Telemetry polling circuit with noise discrimination and selectable tuning

A medical device receiver adapted to receive radio frequency (RF) signals, comprising:

• a telemetry central processing unit;
• a control unit coupled to the processing unit and configured to:
• operate the receiver in a first mode to poll for an RF signal for up to a first time interval;
• analyze the RF signal to detect an element of a valid input signal during the first time interval;
• in response to detecting the element of the valid input signal in the first time interval, operate the receiver in a second mode to poll for the RF signal over a second time interval longer than the first time interval,
• analyze the RF signal over the second time interval to detect a valid modulation of the RF signal over the second time interval;
• in response to detecting the valid modulation of the RF signal over the second time interval, enabling the receiver to establish a telemetry communication session with a transmitting device;
• and
• a data analyzer enabled by the control unit during the first mode to detect if a carrier signal is present;
• in response to detecting the carrier signal being present, the control unit configured to maintain operation of the receiver in the first mode for an entire duration of the first time interval.