Title :
A CMOS Low-Power Transceiver With Reconfigurable Antenna Interface for Medical Implant Applications
Author :
Copani, Tino ; Min, Seungkee ; Shashidharan, Sridhar ; Chakraborty, Sudipto ; Stevens, Mark ; Kiaei, Sayfe ; Bakkaloglu, Bertan
Author_Institution :
Dept. of Electr., Comput. & Energy Eng., Arizona State Univ., Tempe, AZ, USA
fDate :
5/1/2011 12:00:00 AM
Abstract :
A low-power transceiver for medical implant communication service is presented. The device consists of three subsystems, which perform wake-up signal reception, data-link binary frequency-shift keying (BFSK) reception, and transmission, respectively. A common antenna interface is reused in the three subsystems, reducing circuit complexity and number of external components. Super-regenerative architecture is used for wake-up reception, and gm-boosted common-gate stages are used to optimize receiver (RX) performance with low power consumption. The transmitter employs an all-digital frequency-locked loop to directly drive a class AB power amplifier. The transmitter can alternatively use an injection-locked power oscillator for lower bit rates and power consumption. The integrated circuit is designed and fabricated on a 0.18-μm CMOS process. The wake-up RX achieves a -80-dBm sensitivity for a 50-kb/s signal and a 280-μW dissipation. The BFSK RX achieves a -97-dBm sensitivity for a 75-kb/s signal and a 2-mW power consumption. Finally, the transmitter achieves an output power of -5 dBm for a power consumption of 2.9 mW.
Keywords :
CMOS integrated circuits; biomedical communication; digital phase locked loops; frequency shift keying; injection locked oscillators; power amplifiers; prosthetics; radio transceivers; BFSK; CMOS low-power transceiver; all-digital frequency-locked loop; binary frequency-shift keying; circuit complexity; class AB power amplifier; gm-boosted common-gate stages; injection-locked power oscillator; medical implant communication service; power 2 mW; power 2.9 mW; power 280 muW; reconfigurable antenna interface; signal reception; size 0.18 mum; super-regenerative architecture; transmitter; Antennas; Microwave integrated circuits; Modulation; Noise; Oscillators; Sensitivity; Transceivers; All-digital fractional-$N$ type-I phased-locked loop (PLL); injection locking; low power; medical implants; reconfigurable RF; super-regenerative receiver (RX);
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2011.2116036