A Design of 2nd Order DT Sigma-Delta Modulator for Medical Implants

被引:0
|
作者
Raheem, M. A. [1 ]
Chari, K. Manjunatha [2 ]
Sohel, Mohammed Arifuddin [1 ]
Majeed, M. A. Mushahhid [1 ]
机构
[1] Muffakham Jah Coll Engn & Technol, ECED, Hyderabad, Andhra Pradesh, India
[2] GITAM Univ, ECED, Visakhapatnam, Andhra Pradesh, India
来源
2015 IEEE ASIAN PACIFIC CONFERENCE ON POSTGRADUATE RESEARCH IN MICROELECTRONICS AND ELECTRONICS (PRIMEASIA) | 2015年
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中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This paper proposes the design of a second order sigma delta modulator (SDM) to be used in medical implants for conversion of low frequency human body analog signals into digital format. The lifetime of a medical implant is governed by the power consumed by various blocks in it, of which the block consuming maximum power is the Analog to Digital Converter (ADC). This paper aims at designing a power optimized ADC by making use of CMOS operational transconductance amplifier(OTA) whose transistors are biased in sub threshold conduction region by making use of body biasing technique. The modulator thus implemented consumes a power of 4.6 mu W from a 0.9V power supply. The modulator achieves an SNR of 64dB for a bandwidth of 500 Hz.
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页码:6 / 10
页数:5
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