Finally, the HD formats of digital TV have a different aspect ratio than analog TVs. An analog TV has a 4:3 aspect ratio, meaning that the screen is 4 units wide and 3 units high.
最后，高清格式(16：9)具有和模拟电视(4：3)不同的宽高比。
2
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.
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。
3
It is thus possible to provide an improved analog to digital converter having an improved signal to noise ratio whilst substantially maintaining conversion throughput.