Input impedance boosting device with robustness to parasitic components

The invention relates to an input impedance boosting device. The input impedance boosting device comprises an analog-to-digital conversion circuit; an input capacitor connected to an input terminal of the analog-to-digital conversion circuit and a ground line, and having a first shield metal formed on a lower portion thereof; a feedback capacitor, which is connected to a positive feedback loop of the analog-to-digital conversion circuit, and which has a second shield metal formed on the lower portion thereof; and an impedance boosting part connected to both ends of the feedback capacitor and boosting the input impedance based on a first parasitic component formed between the input capacitor and the first shield metal and a second parasitic component formed between the feedback capacitor and the second shield metal. 本发明涉及输入阻抗提升装置，输入阻抗提升装置包括：模拟数字转换电路；输入电容器，与模拟数字转换电路的输入端及接地线相连接，在下部形成有第一屏蔽金属；反馈电容器，与模拟数字转换电路的正反馈回路(positive feedback loop)相连接，在下部形成有第二屏蔽金属；以及阻抗提升部，与反馈电容器的两端相连接，基于形成在输入电容器与第一屏蔽金属之间的第一寄生成分及形成在反馈电容器与第二屏蔽