A CMOS low-power transceiver with reconfigurable antenna interface for medical implant applications

Tino Copani, Seungkee Min, Sridhar Shashidharan, Sudipto Chakraborty, Mark Stevens, Sayfe Kiaei, Bertan Bakkaloglu

Research output: Contribution to journalArticlepeer-review

51 Scopus citations


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 g m-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.

Original languageEnglish (US)
Article number5738362
Pages (from-to)1369-1378
Number of pages10
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number5
StatePublished - May 2011


  • All-digital fractional-N type-I phased-locked loop (PLL)
  • injection locking
  • low power
  • medical implants
  • reconfigurable RF
  • super-regenerative receiver (RX)

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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