An integrated CMOS ultrawideband wireless telemetry transceiver for wearable and implantable medical sensor applications is reported in this letter. This high duty cycled, noncoherent transceiver supports scalable data rate up to 10 Mb/s with energy efficiency of 0.35 nJ/bit and 6.2 nJ/bit for transmitter and receiver, respectively. A prototype wireless capsule endoscopy using the proposed transceiver demonstrated in vivo image transmission of 640 × 480 resolution at a frame rate of 2.5 frames/s with 10 Mb/s data rate.

This brief presents an on-off LC oscillator-based ultrawideband impulse radio (UWB-IR) transmitter for long-range application. A thorough theoretical analysis of the pulse generation is provided. Implemented in a 0.18-μm CMOS, the transmitter works in the UWB lower band of 3-5 GHz and consumes an ultralow average power of 236 μW at 1.8-V power supply. UWB pulses with a bandwidth of 2 GHz and 10-dB sidelobe suppression are generated. The transmitter can deliver a large differential output swing of 4.9 V under 100-Ω load with the highest power efficiency of 25.4% to date. It is targeted for wireless sensor network (WSNs) and wireless personal area network (WPAN) applications.Index Terms-CMOS IC, FCC spectral mask, impulse radio (IR), low data rate, low duty cycle, low power, pulse generator, ultrawideband (UWB), wireless.

A smart temperature sensor has been realized using TSMC 0.18μm standard CMOS process. Substrate PNP transistorsare used to extract the temperature information. Using the techniques of dynamic element matching (DEM), single-transistor approach and offset cancellation, the process spread between batches on the transistors become the main inaccuracy sources of the temperature sensor. The sensor uses a single-point calibration method that reduces the process spread and simplifies trimming. The temperature sensor can realize an inaccuracy (±3δ) within ±0.1 C  in the temperature range from 20 C  to 50 C  after single-point calibration. The average power consumption of the sensor is 16μW at the conversion rate of 10Hz. These properties allow the use of the temperature sensor in clinicalelectronic thermometers.

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