公开(公告)号：US12250002B2

公开(公告)日：2025-03-11

申请号：US18127262

申请日：2023-03-28

Applicant: UNITED MICROELECTRONICS CORP.

Inventor： Po-Hua Chen ,  Yu-Yee Liow ,  Chih-Wei Wu ,  Wen-Hong Hsu ,  Hsuan-Chih Yeh ,  Pei-Wen Sun

IPC: H03M1/46

Abstract: A SAR ADC includes: a sample-hold (S/H) circuit sampling an input voltage to generate a S/H output signal; a DAC generating a DAC output signal; a comparator comparing the DAC output signal with the S/H output signal to generate a comparison output signal; a SAR combinational digital circuit group; a multiplexer circuit; and a plurality of registers for registering the comparison output signal as register output signals and outputting as an output signal of the SAR ADC. The SAR combinational digital circuit group generates a plurality of first and second SAR output signals based on the register output signals. The multiplexer circuit is controlled by on the register output signals to select among the first and the second SAR output signals as a plurality of multiplexer output signals for sending to the DAC. A capacitor coupling relationship of the DAC is controlled by the multiplexer output signals.