An ultra-low power RF interface for wireless-implantable microsystems

作者：Navaii Mehdi Lotfi; Jalali Mohsen^*; Sadjedi Hamed

来源：Microelectronics Journal, 2012, 43(11): 848-856.

DOI：10.1016/j.mejo.2012.06.006

• Biomedical implant
• Data telemetry
• ASK demodulator
• Low power consumption
• Full integration

This paper presents an efficient radio frequency (RF) front-end for power and data telemetry in biomedical implantable devices. The fully integrated system includes amplitude shift keying (ASK) demodulator, low drop out (LDO) power regulator, full wave voltage rectifier and limiter circuit. The demodulator utilizes a new ultra low power envelope amplifier that removes the need for any voltage comparator or Schmitt trigger circuit. With a carrier frequency of 12 MHz and 1 Mbps data rate, the proposed ASK demodulator achieves a modulation index range from 5% up to 100% while consuming less than 35 mu W from induced power. The regulator can provide a maximum stimulation current of 1.2 mA under a ripple suppressed 3.3 V supply. Designed in a 0.18 mu m CMOS process, the system totally draws about 35 mu A excluding the stimulation current.

• 出版日期2012-11