A Wideband 4-Level Frequency-Shift Keying Demodulator for Biomedical Implants

A wideband 4-level frequency-shift keying (FSK) modulation scheme for biomedical implants is investigated and its digital demodulator circuits have been implemented with a 0.18m 1P6M standard CMOS technology process. The application of the implementation technique is transferring data to wireless biomedical implants at a higher data-rate modulation scheme of 4-level FSK. The proposed demodulator circuits have been validated with test chip measurement results. It consumes the power of 7.2mW from a 1.8V supply.