CN108809271B - ALC circuit and radio frequency signal source - Google Patents
ALC circuit and radio frequency signal source Download PDFInfo
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- CN108809271B CN108809271B CN201710301334.6A CN201710301334A CN108809271B CN 108809271 B CN108809271 B CN 108809271B CN 201710301334 A CN201710301334 A CN 201710301334A CN 108809271 B CN108809271 B CN 108809271B
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- H—ELECTRICITY
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- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
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- H—ELECTRICITY
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- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
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- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
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Abstract
The application provides an ALC circuit and a radio frequency signal source, wherein the ALC circuit comprises an input port, a radio frequency link connected with the input port, a feedback loop connected with the radio frequency link and an output port, the radio frequency link comprises a variable attenuator connected with the input port, a first radio frequency amplifier connected with the variable attenuator, a temperature compensation module connected with the first radio frequency amplifier, a second radio frequency amplifier connected with the temperature compensation module and a power distributor connected with the second radio frequency amplifier; the feedback loop comprises a detector connected with the power distributor, a digital acquisition module connected with the detector, a digital processing module connected with the digital acquisition module, and a digital-to-analog conversion module connected with the digital processing module. The application reduces the influence of temperature on the gain of the radio frequency link, thereby saving the calibration time and improving the production efficiency.
Description
Technical Field
The application relates to the technical field of microwave radio frequency, in particular to a general instrument in the field of microwave radio frequency, and specifically relates to an ALC circuit and a radio frequency signal source.
Background
The radio frequency signal source is a general instrument in the microwave radio frequency field and can provide a specific radio frequency signal with stable output. Is widely applied to various fields of scientific research, education, industry and the like. The two main indexes of the radio frequency signal source are frequency range and amplitude dynamics. The main indexes of the amplitude comprise amplitude precision, minimum amplitude stepping and dynamic range. The automatic level control ALC circuit is a main circuit for realizing the amplitude control section.
The amplitude stabilizing device is needed for the radio frequency signal source to output the radio frequency signal with accurate amplitude. The conventional method uses an analog ALC loop, the specific implementation of the analog ALC loop is as shown in fig. 1, a radio frequency input signal is sent to a post-stage amplifying circuit for output through a variable attenuation unit, a small part of signal is split by using power distribution at an output end, an amplitude signal is converted into a voltage signal through a detection unit circuit, the voltage signal is compared with a reference voltage value through conversion 1 (such as logarithmic amplification) and is output through an integral accumulation circuit, and the variable attenuation circuit in a radio frequency link is controlled through conversion 2.
With the improvement of the digital processing capability, the stability of the digital circuit can reduce the difficulty of analog conversion, improve the stability of a loop, and a digital ALC implementation block diagram is shown in fig. 2. The radio frequency signal (RF_in) is output through an adjustable attenuator, a radio frequency amplifier and a directional coupler; meanwhile, the directional coupler couples part of the radio frequency signals to the input end of the detector according to a fixed proportion. The output signal of the detector is directly digitized by using an ADC and enters the FPGA. The processor processes the detection signal and then directly generates a control signal (digital form) of the adjustable attenuator, converts the detection signal into an analog signal through the DAC and then controls the adjustable attenuator to realize the automatic level control function. The matching resistor is matched with the directional coupler.
The internal block diagram of the processor in fig. 2 is shown in fig. 3, the voltage value sampled by the ADC is subtracted from the zero value 101 (the ADC sampling voltage when no RF signal is input), the output error is compared with the reference DAC 104 by the linear amplifying unit 103 and is sent to the post-log amplifier module 102, and the output error is added to the preset voltage (the preset voltage acts to provide the preset initial voltage of the attenuation curve and improve the ALC loop settling time.) the accumulator 105 is added, the DAC device is controlled by the output stage voltage conversion 106, and the function of the partial conversion of the voltage conversion 106 is to fit the attenuation curve of the attenuation unit. So that its input is linear. The linear curve easily controls the amount of attenuation and subsequent functional expansion, thereby changing the control voltage or current of the variable attenuator.
Temperature compensation in the digital scheme is implemented in the logarithmic amplification 102 module, greatly improving the effect of temperature on the ALC loop. This scheme is feasible in the ALC ON state, and temperature compensation can reduce the influence of the temperature in its ALC ON state ON the amplitude. However, in the implementation process of the scheme, the influence of temperature change on an ALC loop is required to be calibrated, the link time is longer, and the efficiency is low. Furthermore, an ALC OFF state is present in the ALC block circuit, in which case the influence of the temperature variation in the ALC OFF state on the amplitude cannot be solved.
Disclosure of Invention
In order to overcome the defects in the prior art, the application provides the ALC circuit and the radio frequency signal source, and the temperature compensation module is added in the radio frequency link, so that the influence of temperature on the gain of the radio frequency link is reduced, the calibration time is saved, and the production efficiency is improved.
It is an object of the present application to provide an ALC circuit comprising an input port, a radio frequency link connected to the input port, a feedback loop connected to the radio frequency link, and an output port;
the input port is used for inputting a radio frequency signal;
the radio frequency link comprises:
the variable attenuator is connected with the input port and used for carrying out attenuation treatment on the radio frequency signals;
the first radio frequency amplifier is connected with the variable attenuator and is used for amplifying the radio frequency signal after attenuation treatment;
the temperature compensation module is connected with the first radio frequency amplifier and is used for performing temperature compensation on the amplified radio frequency signals;
the second radio frequency amplifier is connected with the temperature compensation module and is used for amplifying the radio frequency signal after temperature compensation;
the power distributor is connected with the second radio frequency amplifier and is used for outputting the amplified radio frequency signal through the output port and outputting a coupling radio frequency signal according to a preset ratio value;
the feedback loop includes:
the detector is connected with the power distributor and used for converting the coupled radio frequency signals into corresponding voltage signals;
the digital acquisition module is connected with the detector and is used for acquiring the voltage signal;
the digital processing module is connected with the digital acquisition module and is used for fitting and outputting a control signal according to the voltage signal;
and the digital-to-analog conversion module is connected with the digital processing module and is used for performing digital-to-analog conversion on the control signal and outputting the control signal to the variable attenuator so as to control the variable attenuator.
In a preferred embodiment of the application, the temperature compensation module is a temperature compensation attenuator or pi-net attenuator constructed using a reverse thermistor.
In a preferred embodiment of the present application, the ALC circuit further includes a matching resistor coupled to the power divider.
In a preferred embodiment of the application, the detector further comprises a first temperature sensor for acquiring temperature data of the detector, referred to as first temperature data.
In a preferred embodiment of the present application, the digital acquisition module further comprises a second temperature sensor for acquiring temperature data of the digital acquisition module, referred to as second temperature data.
In a preferred embodiment of the present application, the digital processing module includes: the logarithmic amplifier is connected with the digital acquisition module and is used for carrying out logarithmic amplification processing on the voltage signal;
the linear amplification unit is connected with the logarithmic amplifier and is used for linearly amplifying the voltage signal after logarithmic amplification;
the integrating unit is connected with the linear amplifying module and is used for carrying out integral processing on the voltage signal after linear amplifying and sending the voltage signal after integral processing to a rear-stage accumulator connected with the loop state control module through the loop state control module connected with the integrating unit;
the post accumulator is used for accumulating preset voltage, the voltage signal after the integration processing, the voltage variation corresponding to the first temperature data and the second temperature data to obtain an accumulated value;
and the voltage conversion unit is connected with the rear-stage accumulator and is used for carrying out voltage change on the accumulated value to obtain a control signal.
In a preferred embodiment of the application, the logarithmic amplifier comprises a first pre-switch;
a second pre-selection switch;
a linear amplifying unit;
the subtracter is connected with the linear amplifying unit in parallel and the logarithmic amplifying and converting unit is connected with the logarithmic amplifying and converting unit in series;
and a reference value input unit connected with the subtracter.
In a preferred embodiment of the present application, the integrating unit includes an integrator and a coefficient of variation output unit connected to the integrator.
In a preferred embodiment of the present application, the post accumulator includes:
the first temperature compensation conversion unit is used for receiving the first temperature data, determining a first temperature variation according to the first temperature data, and calculating a first voltage variation according to a prestored temperature drift index, detection slope and attenuation slope curve of the detector and combining the first temperature variation;
the second temperature compensation conversion unit is used for receiving the second temperature data, determining a second temperature variation according to the second temperature data, and calculating a second voltage variation according to a pre-stored temperature drift coefficient of the digital acquisition module and combining the second temperature variation;
a preset voltage input unit for storing a preset voltage set in advance;
and the accumulator is respectively connected with the preset voltage input unit, the first temperature compensation conversion unit, the second temperature compensation conversion unit and the loop state control unit and is used for accumulating the preset voltage, the first voltage variation, the second voltage variation and the voltage signals output by the loop state control unit to obtain an accumulated value.
It is an object of the present application to provide a radio frequency signal source comprising a radio frequency signal source body and an ALC circuit.
The application has the beneficial effects that the ALC circuit and the radio frequency signal source are provided, the temperature compensation module is added in the radio frequency link, the temperature sensor is added in the detector and the digital acquisition module to monitor the temperature, the error caused by the temperature is compensated in real time through the temperature characteristic of the device, the influence of the temperature on the gain of the radio frequency link is reduced, the calibration time is further saved, the production efficiency is improved, and the influence of the temperature amplitude of the loop in the ALC OFF state is reduced.
The foregoing and other objects, features and advantages of the application will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art analog ALC;
FIG. 2 is a schematic diagram of a prior art digital ALC loop;
FIG. 3 is a schematic diagram of the internal structure of a digital ALC in the prior art;
fig. 4 is a schematic structural diagram of a radio frequency signal source according to an embodiment of the present application;
FIG. 5 is a schematic diagram of an ALC circuit according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a digital processing block in an ALC circuit according to an embodiment of the present application;
FIG. 7 is a schematic diagram of the gain curve of the device at high and low temperatures of the RF amplifier;
fig. 8 is a schematic diagram of an attenuation curve of a temperature compensated attenuator.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The principles and spirit of the present application are explained in detail below with reference to several representative embodiments thereof.
The application provides an ALC circuit and a radio frequency signal source aiming at the problem that the temperature compensation of a digital ALC loop in the prior art is realized in a logarithmic amplification module, so that the influence of temperature change in an ALC OFF state on amplitude cannot be solved.
Fig. 4 is a block diagram of a radio frequency signal source according to an embodiment of the present application, referring to fig. 4, the radio frequency signal source includes a radio frequency signal source body 100 and an ALC circuit 200.
Fig. 5 is a schematic structural diagram of an ALC circuit according to an embodiment of the present application, referring to fig. 5, the ALC circuit includes an input port, a radio frequency link connected to the input port, a feedback loop connected to the radio frequency link, and an output port.
Wherein, the input port (i.e. IN fig. 5) is used for inputting a radio frequency signal;
the radio frequency link comprises:
a variable attenuator 201 connected to the input port, for attenuating the radio frequency signal;
a first rf amplifier 202 connected to the variable attenuator, for amplifying the attenuated rf signal;
and the temperature compensation module 203 is connected with the first radio frequency amplifier and is used for performing temperature compensation on the amplified radio frequency signal. In a specific embodiment, the temperature compensation module is a temperature compensation attenuator or a pi-net attenuator built using a reverse thermistor.
The second radio frequency amplifier 204 is connected with the temperature compensation module and is used for amplifying the radio frequency signal after temperature compensation;
in other embodiments of the present application, the number of rf amplifiers may be more than two, for example, between the variable attenuator 201 and the temperature compensation module 203 and between the temperature compensation module 203 and the power divider 205.
The power divider 205 is connected to the second rf amplifier, and is configured to output the amplified rf signal through the output port (i.e. OUT in fig. 5), and output a coupled rf signal according to a preset ratio.
In a specific embodiment, a ratio value is preset, such as between 1% and 2%, and the specific meaning of the ratio value is: and inputting a part of radio frequency signals coupled out of the proportion value into a feedback loop, wherein the proportion of the part of radio frequency signals to the total radio frequency signals is the proportion value, and the part of radio frequency signals are converted into coupled radio frequency signals. During actual use, the ratio value may be set with reference to the sensitivity of the detector 206.
The feedback loop includes:
a detector 206 connected to the power divider for converting the coupled radio frequency signal into a corresponding voltage signal;
a digital acquisition module ADC207 connected to the detector, for acquiring the voltage signal;
the digital processing module FPGA208 is connected with the digital acquisition module and is used for fitting and outputting a control signal according to the voltage signal;
and the digital-to-analog conversion module DAC209 is connected with the digital processing module and is used for performing digital-to-analog conversion on the control signal and outputting the control signal to the variable attenuator so as to control the variable attenuator.
The application adds a temperature compensation module in the radio frequency link to participate in a temperature change curve in the reverse compensation link. The devices on the radio frequency link in the ALC loop are mainly radio frequency amplifiers which are obviously affected by temperature. The gain of a common radio frequency amplifier decreases with increasing temperature, and the temperature characteristic of the temperature compensation circuit decreases with increasing temperature.
Illustrating: the effect of temperature on the main road is optimized using a temperature compensated attenuator. The gain temperature change coefficient (Gain Varition Over Temperature) of a common amplifier device is (A) dB/. Degree.C.that is, the gain of the amplifier at a specific temperature is:
gain_t= [ Gain-a (T-T0) ] dB (formula 1)
Wherein gain_T is the Gain of the amplifying device at T temperature;
t is the real-time temperature;
a is the gain temperature coefficient (common coefficient is 0.015 dB/DEG C) of the amplifying device;
t0 is at normal temperature, typically 25 ℃.
A gain curve of the device under high and low temperature conditions is shown in fig. 7.
The attenuation curves of the temperature compensation attenuator are opposite, namely the attenuation amount of the attenuator becomes smaller when the temperature is high, and the attenuation curve is marked as follows by using a formula:
att_t (dB) =att (dB) -B (T-T0) (equation 2)
Wherein att_t represents the attenuation amount of the attenuator at the temperature T;
att represents the normal temperature attenuation;
b is a temperature change coefficient (commonly ranging from 0.003 dB/DEG C to 0.01 dB/DEG C);
t0 is at normal temperature, typically 25 ℃.
The attenuation curve of a conventional temperature compensated attenuator 203 (thermistor set up) is shown in fig. 8.
Hardware compensated link gain
Gain= [ G1-A1 (T-T0) ]+ [ G2-A2 (T-T0) ] -ATT_VVA- [ Att-B (T-T0) ] -IL_coupler = G1+G2-ATT_ VVa-ATT-IL_coupler+ (B-A1-A2) x (T-T0) (equation 3)
Wherein G1A1 represents the gain and gain temperature coefficient of the first rf amplifier 202;
g2a2 represents the gain and gain temperature coefficient of the second rf amplifier 204;
att B represents the attenuation amount and the temperature coefficient of the temperature compensation module 203;
att_vva is the attenuation amount of the variable attenuator 201;
il_coupler is the difference of the power divider 205.
As can be seen from equation 3, the relationship between B and A1, A2 is well balanced to eliminate the effect of temperature on the rf link.
As described above, IN the ALC circuit provided IN the embodiment of the present application, the radio frequency signal is input from the IN port, passes through the variable attenuator 201, the temperature compensation module 203, the radio frequency amplifier 202/204 and the power divider 205, and reaches the OUT output end, meanwhile, the power divider 205 couples OUT the radio frequency signal with a certain amplitude according to the preset proportion value of the mode, and sends the radio frequency signal to the detector 206, the detector 206 converts the power amplitude IN the link into the corresponding voltage signal (dB-V), the digital acquisition module ADC207 acquires the converted voltage, and sends the voltage to the digital processing module 208 at the subsequent stage, and the control signal output by the digital processing module 208 after being fitted by the internal algorithm is output after being subjected to digital-analog conversion by the digital-analog conversion module 209, so as to control and adjust the variable attenuator 201, thereby realizing the amplitude stabilizing function.
Referring to FIG. 5, in one embodiment of the present application, the ALC circuit further includes a matching resistor coupled to the power divider. The matching resistor is matched with the power distributor for use.
Referring to fig. 5, in still another embodiment of the present application, the detector further includes a first temperature sensor for acquiring temperature data of the detector, referred to as first temperature data, and the digital acquisition module further includes a second temperature sensor for acquiring temperature data of the digital acquisition module, referred to as second temperature data.
Fig. 6 is a schematic structural diagram of a digital processing module in an ALC circuit according to an embodiment of the present application, referring to fig. 6, the digital processing module includes:
a logarithmic amplifier 301 connected to the digital acquisition module, for performing logarithmic amplification processing on the voltage signal, in fig. 6, the logarithmic amplifier includes a first pre-switch, a second pre-selection switch, a linear amplification unit, a subtractor connected in parallel with the linear amplification unit, and a logarithmic amplification conversion unit, the subtractor being connected in series with the logarithmic amplification conversion unit; and a reference value input unit connected with the subtracter. The first pre-switch and the second pre-switch judge whether the output signal meets the linear amplification link or the logarithmic amplification link, and when the output signal passes through the logarithmic amplification link, the formula is shown as the following formula of y=k (ln (x-A)/B), wherein A is a reference value stored in the reference value input unit, and k and B are coefficients of the logarithmic amplification conversion unit. The linear amplification conversion unit and the logarithmic amplification curve are finally fitted into a linear ideal (amplitude-voltage) curve.
The linear amplifying unit 302 is connected with the logarithmic amplifier and is used for linearly amplifying the voltage signal after logarithmic amplification;
and the integrating unit 303 is connected with the linear amplifying module and is used for performing integral processing on the voltage signal after linear amplifying and sending the voltage signal after integral processing to the post accumulator 305 connected with the loop state control module through the loop state control unit 304 connected with the integrating unit. In the embodiment shown in fig. 6, the integrating unit includes an integrator and a coefficient of variation output unit connected to the integrator. The change coefficient output unit stores a change coefficient, which can be understood as a correspondence relationship between the detection curve and the attenuator attenuation curve. The change coefficient output unit is also connected with a threshold voltage input unit in the later accumulator. The initial value of the change coefficient can be adjusted according to the change of the set reference DAC, so that the ALC loop is quickly stabilized, and the stabilizing time of the loop is prolonged; the stability of the loop is improved, and the ALC failure probability is reduced. The ALC output dynamic is ensured to a certain extent. And adding a conversion coefficient in a reference DAC and preset DAC data chain, and directly fitting the data relation between the attenuation voltage curve of the variable attenuation device and the detection characteristic curve of the detection device. The preset value of the loop is close to the final preset voltage, the integration times are reduced, the stability of the loop is improved, and the stability time of the loop is reduced.
The post accumulator 305 is configured to accumulate a preset voltage, the voltage signal after the integration process, the voltage variation corresponding to the first temperature data and the second temperature data, to obtain an accumulated value.
In a specific embodiment, the post accumulator comprises:
the first temperature compensation conversion unit is used for receiving the first temperature data, determining a first temperature variation according to the first temperature data, and calculating a first voltage variation according to a prestored temperature drift index, detection slope and attenuation slope curve of the detector and combining the first temperature variation;
the second temperature compensation conversion unit is used for receiving the second temperature data, determining a second temperature variation according to the second temperature data, and calculating a second voltage variation according to a pre-stored temperature drift coefficient of the digital acquisition module and combining the second temperature variation;
a preset voltage input unit for storing a preset voltage set in advance;
and the accumulator is respectively connected with the preset voltage input unit, the first temperature compensation conversion unit, the second temperature compensation conversion unit and the loop state control unit and is used for accumulating the preset voltage, the first voltage variation, the second voltage variation and the voltage signals output by the loop state control unit to obtain an accumulated value.
In the actual use process, the initial value of the preset voltage in the preset voltage input unit is a given constant, the initial value can be larger than the preset value difference in the stable state, the number of times of normal loop integration can be larger, the integration time is longer, the situation is worse, the integrated data can be non-ideal because of the arrangement, the loop is uncontrollable, and the controllable interval is smaller. Affecting the loop operating dynamic range.
The first temperature compensation conversion unit is used for correspondingly processing the temperature sensor acquisition data of the detection device unit. The periodic temperature condition of the detection circuit can be detected and calculated through the collected temperature signal data of the detector, the change initial value of the first temperature compensation conversion unit is calculated according to the temperature drift index given by the detector and the detection slope (ALC ON) of the detector/the attenuation slope curve (ALC OFF) of the attenuator, and the change relation of the first temperature compensation conversion unit is further corrected through the amplitude change value of the calibration output port in the temperature drift state. In practical use, the compensation data of the first temperature compensation conversion unit can be adjusted and switched according to the different ALC states. For example, the first temperature sensor has an acquisition data change curve of 200/10 ℃, i.e. the sensor data change by 200 (od) characterizes the temperature change by 10 ℃; the temperature drift coefficient of the detector is 0.08dB/10 ℃, the detection slope (amplitude-detection voltage) of the detector is 50mV/dB, and the control slope (attenuation-control voltage) of the variable attenuator is-40 mV/dB. When the feedback data of the temperature sensor changes 200, the ambient temperature of the corresponding detector changes by 10 ℃, under the ALC ON state, according to the temperature drift coefficient of the detector, the detection amplitude changes by 0.08dB, and when the corresponding amplitude changes by 0.08dB, the reference voltage of the detector needs to be adjusted by 0.08dB by 50 mV/dB=4 mV, so that the accuracy of the detection amplitude can be ensured; by calibrating the output amplitude change delta AdB, the power to be compensated of the link is AdB, and the amplitude of the output port of the unit circuit can be ensured to be accurate by correcting the first temperature compensation conversion unit to be (4+50A) mV. In the ALCOFF state, the amplitude of the output port of the unit circuit can be ensured to be accurate by adjusting (-40A) mV according to the change of the calibration output amplitude to delta AdB and the control slope of the variable attenuator.
The second temperature compensation conversion unit compensates the temperature sensing device of the ADC device of the digital acquisition module to acquire data. And calculating the temperature change of the ADC device according to the change of the feedback data of the sensor, and calculating the voltage offset of the sampling data according to the temperature drift coefficient of the ADC device to obtain a change formula of the second temperature compensation conversion unit. This transformation relationship is not affected by the ALC state switching. And the compensation curve is adjusted and corrected according to the temperature change coefficient of the device. The conventional digital temperature compensation section is processed at the input of the integrator unit 303, which is not able to compensate the effect of link temperature variations on the output amplitude after long operation. The scheme can meet the requirement of compensating the temperature influence of the links in different states of ALC ON and ALC OFF in real time.
And the voltage conversion module 306 is connected with the post accumulator and is used for carrying out voltage change on the accumulated value to obtain a control signal.
The ADC sampling data is processed by the logarithmic amplifier 301 and output to the linear amplifying module 302, converted into data consistent with the reference DAC data format, output to the post-accumulator 305 through the integrating unit 303 (the output of which is regulated to be accumulated in one direction according to a certain rate when the integral input difference (the operational amplifier input end v+noteqv-) is not zero), the first temperature compensation conversion unit correspondingly compensates the temperature drift coefficient of the detector device, the second temperature compensation conversion unit correspondingly compensates the temperature drift coefficient of the ADC device, and finally output through the voltage conversion unit 306 to control the DAC device to control the variable attenuator. Module 304 is a loop control state unit.
In summary, the application provides an ALC circuit and a radio frequency signal source, which are used for compensating the temperature under different conditions, wherein a temperature compensation module is added in a hardware circuit to reduce the influence of the temperature on the gain of a radio frequency link; temperature sensors are added around the detector and the digital acquisition module to monitor the temperature, errors caused by the temperature are compensated in real time through the temperature characteristics of the device, the design of the digital temperature compensation part is optimized, the calibration time is saved, the production efficiency is improved, the influence of the temperature amplitude of a loop in an ALC OFF state is reduced, the loop locking time is reduced, the stability of the loop is improved, the data calibration work of the temperature compensation link is reduced, the amplitude stability in the ALC OFF state is improved, the technical index of the system is improved, and the performance is optimized.
Furthermore, although several unit modules of the system are mentioned in the above detailed description, such a division is not mandatory only. Indeed, the features and functions of two or more of the elements described above may be embodied in one element in accordance with embodiments of the present application. Also, the features and functions of one unit described above may be further divided into a plurality of units to be embodied. The terms "module" and "unit" as used above may be software and/or hardware that implements the intended function. While the modules described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.
Improvements to one technology can clearly distinguish between improvements in hardware (e.g., improvements to circuit structures such as diodes, transistors, switches, etc.) and software (improvements to the process flow). However, with the development of technology, many improvements of the current method flows can be regarded as direct improvements of hardware circuit structures. Designers almost always obtain corresponding hardware circuit structures by programming improved method flows into hardware circuits. Therefore, an improvement of a method flow cannot be said to be realized by a hardware entity module. For example, a programmable logic device (Programmable Logic Device, PLD) (e.g., field programmable gate array (Field Programmable Gate Array, FPGA)) is an integrated circuit whose logic function is determined by the programming of the device by a user. A designer programs to "integrate" a digital system onto a PLD without requiring the chip manufacturer to design and fabricate application-specific integrated circuit chips. Moreover, nowadays, instead of manually manufacturing integrated circuit chips, such programming is mostly implemented with "logic compiler" software, which is similar to the software compiler used in program development and writing, and the original code before the compiling is also written in a specific programming language, which is called hardware description language (Hardware Description Language, HDL), but HDL is not only one, but a plurality of kinds, such as ABEL (Advanced Boolean Expression Language), AHDL (Altera Hardware Description Language), confluence, CUPL (Cornell University Programming Language), HDCal, JHDL (Java Hardware Description Language), lava, lola, myHDL, PALASM, RHDL (Ruby Hardware Description Language), etc., VHDL (Very-High-Speed Integrated Circuit Hardware Description Language) and Verilog2 are most commonly used at present. It will also be apparent to those skilled in the art that a hardware circuit implementing the logic method flow can be readily obtained by merely slightly programming the method flow into an integrated circuit using several of the hardware description languages described above.
The controller may be implemented in any suitable manner, for example, the controller may take the form of, for example, a microprocessor or processor and a computer readable medium storing computer readable program code (e.g., software or firmware) executable by the (micro) processor, logic gates, switches, application specific integrated circuits (Application Specific Integrated Circuit, ASIC), programmable logic controllers, and embedded microcontrollers, examples of which include, but are not limited to, the following microcontrollers: ARC625D, atmel AT91SAM, microchip PIC18F26K20, and Silicone Labs C8051F320, the memory controller may also be implemented as part of the control logic of the memory.
Those skilled in the art will also appreciate that, in addition to implementing the controller in a pure computer readable program code, it is well possible to implement the same functionality by logically programming the method steps such that the controller is in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers, etc. Such a controller may thus be regarded as a kind of hardware component, and means for performing various functions included therein may also be regarded as structures within the hardware component. Or even means for achieving the various functions may be regarded as either software modules implementing the methods or structures within hardware components.
For convenience of description, the above devices are described as being functionally divided into various units, respectively. Of course, the functions of each element may be implemented in the same piece or pieces of software and/or hardware when implementing the present application.
From the above description of embodiments, it will be apparent to those skilled in the art that the present application may be implemented in software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer system (which may be a personal computer, a server, or a network system, etc.) to execute the method described in the embodiments or some parts of the embodiments of the present application.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.
The application is operational with numerous general purpose or special purpose computer system environments or configurations. For example: personal computers, server computers, hand-held or portable systems, tablet systems, multiprocessor systems, microprocessor-based systems, set top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, distributed computing environments that include any of the above systems or systems, and the like.
The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing systems that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage systems.
Although the present application has been described by way of examples, one of ordinary skill in the art appreciates that there are many variations and modifications that do not depart from the spirit of the application, and it is intended that the appended claims encompass such variations and modifications as fall within the spirit of the application.
Claims (7)
1. An ALC circuit, wherein the ALC circuit includes an input port, a radio frequency link coupled to the input port, a feedback loop coupled to the radio frequency link, and an output port;
the input port is used for inputting a radio frequency signal;
the radio frequency link comprises:
the variable attenuator is connected with the input port and used for carrying out attenuation treatment on the radio frequency signals;
the first radio frequency amplifier is connected with the variable attenuator and is used for amplifying the radio frequency signal after attenuation treatment;
the temperature compensation module is connected with the first radio frequency amplifier and is used for performing temperature compensation on the amplified radio frequency signals;
the second radio frequency amplifier is connected with the temperature compensation module and is used for amplifying the radio frequency signal after temperature compensation;
the power distributor is connected with the second radio frequency amplifier and is used for outputting the amplified radio frequency signal through the output port and outputting a coupling radio frequency signal according to a preset ratio value;
the feedback loop includes: the detector is connected with the power distributor and used for converting the coupled radio frequency signals into corresponding voltage signals; the digital acquisition module is connected with the detector and is used for acquiring the voltage signal; the digital processing module is connected with the digital acquisition module and is used for fitting and outputting a control signal according to the voltage signal; the digital-to-analog conversion module is connected with the digital processing module and is used for performing digital-to-analog conversion on the control signal and outputting the control signal to the variable attenuator so as to control the variable attenuator;
the detector also comprises a first temperature sensor, which is used for collecting temperature data of the detector, namely first temperature data; the digital acquisition module further comprises a second temperature sensor for acquiring temperature data of the digital acquisition module, which is called second temperature data; the digital processing module comprises: the logarithmic amplifier is connected with the digital acquisition module and is used for carrying out logarithmic amplification processing on the voltage signal; the linear amplification module is connected with the logarithmic amplifier and is used for carrying out linear amplification on the voltage signal after logarithmic amplification processing; the integrating unit is connected with the linear amplifying module and is used for carrying out integral processing on the voltage signal after linear amplifying and sending the voltage signal after integral processing to a rear-stage accumulator connected with the loop state control unit through the loop state control unit connected with the integrating unit; the post accumulator is used for accumulating preset voltage, the voltage signal after the integration processing, the voltage variation corresponding to the first temperature data and the second temperature data to obtain an accumulated value; and the voltage conversion unit is connected with the rear-stage accumulator and is used for carrying out voltage change on the accumulated value to obtain a control signal.
2. The ALC circuit of claim 1, wherein the temperature compensation module is a temperature compensated attenuator or a pi-net attenuator constructed using a reverse thermistor.
3. The ALC circuit of claim 1, further comprising a matching resistor coupled to the power divider.
4. The ALC circuit of claim 1, wherein the logarithmic amplifier comprises:
a first pre-switch;
a second pre-selection switch;
a linear amplifying unit;
the subtracter is connected with the linear amplifying unit in parallel and the logarithmic amplifying and converting unit is connected with the logarithmic amplifying and converting unit in series;
and a reference value input unit connected with the subtracter.
5. The ALC circuit of claim 1, wherein the integration unit includes an integrator and a coefficient of variation output unit coupled to the integrator.
6. The ALC circuit of claim 1, wherein the post-stage accumulator comprises:
the first temperature compensation conversion unit is used for receiving the first temperature data, determining a first temperature variation according to the first temperature data, and calculating a first voltage variation according to a prestored temperature drift index, detection slope and attenuation slope curve of the detector and combining the first temperature variation;
the second temperature compensation conversion unit is used for receiving the second temperature data, determining a second temperature variation according to the second temperature data, and calculating a second voltage variation according to a pre-stored temperature drift coefficient of the digital acquisition module and combining the second temperature variation;
a preset voltage input unit for storing a preset voltage set in advance;
and the accumulator is respectively connected with the preset voltage input unit, the first temperature compensation conversion unit, the second temperature compensation conversion unit and the loop state control unit and is used for accumulating the preset voltage, the first voltage variation, the second voltage variation and the voltage signals output by the loop state control unit to obtain an accumulated value.
7. A radio frequency signal source, characterized in that the radio frequency signal source comprises a radio frequency signal source body and an ALC circuit according to any one of claims 1 to 6.
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| CN110311633A (en) * | 2019-07-08 | 2019-10-08 | 成都锐芯盛通电子科技有限公司 | Millimeter wave broadband detection warm linearity autocompensation installation and its method entirely |
| CN110543205A (en) * | 2019-08-07 | 2019-12-06 | 中电科仪器仪表有限公司 | method for improving dynamic range of vector network analyzer source under wide temperature condition |
| CN111884601A (en) * | 2020-08-05 | 2020-11-03 | 星识通南京通信科技有限公司 | Broadband precise temperature-adjustable complementary amplifier and broadband precise temperature compensation method |
| CN113098548B (en) * | 2021-04-09 | 2022-11-29 | 波达通信设备（广州）有限公司 | Transmitting link, transmitting link calibration method, device and digital transceiver |
| CN113504742B (en) * | 2021-06-15 | 2022-07-26 | 电子科技大学 | Double-fed automatic level control system based on FPGA |
| CN114527699A (en) * | 2022-02-25 | 2022-05-24 | 普源精电科技股份有限公司 | Control method and device of radio frequency signal, programmable device and storage medium |
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