APPARATUS AND METHOD TO DISCRIMINATE BETWEEN TELEMETRY DOWNLINK SIGNALS AND NOISE IN AN IMPLANTED DEVICE

摘要

A circuit arrangement enables an implanted medical device (IMD) to distinguish between a radio frequency (RF) signal and noise that is transmitted by an external programming unit. In an example embodiment, the IMD includes a receiver circuit a counter circuit counts edges of the demodulated signal occurring within a selected time period. A decoder circuit of the receiver circuit decodes the demodulated signal and compares the number of edges counted with a valid signal before the decoded signal is transmitted to a telemetry processor of the IMD. The receiver circuit also includes a validation circuit that verifies the validity of the decoded signal before transmitting the decoded signal to the telemetry processor.