Abstract
The paper presents an ultra low power telemetry system for neural recording applications. Presented system operates in 433 MHz ISM band. It makes use of FSK modulation and offers 2 Mbits/s throughput. The only external components of the transmitter are power supply bypass capacitors and a planar coil, which is a part of an oscillator's tank and also acts as a magnetic antenna. Presented transmitter is based on a modified complementary Colpitts oscillator. It is able to operate at very low supply voltage, down to 0.9 V. Besides voltage controlled oscillator (VCO) transmitter includes a prescaler, which divides RF frequency by 16. Resulting signal can be used to clock digital part of the system. Presented transmitter was implemented in 180 nm CMOS process and consumes only 450 μW. The accompanying receiver was equipped with an adaptive, software based FSK demodulator.
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