Low Emission, Open Loop Mac Protocol Compliant Implantable Fsk Modulator

The current paper proposes a low emission media access control (MAC) compliant frequency shift keying modulator to operate within wireless body area networks (WBANs). Frequency modulation is achieved by utilizing a ramp to encode the bit stream into two distinct frequencies. The negotiated frequency of operation for dynamic frequency shifting and frequency encoding is achieved changing the gradient of the ramp thorough load cap and charging current in a charge pump. A tent map chaotic map has been utilized to module the signal resulting in lowering EMI Emissions. The work has been implemented on 0.18 mu m AMS technology and silicon measurement results presented.