To guarantee the safety and efficiency of new energy automobiles

the acquisition front-end circuit of battery management IC requires high precision voltage detection. Therefore

using IC design methodology of System to Chip

system-level design and verification are carried out first. Based on new acquisition front-end structure

high-precision multi-channel voltage synchronous detection is achieved

cell voltage detection error is less than 5mV

and accuracy is about 0.15%. Then

Σ-ΔADC modulator is designed

which is the key module of chip-level high-precision acquisition front-end circuit of BMS SoC. After behavioral simulations

circuit and layout design and simulation

the Σ-Δ modulator ENOB reaches 16.58

and SNDR reaches 101.6 dB

which achieves design requirements. The system-level verification of high-precision acquisition front-end circuit and the design of its Σ-ΔADC modulator make preparations for the implementation of high-precision acquisition front-end in BMS SoC.