I. Introduction
Multichannel simultaneous recordings of neural action potentials (APs) facilitate the studies in neuroprosthetics. State-of-the-art implantable neural recording microsystems can achieve real-time wireless monitoring of APs over 100 channels. However, increasing the number of channels gives rise to a larger data volume, which requires higher data rate and higher bandwidth for data transmission. The power dissipation of wireless transmission block is therefore increased dramatically. While a sampling frequency of 24 KHz per channel and the number of bits per sample is 10, a 100-channel microsystem will require a transmission bandwidth of 24 Mbps. It is far beyond the existing telemetry link limit of about 1–2 Mbps for biomedical applications [1].