英语翻译数据的采样和保持当某一通道进行A/D转换时,由于A/D转换需要一定的时间,为了保证A/D转换的精度,必须在A/D

The sample of the data and keep
When the some passage carries on the conversion of A/ D,because the A/ D conversion needs certain time,for the sake of the assurance the A/ D turn
Accuracy of change,must at the A/ D convert keep and should be worth constantly.In consideration of biggest sample time that conversion time and systems of the A/ D conversion allow,in the A/ D before convert use the sample/ hold circuit,
Sample/ the hold circuit has sample and keeps two work appearances,being subjected to the numerical signal value control that the way control carry.When the way control carries to input the signal to"0"( the low electricity is even),the switch K shuts to match,sample/ the hold circuit is placed in to sample the appearance,the operation enlarger A1 refreshes for the electric capacity C after output the electric current was flow by the electric resistance R limit,the Vout also will follow behind the Vin variety but varietieses; be the way control to carry to input the signal electricity even is even for high electricity"1",the electronics switch K open,the sample/ hold circuit constitute by R and C is placed in to" keep" the appearance,outputting to carry the even value of the electricity that the Vout keeps the Vin to open in the K.The value of the electric capacity C is to the accuracy influence that sample keep rather big.The electric capacity C chooses over the conference to affect the VouT to the V} of follow behind the characteristic,lead small will make the VouT take place the variety during the period of keep.Therefore,the adoption operates the enlarger A1 and A2s in the electric circuit,to raise to input the resistance and let up the exportation resistance.