Title :
A current-reuse complementary-input chopper-stabilized amplifier for neural recording
Author :
Tan Yang ; Junjie Lu ; Poore, Nicholas ; Holleman, Jeremy
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Univ. of Tennessee, Knoxville, TN, USA
Abstract :
This paper presents a current-reuse complementary-input (CRCI) telescopic-cascode chopper stabilized amplifier with low-noise low-power operation. The current-reuse complementary-input strategy doubles the amplifier´s effective transconductance by full current-reuse between complementary inputs, which significantly improves the noise-power efficiency. A pseudo-resistor based integrator is used in the DC servo loop to generate a high-pass cutoff below 1 Hz. The proposed amplifier features a mid-band gain of 39.25 dB, bandwidth from 0.12 Hz to 7.6 kHz, and draws 2.57 μA from a 1.2-V supply and exhibits an input-referred noise of 3.57 μVrms integrated from 100 mHz to 100 kHz, corresponding to a noise efficiency factor (NEF) of 2.5. The amplifier is designed in 0.13 μm 8-metal CMOS process.
Keywords :
CMOS integrated circuits; bioelectric potentials; biomedical electronics; low noise amplifiers; low-power electronics; neurophysiology; resistors; 8-metal CMOS process; CRCI; DC servo loop; NEF; amplifier effective transconductance; bandwidth; bandwidth 0.12 Hz to 7.6 kHz; current 2.57 muA; current-reuse complementary-input strategy; current-reuse complementary-input telescopic-cascode chopper stabilized amplifier; frequency 100 mHz to 100 kHz; full current-reuse; gain 39.25 dB; high-pass cutoff; input-referred noise; low-noise low-power operation; mid-band gain; neural recording; noise efficiency factor; noise-power efficiency; pseudo-resistor based integrator; size 0.13 mum; voltage 1.2 V; voltage 3.57 muV; Capacitors; Choppers (circuits); Gain; Impedance; Noise; Servomotors; Transistors;
Conference_Titel :
New Circuits and Systems Conference (NEWCAS), 2014 IEEE 12th International
Conference_Location :
Trois-Rivieres, QC
DOI :
10.1109/NEWCAS.2014.6933991
