公开(公告)号：US20180138920A1

公开(公告)日：2018-05-17

申请号：US15634441

申请日：2017-06-27

申请人： Yogesh Jayaraman Sharma ,  Arthur J. Kalb

发明人： Yogesh Jayaraman Sharma ,  Arthur J. Kalb

IPC分类号： H03M1/12 ,  A61B5/04 ,  A61B5/0428

CPC分类号： H03M1/1245 ,  A61B5/04017 ,  A61B5/04284 ,  A61B5/04288 ,  H03M1/00 ,  H03M1/06 ,  H03M1/0629 ,  H03M1/10 ,  H03M1/1009 ,  H03M1/12

摘要： An analog front end system can include a filter bypass switch connected in a boot-strapped configuration to pull a control terminal of the filter bypass switch above or below a supply voltage. Using bootstrapped switches can allow both the charge injection and capacitive coupling of the bypass switches of a differential anti-alias filter (AAF) to be common mode. A differential input signal of the ADC is not affected by the charge injection and capacitive coupling of the bypass switches in the AAF filter to a first order.

公开(公告)号：US10135459B2

公开(公告)日：2018-11-20

申请号：US15334011

申请日：2016-10-25

申请人： Yogesh Jayaraman Sharma ,  Arthur J. Kalb

发明人： Yogesh Jayaraman Sharma ,  Arthur J. Kalb

IPC分类号： H03M3/00 ,  A61B5/0428 ,  A61B5/00

摘要： A low power high precision mixed signal analog to digital converter is provided for processing biometric signals in the presence of a large interferer signal for cableless patient monitoring; a capacitive difference circuit produces an analog difference signal by differencing an analog feedback loop signal and an input signal; an analog-to-digital converter sigma delta converter produces a digital version of the difference signal, a digital feedback loop includes a digital integrator and a capacitive digital-to-analog converter configured to produce the analog loop feedback signal based upon the digital version of the difference.

公开(公告)号：US20180132750A1

公开(公告)日：2018-05-17

申请号：US15621621

申请日：2017-06-13

申请人： Arthur J. Kalb ,  Yogesh Jayaraman Sharma ,  Marvin Liu Shu

发明人： Arthur J. Kalb ,  Yogesh Jayaraman Sharma ,  Marvin Liu Shu

IPC分类号： A61B5/0428 ,  A61B5/00 ,  A61B5/0452

CPC分类号： A61B5/04288 ,  A61B5/0006 ,  A61B5/0452 ,  A61B5/7207 ,  A61B5/7217 ,  A61B5/7225 ,  H03M1/0673 ,  H03M1/18 ,  H03M1/68 ,  H03M3/414 ,  H03M3/46

摘要： An analog front end (AFE) system for substantially eliminating quantization error or noise can combine an input of an integrator circuit in the AFE system with an input of the digital-to-analog converter (DAC) circuit in the feedback loop of the AFE system. By combining the input of the integrator with the input of the DAC circuit in the feedback loop, the in-band quantization noise of the filter can be substantially eliminated, thereby improving measurement accuracy.