方法，可以实现深度调幅输出，提高射频微波信号源的性能指标。The invention provides a deep amplitude modulation circuit and an amplitude modulation method based on threshold judgment, which can realize the deep amplitude modulation output and improve the performance index of the radio frequency microwave signal source.
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.
| Application Number | Priority Date | Filing Date | Title |
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| CN201610723194.7ACN106341086A (en) | 2016-08-17 | 2016-08-17 | Deep amplitude modulation circuit based on threshold judgment, and amplitude modulation method |
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| CN201610723194.7ACN106341086A (en) | 2016-08-17 | 2016-08-17 | Deep amplitude modulation circuit based on threshold judgment, and amplitude modulation method |
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| CN201610723194.7APendingCN106341086A (en) | 2016-08-17 | 2016-08-17 | Deep amplitude modulation circuit based on threshold judgment, and amplitude modulation method |
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