A closed loop system for attaining premium telemetry performance for vector field electromagnetically coupled telemetry systems. The disclosed system utilizes a linear ramped envelope for downlink RF bursts, resulting in a detected pulse width in the implanted device which is proportional to the downlink...http://www.google.co.uk/patents/US5324315?utm_source=gb-gplus-sharePatent US5324315 - Closed-loop downlink telemetry and method for implantable medical device
