A micropower current-mode sigma-delta modulator for biomedical applications

Author

Farshidi, Ebrahim ; Alaei-sheini, Navid

Author_Institution

Dept. of Electr. Eng., Shahid Chamran Univ. of Ahvaz, Ahvaz, Iran

fYear

2009

fDate

9-11 April 2009

Firstpage

856

Lastpage

859

Abstract

This paper presents the design of a low power second-order continuous-time sigma-delta modulator for biomedical applications. The loop filter of this modulator has been implemented based on the nonlinear transconductance-capacitor (G_m-C) by employing current-mode technique. The nonlinear transconductance uses floating gate MOS (FG-MOS) transistors that operate in weak inversion region. The proposed modulator features low power consumption (80 uW), low supply voltage (1 V) and 62 dB dynamic range. Simulation results by HSPICE confirm that it is very suitable for low power biomedical instrumentation designs.

Keywords

MOSFET; SPICE; biomedical electronics; filters; sigma-delta modulation; HSPICE; floating gate MOS; loop filter; low power biomedical instrumentation designs; micropower current-mode sigma-delta modulator; noise figure 62 dB; nonlinear transconductance-capacitor; voltage 1 V; Analytical models; Brain modeling; Circuit simulation; Delta-sigma modulation; Digital modulation; Energy consumption; Low pass filters; Low voltage; Transconductance; Transfer functions;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing and Communications Applications Conference, 2009. SIU 2009. IEEE 17th

Conference_Location

Antalya

Print_ISBN

978-1-4244-4435-9

Electronic_ISBN

978-1-4244-4436-6

Type

conf

DOI

10.1109/SIU.2009.5136531

Filename

5136531