Power supply circuit of ADC (Analog to Digital Converter) and spectrum analyzer

Abstract

The application provides a power supply circuit of an ADC (Analog to Digital Converter) and a spectrum analyzer. The power supply circuit of the ADC (Analog to Digital Converter) is suitable for a digital-analog hybrid circuit board and at least comprises a first direct current converter, a second direct current converter, a first linear voltage stabilizer, a second linear voltage stabilizer and athird linear voltage stabilizer; the first direct current converter, the second direct current converter and the first linear voltage stabilizer are arranged in a power source partition; the second linear voltage stabilizer is arranged in an analog circuit partition; the third linear voltage stabilizer is disposed in a digital circuit partition; a voltage supplied by a power source is subjected to two-stage voltage reduction of the first direct current converter and the third direct current converter so as to be decreased to a power supply voltage of the digital power source end of the ADC; and the voltage supplied by the power source is subjected to three-stage voltage reduction of the second direct current converter, the first linear voltage stabilizer and the second direct current converter so as to be decreased to a power supply voltage of the analog power source end of the ADC. With the power supply circuit of the ADC (Analog to Digital Converter) and the spectrum analyzer of theinvention adopted, low-frequency noises from the power source or coupled along a line can be reduced.

Description

technical field [0001] The application belongs to the field of power supply, and in particular relates to an ADC power supply circuit and a spectrum analyzer. Background technique [0002] In the prior art, a spectrum analyzer includes a signal input circuit, an ADC (Analog to Digital Converter, analog-to-digital converter), a digital processing circuit, a user input module, a spectrum display module, and a power supply circuit. The performance of the ADC plays an important role in the quantitative analysis of digital signals. Therefore, the design of the ADC circuit part directly affects the signal processing after digitization in the later stage. The noise generated by the ADC will be superimposed on the input signal by its own sampling, and cannot be eliminated in the digital signal processing circuit, resulting in errors in the calculation results. [0003] In the spectrum analyzer in the prior art, the digital power supply terminal and the analog power supply terminal ...

AI Technical Summary

Problems solved by technology

[0004] This application provides an ADC power supply circuit and a spectrum analyzer, which are used to solve the problem that the ADC power supply in the digital-analog hybrid circuit board is not subjected to noise reduction processing in the prior art, and noise is easily introduced through the power supply, resulting in inaccurate subsequent calculations. exact question

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