Title :
Nerual signal recorder with tunable gain amplifier using low transconductance OTA
Author :
Na, Dae Hoon ; Kim, Tae Wook
Author_Institution :
Dept. of Electr. & Electron. Eng., Yonsei Univ., Seoul, South Korea
Abstract :
In this paper, multi-channel neural signal recorder with tunable gain filter is proposed. It is characterized by small-gm OTA for lowering cutoff frequency. The prototype of the proposed system is designed in TSMC 0.18 μm CMOS technology. Filter consists of high pass filter of delta-gm structure OTA with 201.06 pA/V transconductance and tunable gain Gm-C low pass filter. Single slope ADC is used to convert filter output into digital bits. The tunable gain range, bandwidth, CMRR and input referred noise of resulting filter are 20-68 dB, 20 Hz-10 kHz, 185.7 dB at 5 kHz and 319 nV/VHz, respectively. Single slope ADC has 40 kS/s sampling rate and 1.2 V input range. Total power consumption per channel is 59 μW.
Keywords :
CMOS integrated circuits; analogue-digital conversion; biomedical electronics; brain; high-pass filters; low-pass filters; operational amplifiers; recorders; TSMC CMOS technology; delta-gm structure OTA; frequency 20 Hz to 10 kHz; high pass filter; low transconductance OTA; multichannel neural signal recorder; power 59 muW; single slope ADC; size 0.18 mum; tunable gain Gm-C low pass filter; tunable gain amplifier; tunable gain filter; voltage 1.2 V; Band pass filters; Capacitors; Gain; Integrated circuits; Power demand; Transconductance; Transistors; Gm-C filter; Neural signal recorder; delta-Gm; tunable gain filter;
Conference_Titel :
SoC Design Conference (ISOCC), 2010 International
Conference_Location :
Seoul
Print_ISBN :
978-1-4244-8633-5
DOI :
10.1109/SOCDC.2010.5682978
