Preliminary Research on Super-Regenerative Receiver for Intracardiac Communication

Existing commercial pacemakers only provide single-chamber pacing and cannot achieve multi-chamber sequential pacing. Conduction Intracardiac Communication(CIC) has the characteristics of low power consumption and high security, which is very suitable for communication between multi-chamber leadless pacemakers. Because the pacemaker needs to be implanted into the heart, which limits its volume, power consumption, and other related parameters, and the super-regenerative circuit has its low power consumption and simple circuit structure, the super-regenerative receiver scheme is a good choice for intracardial communication where power consumption is the main problem. In this paper, a prototype super-regenerative receiver suitable for intracardiac communication is proposed. The differential instrument amplifier with high input impedance is used to filter out the external electromagnetic interference, reduce the input equivalent noise, and improve the signal-to-noise ratio. A super-regenerative oscillator and a filter amplifier circuit are designed to enhance the effectiveness and reliability of the communication. The experimental results show that the bit error rate of the circuit is lower than $\boldsymbol{1} \times \boldsymbol{10^{-5}}$ for the received signal of -92 dBm.