A Frequency Response Compensation Method for Agile Frequency Signals Based on Electrically Adjustable Attenuators

Abstract

The invention provides a frequency agile signal frequency response compensation method based on an electrically controlled attenuator, the method including a first step of conducting calibration in a single source whole machine full-band and full-power range according to corresponding frequency and power, and establishing a two-dimensional frequency agile signal frequency response calibration array; a second step of storing calibration data into a corresponding storage area of the frequency agile signal frequency response calibration array at start-up based on indexes of the frequency and power; a third step of using a master controller, when the frequency or power of a frequency agile signal changes, to take out the corresponding calibration data from the storage area of the two-dimensional frequency agile signal frequency response calibration array according to the changed frequency; and a fourth step of calculating current corresponding frequency response compensation data according to the calibration data, transmitting the frequency response compensation data into the electrically controlled attenuator through digital-to-analogue conversion, and conducting frequency response compensation of frequency and power points for the frequency agile signal. The method provided by the invention enables the frequency response compensation all-channel response time of a circuit to be up to a magnitude of 10 nanoseconds.

Description

technical field [0001] The invention belongs to the technical field of testing, and in particular relates to a method for compensating the frequency response of an agile frequency signal based on an electronically adjustable attenuator. Background technique [0002] In the field of test technology, there are generally two methods of power control: automatic level control (Auto Level Control, namely ALC) and direct power control. Automatic level control is a closed-loop power control method. Generally, a negative feedback loop is used to automatically adjust the signal power within a certain range to keep it consistent with the preset reference power level, thereby ensuring the accuracy of the signal power. ,Stablize. The direct power control is an open-loop power control method, generally using a modulating amplifier or an electronically adjustable attenuator to directly change the power of the output signal. The circuit response time of the closed-loop power control metho...

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Problems solved by technology

[0005] However, the existing open-loop power control method based on a modulating amplifier has a disadvantage of slow response speed. Due to the sampling time and integration time of the modulator, the response time is usually on the order of 500 nanoseconds to 2 microseconds, and the corresponding frequency The response compensation time is also on the order of microseconds. Such a response speed obviously cannot meet the control requirements for the generation of agile frequency signals on the order of 10 nanoseconds.

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