In order to develop the accuracy of a battery measurement chip
based on BCD180 HLV compatible process
a Sigma-Delta A/D Converter for battery measurement chip was implemented.The modulator of the ADC adopted single loop three orders feedback structure and OSR of 256
the digital filter featured ripples within±0.001 dB in pass band and-100 dB attenuation in stop band.The ADC consumed a power of 4.67mW (0.935mA)
and the layout area was 2.56mm×0.51 mm at 5Vsupply.It had an SNDR of 87 dB
an SFDR of 99.2dB and the accuracy 0.01% in 1kHz bandwidth.