A sub-threshold voltage ladder rectifier for orthogonal current-reuse neural amplifier

Author

Changhyuk Lee ; Johnson, Bryant ; Molnar, Adrienn

Author_Institution

Sch. of Electr. & Comput. Eng., Cornell Univ., Ithaca, NY, USA

fYear

2013

fDate

Oct. 31 2013-Nov. 2 2013

Firstpage

358

Lastpage

361

Abstract

We demonstrate an inductively powered, orthogonal current-reuse multi-channel amplifier for power-efficient neural recording. The power rectifier uses the input swing as a self-synchronous charge pump, making it a fully passive, full-wave ladder rectifier. The rectifier supplies 10.37μW at 1.224V to the multi-channel amplifier, which includes bias generation. The prototype device is fabricated in a TSMC 65nm CMOS process, with an active area of 0.107mm². The maximum measured power conversion efficiency (PCE) is 16.58% with a 184mV input amplitude.

Keywords

CMOS integrated circuits; bioelectric phenomena; biomedical measurement; low-power electronics; neurophysiology; power amplifiers; prosthetic power supplies; rectifiers; PCE; TSMC CMOS; active area; bias generation; full-wave ladder rectifier; inductively powered amplifier; input amplitude; input swing; orthogonal current-reuse multichannel amplifier; orthogonal current-reuse neural amplifier; power 10.37 muW; power conversion efficiency; power rectifier; power-efficient neural recording; prototype device; self-synchronous charge pump; size 65 nm; sub-threshold voltage ladder rectifier; voltage 1.224 V; voltage 184 mV; CMOS integrated circuits; Charge pumps; Coils; Monitoring; Noise; Threshold voltage; Wireless communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Biomedical Circuits and Systems Conference (BioCAS), 2013 IEEE

Conference_Location

Rotterdam

Type

conf

DOI

10.1109/BioCAS.2013.6679713

Filename

6679713