⚡ 本页包含 AI 生成的分析内容，仅供参考
该论文提出了一种18位、12.5MHz采样率的逐次逼近ADC，实现了93dB的信噪比。通过增加开关实现自动调零，将第一级放大器的偏移和1/f噪声存储在级间电容上，并采用两级SAR架构（第一级确定10位，第二级输出9位范围）以放宽放大器增益和线性度要求，主要面向医疗成像应用。
21.1.3. To allow auto-zeroing of offset and 1/f noise, additional switches are added to allow the amplified offset and 1/f noise of the first stage to be stored on the inter-stage capacitors C1 and C2. Since a full ten bits are determined within ADC1, the full scale range at the RA output is only 9 bits (allowing 1 bit of overlap across the RA). This considerably eases the gain and linearity requirements of this amplifier. 2 This ADC is aimed at medical imaging such as digital x-ray where multiple channels from a photodiode array are multiplexed to a number of ADCs. These ADCs need to have a dynamic range in excess of 90dB to cater for the distance and composition of tissues that the x-rays have passed through. INL matching between converters of about 1 LSB at the 16b level is also required to avoid visible artifacts across pixel boundaries. These INL and dynamic rang
Chistopher Peter Hurrell1, Colin Lyden2, David Laing1,
Derek Hummerston1, Mark Vickery1 1 Analog Devices, Newbury, United Kingdom, Analog Devices, Cork, Ireland shown in Fig