A distance-immune low-power 4-Mbps inductively-coupled bidirectional data link

A distance-immune inductively coupled link is based on a free-running oscillator tuned by coupled resonators. It can transfer data at up to 4 Mbps and 2 Mbps in half duplex with an LSK uplink and ASK downlink, respectively (at BER<; 5 × 10
^-8
). In uplink direction, the implanted unit consumes less than 0.1 pJ/bit while transmitting.