Delta-Sigma Control Loop For Energy-Efficient Electrical Stimulation with Arbitrary-Shape Stimuli

This paper presents a novel multi-channel stimulation backend with a multi-bit delta-sigma control loop, which enables precise adjustment of the stimulation current through modulation of the supply voltage. This minimizes the overhead voltage of series circuitry to the stimulation load and avoids the associated energy loss. Additionally, to...

An ultra low power CMOS pA/V transconductor and its application to wavelet filters

Two compact ultra low-power CMOS triode transconductor topologies denoted VLPT-g(m) and Delta-g(m) are proposed. In both circuits, input transistors are kept in the triode region to benefit from the lowest g(m)/I-D ratio. This allows achieving a small-signal transconductance g(m) down to hundreds of pA/V, making such transconductors attractive...