| 摘要 |
An analogue to digital converter ("ADC") has a plurality of electrically interconnected semiconductor layers (3, 7, 9, 11) arranged in a stack. Each layer has an input for an analogue signal on one layer and an output for a digital signal on another layer. The conversion of the input signal to the output signal is performed in a plurality of steps which are divided between the respective layers. Each layer comprises a silicon wafer with CMOS circuitry formed thereon and conductive via (16, 17, 18) are provided through the semiconductor layers. The ADC is of pipeline configuration; at least one bit is extracted from the analogue input signal in each of the plurality of layers. |
