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

Claim 22:
23. 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, V sets of second shared switches, and a fifth conversion switch, and the negative shared conversion unit including V third shared capacitors connected in parallel, V sets of third shared switches, and a sixth conversion switch, wherein V is an integer greater than or equal to 1,
the positive shared conversion unit is respectively connected to the N positive sampling and conversion units and the first input terminal of the comparator through the fifth conversion switch, and the negative shared conversion unit is respectively connected to the N negative sampling and conversion units and the second input terminal of the comparator through the sixth conversion switch,
wherein the control module is further configured to:
control the fifth conversion switch and the sixth conversion switch to open during the first U analog-to-digital conversions in the i-th conversion cycle of the analog-to-digital conversion phase; and control the fifth conversion switch and the sixth conversion switch to close after the U-th analog-to-digital conversion is completed; and the control module outputs the 1st positive second control signal and the 1st negative second control signal based on the second comparison signals of the U comparisons; and
take the U-th positive second analog signal as a positive quantized margin signal and take the U-th negative second analog signal as a negative quantized margin signal, the analog-to-digital conversion circuit performs V analog-to-digital conversions on the positive quantized margin signal and the negative quantized margin signal in a successive approximation manner.