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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.