Title :
A Novel Current Feed-back Sub-Nano-Siemen Transconductance Circuit Suitable for Large Time-Constant Bio-medical Applications
Author :
Hasan, S. M Rezaul ; Ula, Nazmul
Author_Institution :
Center for Res. in Analog & VLSI Microsyst. Design, Massey Univ., Auckland
Abstract :
A novel (1/R - 1/gm - gm) circuit using current feedback technique capable of delivering subnanosiemen and lower transconductance values is proposed. Compared to most other nanotransconductors which usually operate in weak inversion this circuit operates in the strong inversion saturation region and hence has a much more predictable behavior. It is suitable for application in several-Hz to sub-Hz Gm-C filters requiring large time constants. It can also be used for potentiostat designs in bioelectrochemical detection systems which has speeds in the range of several Hz. The transconductor demonstrates high linearity (THD ap -78dB) and noise immunity. Also, the transconductor can be suitably internally compensated with a high phase margin in order to prevent oscillatory behavior due to layout inherent parasitic feedback paths in a large Gm-C filter implementation
Keywords :
bioelectric phenomena; biomedical electronics; circuit feedback; filters; (1/R - 1/gm - gm) circuit; Gm-C filters; bioelectrochemical detection systems; biomedical devices; current feedback technique; large time constant biomedical applications; nanotransconductors; potentiostat designs; subnanosiemen transconductance circuit; Active filters; Band pass filters; Capacitance; Diodes; Feedback circuits; Frequency; Nanobioscience; Resistors; Transconductance; Transconductors; Gm-C filters; Large time constant; bio-medical devices; transconductor;
Conference_Titel :
Circuits and Systems, 2006. APCCAS 2006. IEEE Asia Pacific Conference on
Conference_Location :
Singapore
Print_ISBN :
1-4244-0387-1
DOI :
10.1109/APCCAS.2006.342100
