This paper elaborates a heating charging system controlled by single-chip microprocessor,which collects and trannsfers data with A/D conversion and frequency-divided technology,sends the final data processed by the single-chip microprocessor to the screen by the 8D flip flop.

The principle of DC Speed Regulating Device with thyristor,in conjunction with the characteristics of capturation,comparation and A/D converter of PIC16F874 microcontroller which belongs to of Microchip CO.

AD7859 is a 12-bit ADC,which features high speed,low power and 200ks/s smapling frequency.

Cause of inter-channel influence in ADC system and its countermeasures;

The Research of ADC Combination Based on CPLD;

Research of bits gliding pipeline A/D converterapplied to parallel ADC;

They conduce to the practical A/D conversion system design .

In this paper, the functions, specialties and work principle of the AD977A are introduced, and a simple and useful method is presented to implement the A/D conversion with AD977A and CPLD.

This article presents an sub-nyquist sampling method for A/D conversion of the bandpass signals,using the Remainder Theorem,and takes an example of A/D conversion to illustrate the solution,and gives some conclusions.