Precise numerical control attenuator applying voltage-controlled attenuator and calibration method

Abstract

The invention discloses a precision numerical control attenuator applying a voltage-controlled attenuator and a calibration method; the precision numerical control attenuator comprises an MCU which is used for receiving an instruction of an upper computer and adjusting data outputted by the MCU to a DA conversion chip; a DA conversion unit which is used for converting a direct current signal and is connected with the MCU; a voltage-controlled attenuator which is used for attenuating radio frequency signals and is connected with the DA conversion unit; a memory which is used for storing calibration data and is connected with the MCU; a serial port or the USB interface which is used for external equipment to realize data input in the MCU and is connected with the MCU; and a working power supply which is used for providing electric energy required by attenuation and control. According to the technical scheme, the data output to the DA conversion chip by the MCU and the direct current signal converted by the DA chip are adjusted according to the instruction of the upper computer and reach the control pin of the voltage-controlled attenuator, so that the precise control of attenuation is realized, complex circuit cooperation is not needed, the precise control of the attenuator is directly realized through the MCU after calibration, the optimization effect is good, and the improvement cost is low.

Description

technical field [0001] The invention relates to the technical field of attenuators, in particular to a precision numerical control attenuator using a voltage-controlled attenuator and a calibration method. Background technique [0002] Voltage-controlled attenuator, a device that controls microwave signal attenuation by applying voltage to the PIN tube pin to adjust the conduction degree of the PIN tube, is mainly used in ALC control occasions, and cooperates with negative feedback to realize the function of signal strength control. The main function of the attenuator is to control the amplitude of the signal, and the N-bit digital control attenuator has 2N amplitude control states. As an important amplitude control circuit in radio frequency chips, attenuators are widely used in various phased array systems. In order to meet the performance index of the phased array system, the attenuator generally needs to meet the following basic requirements: First, it needs high attenu...

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly solves the technical problem that the precision of the attenuator in the original technical solution is low and it is difficult to meet the control requirements, and provides a precision numerically controlled attenuator and a calibration method using a voltage-controlled attenuator. According to the instructions of the host computer, the MCU output is adjusted to The data of the DA conversion chip, the DC signal converted by the DA chip, reaches the control pin of the voltage-controlled attenuator, and the precise control of the attenuation is realized without complex circuit cooperation. After calibration, the attenuator is directly controlled by the MCU to optimize the effect. Good and low cost to improve

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