Research On The Testing Of Analog-to-Digital Conventer

High speed A/D is widely used in wireless communication, braking control, automatic detection, etc. How to evaluate accurately the performance of high speed A/D by high attention. To be exact test of high-speed A\D test environment and hardware requirements is very strict. The traditional test theory and test methods are not suitable for spending increased dramatically, test. In analog and mixed-signal circuit domain, because circuit forms and processing signal, the uniqueness test theory is relatively backward, testing more difficult. Especially at present, SOC system design and deep submicron process has brought new problems, test are gradually become the bottleneck, the test engineer design to spend more energy to how to reduce test cost.This article USES yards density analysis method and FFT spectrum histogram method to test high-speed A\D performance, and based on terry reaches the company's large automatic test system (J750) realized AD7891 parameter test. High-speed Due to the high speed A/D evaluation parameter many, this paper analyzes the error, error, gain imbalance lost yards, differential non-linear (DNL), integral nonlinear, signal-to-noise ratio (SNR), total wave distortion (THD), no stray dynamic range (SFDR) and other parameters of the test. Papers on several aspects below made beneficial exploration:First, based on the A/D ATE the hardware and software of the test framework, ATE the role of each module;Second, coherent sampling of the basic theory and coherent sampling in the realization way ATE;Third, use slope, yards for A\ D density histogram of static tests and testing process test methods;Fourth, the method of using FFT spectrum analysis of signal. Dynamic testing is the key to the integrity of the collected signal sampling, coherent realized to the input signal because the whole cycle sampling, so as to ensure the integrity of the collected signal, A/D testing must satisfy the coherent sampling conditions. Along with the A/D sampling speed, the resolution of the conditions improve, coherent sampling, difficult to meet the test system hardware and software requirements are demanding. So test technology improvements are often need to test the system performance improvement. Paper introduces testing A/D test theory, testing method and based on the testing machine (ATE) A/D test implementation. Finally, it presents results.