Patent ID: 11876528
Assignee: TSINGHUA UNIVERSITY
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 24:
25. The analog-to-digital conversion circuit according to claim 22, wherein the analog-to-digital conversion circuit further comprises a shared conversion module configured to convert quantized margin signals of the first analog signals of N channels,
the shared conversion module includes a positive shared conversion unit and a negative shared conversion unit, the positive shared conversion unit including V second shared capacitors connected in parallel and V sets of second shared switches, and the negative shared conversion unit including V third shared capacitors connected in parallel and V sets of third shared switches, wherein V is an integer greater than or equal to 1,
the positive shared conversion unit is connected to the N positive sampling and conversion units and the first input terminal of the comparator respectively, and the negative shared conversion unit is connected to the N negative sampling and conversion units and the second input terminal of the comparator respectively,
wherein the control module is further configured to:
output the 1st positive second control signal and the 1st negative second control signal based on the second comparison signals of the U comparisons after the U-th analog-to-digital conversion is completed;
the positive shared conversion unit takes the U-th positive second analog signal as a positive quantized margin signal, and the negative shared conversion unit takes the U-th negative second analog signal as a negative quantized margin signal; and
during the (U+1)-th to (U+V)-th analog-to-digital conversions in the i-th conversion cycle of the analog-to-digital conversion phase, output a second control signal to control opened/closed states of the V sets of second shared switches in the positive shared conversion unit and the V sets of third shared switches in the negative shared conversion unit, to perform V analog-to-digital conversions on the positive quantized margin signal and the negative quantized margin signal in a successive approximation manner.