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

Claim 19:
20. The analog-to-digital conversion circuit according to claim 2, wherein in response to the first analog signals of N channels including differential signals, each of the sampling and conversion modules comprises a positive sampling and conversion unit and a negative sampling and conversion unit, the positive sampling and conversion unit including U second sampling capacitors connected in parallel, U sets of second hold switches, and a third conversion switch, and the negative sampling and conversion unit including U third sampling capacitors connected in parallel, U sets of third hold switches, and a fourth conversion switches, wherein U is an integer greater than or equal to 1,
a positive first analog signal of a channel corresponding to the positive sampling and conversion unit is input at a first input terminal of the positive sampling and conversion unit, a positive first control signal is input at a second input terminal thereof, and a positive second analog signal is output to the comparator in response to the third conversion switch being closed,
a negative first analog signal of a channel correspond to the negative sampling and conversion unit is input at a first input terminal of the negative sampling and conversion unit, a negative first control signal is input at a second input terminal thereof, and a negative second analog signal is output to the comparator in response to the fourth conversion switch being closed,
a positive second analog signal is input at a first input terminal of the comparator, a negative second analog signal is input at a second input terminal thereof, and a second comparison signal is output at an output terminal thereof,
the second comparison signal is input at an input terminal of the control module, a converted second digital signal is output at a first output terminal thereof, a positive first control signal is output at a second output terminal thereof, and a negative first control signal is output at a third output terminal thereof,
wherein one terminal of each of the second sampling capacitors in the positive sampling and conversion unit is connected to the third conversion switch, the other terminal thereof is connected to one terminal of a set of second hold switches, and the other terminal of the set of second hold switches is respectively connected to one of the positive first analog signal, a device voltage VDD, a ground GND, or a preset DC voltage, and
one terminal of each of the third sampling capacitors in the negative sampling and conversion unit is connected to the fourth conversion switch, the other terminal thereof is connected to one terminal of a set of third hold switches, the other terminal of the set of third hold switches is connected to one of the negative first analog signal, the device voltage VDD, the ground GND, or the preset DC voltage, respectively.