An ultra‐low‐power CWM/SCM demodulator for inductive‐powered IMDs with the DRCF ratio of 50% and the powering index of 75%

Abstract

SummaryIn this paper, an ultra‐low‐power and area‐efficient demodulator circuit for wireless downlink SCM/CWM modulation schemes is proposed. The proposed demodulator offers high performances and allows simultaneous power and downlink data transmission over a single 13.56‐MHz inductive link. The proposed method requires only two carrier cycles per data bit period, and also, a power index of 75% is obtained. Although the proposed demodulator can be applicable to other wireless systems, here, it is intended for implantable medical devices. To prove the performance of the proposed demodulator circuit, it has been designed and post‐layout simulations are provided using a standard 65‐nm CMOS technology and occupies 27 × 32 μm2 of active area. Post‐layout simulation results indicate that with a 1‐V power supply, the proposed circuit achieves an ultra‐low‐power consumption of 8.51 μW at a data rate of 6.78 Mb/s corresponding to an energy efficiency of 1.25 pJ/bit.