Abstract
A frequency-shift keying (FSK) receiver for downlink data transfer through the inductive power link is presented for biomedical implants in this work. Inspired by the design in [1], the proposed design is composed of an analog front-end, data detector, and a digital block. The data detector demodulates data bits with mixed-signal circuit operations and derives a constant-frequency clock at the same time. The receiver is designed and simulated with a 0.18-m CMOS process. With a minimum received signal amplitude of 0.4 Vppd, the highest data rate reaches 1 Mbps while receiving a 13/16-MHz FSK carrier signal. The simulated power consumption is 41.2 W.