The invention discloses an
assembly line successive approximation type analog-
digital converter self-calibration method and device. The
assembly line successive approximation type analog-
digital converter self-calibration device comprises a first-stage successive approximation type analog-
digital converter, a second-stage successive approximation type analog-digital converter, an
operational amplifier and a digital calibration control
logical circuit, wherein the first-stage successive approximation type analog-digital converter is used for completing data collection and analog-
digital conversion on input signals, a pseudo random quantity with a known digital quantity is exerted on the first-stage successive approximation type analog-digital converter, the
operational amplifier is used for amplifying remnant signals output by the first-stage successive approximation type analog-digital converter and transmitting the remnant signals to the second-stage successive approximation type analog-digital converter to conduct analog-
digital conversion, and the digital calibration control
logical circuit is used for conducting circulation calibration according to output and the pseudo random quantity of the first-stage successive approximation type analog-digital converter and the second-stage successive approximation type analog-digital converter to control gains of the
operational amplifier, and obtaining data output. By means of the mode, the gains of the operational
amplifier can be adjusted in real time, influences of factors such as the temperature and the supply
voltage on the gains can be calibrated, and the effective accuracy of an ADC is accordingly improved.