External synchronizer for continuous equal-gap sampling of sigma-delta type AD

The invention discloses an external synchronization device for continuous equal-gap sampling of a sigma-delta type AD. An external synchronous intermittent sampling clock is used as a working clock ofa sigma-delta type AD; the number of clock pulses between two synchronization signals is strictly consistent; the clock pulse number is equal to the clock pulse number required by one-time sampling;in this way, the sigma-delta type AD is reset only once by using the starting signal; each sampling can be synchronized with the synchronization signal, the digital filter does not need to be reset again, and compared with a continuous sampling non-reset digital filter, the sampling noise is greatly reduced and the sampling precision is improved in comparison with a traditional device by utilizingdata which can be utilized by the digital filter within the equal sampling time. 本发明公开了一种Σ-Δ型AD的连续等间隙采样的外同步装置，通过采用外同步间歇采样时钟作为Σ-Δ型AD的工作时钟，在两次同步信号之间的时钟脉冲个数严格一致，等于一次采样所需要的时钟脉冲数，这样只需要利用启动信号复位一次Σ-Δ型AD后，以后每次的采样都能与同步信号同步，无需再复位数字滤波器，等