自去年起，这家商店就开始给家有老式电视、需要数字模拟转换盒的人提供优惠券。
Since last year, this store has offered coupons to people who need digital analog converter boxes for their older TVs.
因此，电流镜(100)的每个晶体管限定数字模拟转换电路的步，相邻步之间的比率实质上是常数。
Thus, each transistor of the current mirror (100) defines a step of the digital to analog conversion circuit, and the ratio between adjacent steps is substantially constant.
遥测数字模拟信息转换器TAD ？
遥测数字模拟信息转换器TAD ？
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