Title :
Test signal generation for the calibration of analog front-end circuits in biopotential measurement applications
Author :
Li Xu ; Junpeng Feng ; Yuchi Ni ; Onabajo, Marvin
Author_Institution :
Dept. of Electr. & Comput. Eng., Northeastern Univ., Boston, MA, USA
Abstract :
A test signal generator to calibrate analog front-ends for biopotential measurements is presented. The integrated signal generator enables detection of the input impedance at the front-end instrumentation amplifier based on current injection and amplitude detection. It can generate picoampere currents while ensuring a high output impedance of 2.9GΩ up to 100Hz. The test signal generator was designed and simulated in 0.13μm CMOS technology and it consists of a temperature-compensated relaxation oscillator, a frequency divider, a limiter, and an operational transconductance amplifier.
Keywords :
CMOS analogue integrated circuits; bioelectric potentials; calibration; instrumentation amplifiers; signal generators; CMOS technology; amplitude detection; analog front-end circuit calibration; biopotential measurement; current injection; frequency divider; front-end instrumentation amplifier; input impedance detection; integrated signal generator; limiter; operational transconductance amplifier; size 0.13 mum; temperature-compensated relaxation oscillator; test signal generation; Capacitance; Electrodes; Impedance; Instruments; Noise; Signal generators; Transconductance; Test signal generation; dry-contact electrode measurement technique; input capacitance cancellation; low-transconductance OTA; self-calibrated analog front-end;
Conference_Titel :
Circuits and Systems (MWSCAS), 2014 IEEE 57th International Midwest Symposium on
Conference_Location :
College Station, TX
Print_ISBN :
978-1-4799-4134-6
DOI :
10.1109/MWSCAS.2014.6908573
