Patent ID: 9748986
Date: 2017-08-29
CPC Classifications: A61N,H04B

Claim:
1. An RF telemetry reception circuit for an implantable medical device, comprising: an antenna for receiving a baseband binary signal from an external device, wherein the baseband binary signal is double-modulated by a first frequency carrier and a second frequency carrier; a passive bandpass filter configured to filter the double-modulated signal received by the antenna to attenuate signals outside of a selected band; a first envelope detection circuit that receives the filtered signal; an active bandpass filter centered on a frequency twice the first frequency carrier and having a bandwidth twice a bandwidth of the baseband binary signal, wherein the first envelope detection circuit provides a resultant signal to the active bandpass filter corresponding to a frequency band of the active bandpass filter; a second envelope detection circuit of that outputs a rectified version of the output from the active bandpass filter; and a digital demodulation circuit configured to produce an output signal that corresponds with the baseband binary signal and is based on the rectified signal.