A method of digitally controlling the full-bias output current of a digital-to-analog converter

Abstract

The invention relates to a method for digitally controlling full deflection output current of a digital analog converter. The method includes the steps that firstly, preliminary reference current is generated through an initial reference current generating circuit; secondly, the magnitude of the full deflection output current is determined according to application, the magnitude of the reference current is changed by changing input code words of a current type digital analog converter, and then the magnitude of the full deflection current of the whole digital analog converter is changed; thirdly, the generated reference current is input to a biasing circuit, and then biasing voltage is generated. The problem of inaccurate arrangement when the full deflection current of an emission digital analog converter is adjusted is solved, flexibility for controlling the full deflection output current is greatly improved, and stability of the full deflection output current is improved; the full deflection current of the digital analog converter is adjusted, then the full deflection output current can reach 8.7mA to 31.3 mA, and the range and accuracy of the full deflection output current are greatly expanded and improved respectively.

Description

technical field [0001] The invention relates to a method for digitally controlling the full-bias output current of a digital-to-analog converter, belonging to the technical field of digital-to-analog converters. Background technique [0002] The output full-bias current of the transmitting digital-to-analog converter used in military equipment such as wireless communication equipment and radar is an important indicator to measure the output power of the transmitter. The full bias current setting varies from application to application. The output current of traditional digital-to-analog converters is generally fixed at 20mA. When the output power is required to change, it cannot be changed flexibly according to the application situation. [0003] In a general transmitting digital-to-analog converter, the setting of the full-bias output current is set through an external resistor. According to different applications, different resistors are set to determine different full-bia...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, and to provide a method for digitally controlling the full-bias output current of a digital-to-analog converter, which solves the problem of inaccurate settings in the process of adjusting the full-bias current of the transmitting digital-to-analog converter, It solves the problem of how to change the full-bias output current through digital control, and greatly improves the flexibility of full-bias output current control. By adjusting the full-bias current to adjust the digital-to-analog converter, the full-bias output current can reach 8.7mA~31.3mA , greatly improving the full-bias output current range and current accuracy

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