The invention discloses a system and method for testing power stability of a highly stable radiofrequency signal. The system includes a directional coupler, an attenuator set, a microwave power meter, an upper computer, a high precision digital universal meter and a diode detector. The directional coupler is successively in serial connection to the attenuator set and the microwave power. The upper computer conducts system application measurement and control respectively on the microwave power meter and the high precision digital universal meter. A coupling end of the directional coupler is connected to the diode detector. The diode detector is in connection to the high precision digital universal meter and is a gallium arsenide diode detector. According to the invention, the system and the method have the following benefits: through the testing of stability of demodulation voltage, the evaluation object in testing the power stability of the radiofrequency signal is synchronously acquired in a non-distortion manner, and a constant temperature chamber and a gallium arsenide device are configured to reduce the influence on the demodulation voltage by temperature changes to the minimum with the proviso that the power of the input radiofrequency signal stays unchanged.

System and method for testing power stability of highly stable radiofrequency signal

The invention belongs to the field of microwave solid state power amplifiers, and provides an automatic calibration method for a solid-state power amplifier based on a genetic algorithm, wherein the method comprises the steps of power automatic measurement and power error correction. The method comprises the following steps of constructing an error correction value function f (p) in the process of power error correction and using the genetic algorithm to perform optimal value calculation on f (p) to obtain a minimum f (p) value and a maximum f (p) value; and performing mean value calculation on the optimized minimum f (p) value and maximum f (p) value to obtain a final power error correction value F (P). When power error correction is performed in a conventional calibration method, the power error correction is only tested once at the specific power value of a corresponding frequency point or after several power points are tested, a mean value is taken to obtain the final power error correction value; the operations are mostly done manually. Therefore, the automatic calibration method for the solid-state power amplifier provided by the invention can greatly reduce the occasionality of obtaining an error correction value, and improve the calibration efficiency and calibration accuracy, and has very strong universality and a practical engineering value.

Automatic calibration method for solid-state power amplifier

The invention discloses a method for improving the source dynamic range of a vector network analyzer under a wide temperature condition, and particularly relates to the technical field of measurementof gain compression of a microwave amplifier by the vector network analyzer. According to the method, adjustment is performed based on an automatic level control circuit; source output power is detected through a detector tube; and after an output voltage of the detector tube is compensated and amplified by a double-slope logarithmic amplification circuit having a temperature compensation circuitand a digital compensation circuit, the output voltage is added with a calibration voltage generated by a main power calibration circuit with a temperature compensation circuit part, and the summed voltage signal is subjected to integral amplification, so that the attenuation of an electrically controlled attenuator is adjusted to control the magnitude of the source output power. By adding the temperature compensation circuits to the main power calibration circuit and the double-slope logarithm amplification circuit of the automatic level control technology, the influence of temperature changeon the source output power is reduced, and the dynamic range of the source power is increased.

Method for improving source dynamic range of vector network analyzer under wide temperature condition

The invention discloses a signal power characteristic compensation method and device based on a vector network analyzer. The method comprises acquiring the uncompensated power value of each frequencypoint, calculating a required DAC value for compensating the uncompensated power value to the set power, adjusting the power according to the DAC value, and storing the DAC value in a memory; according to the current frequency and the step frequency, obtaining the storage location of the DAC value required for the compensation of the current frequency, reading the DAC value from the memory, and outputting the DAC value to a compensation circuit for power compensation. The method shortens the calculation time and improves the scanning speed by saving the compensation data in the hardware and achieving the power compensation function through the hardware, calibrates a point per 16MHz, calls the compensation data from the memory directly when a scanning point falls within the range, and improves the accuracy of compensation by increasing the number of calibration points.

Signal power characteristic compensation method and device based on vector network analyzer

The invention provides an automatic level control circuit. The automatic level control circuit includes a coupling unit, a constant temperature detection unit, a sampling quantification unit, an operation processing unit, a PIN drive unit, and a PIN attenuation unit; the operation processing unit includes a logarithm transformation module, a power reference module, an error comparison module, a digital integration module, and an exponential transformation module; the coupling unit couples a main circuit signal into a coupled signal according to a proportion, the coupled signal is sent to the operation processing unit via the constant temperature detection unit and the sampling quantification unit, a processing result is output to the PIN drive unit, and the PIN drive unit finally controls the PIN attenuation unit in the main circuit, so that the power level of the main circuit signal can be automatically controlled. Through a digital ALC design and a constant temperature detection method, the influence of environment temperature changes on the detection sensitivity can be eliminated, so that the stability of the signal source output power can be greatly improved.

Digital automatic level control circuit having constant temperature detection function and digital automatic level control method

The invention provides an automatic power linearity calibration method based on a signal generator. The automatic power linearity calibration method includes setting a group of power parameters in the signal generator, searching relations of DAC (digital to analog conversion) corresponding to different power test points when an ALC (automatic level control) loop operates in a closed state, calibrating the power of the current frequency point in real time by an external power meter, and automatically debugging power linearity indexes to the optimal states. By the automatic power linearity calibration method, debugging cost of producers can be reduced, calibration efficiency is improved, and implementation cost of engineering instruments is reduced. When the instruments need power linearity calibration on a user site, automatic calibration is executed by one key, users can calibrate skillfully by being simply trained only, personnel dispatched from manufacturers for on-site debugging is omitted and maintenance cost of the instruments can be effectively reduced. By the automatic power linearity calibration method, real-time accuracy in calibration is improved, and calibration process is automatic; when the environment changes, accuracy can be conveniently improved by recalibration.

Automatic power linearity calibration method based on signal generator

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Digital automatic level control circuit having constant temperature detection function and digital automatic level control method

Automatic power linearity calibration method based on signal generator