Title :
1 V CMOS instrumentation amplifier with high DC electrode offset cancellation for ECG acquisition systems
Author :
Nanda, Chinmayee ; Mukhopadhyay, J. ; Mandal, Debashis ; Chakrabarti, S.
Abstract :
A new circuit topology for a low voltage, low noise instrumentation amplifier (IA) applicable for electrocardiogram signal acquisition system is designed. This circuit is based on the current feedback topology, which is implemented using folded cascode structure at both input and output stages. This helps to sense very low common mode voltage. Achieved input common mode range (ICMR) is 71.43 - 700 mV. DC electrode offset cancellation circuit is realized to remove DC electrode offset along with the low frequency noise. The IA can withstand a high DC electrode offset of ±18 mV. It also has a wide input dynamic range of ±1 ¿V to ±1 mV. The voltage gain is around 38 dB. It consumes 110 ¿W power with a supply voltage of 1 V. A high common mode rejection ratio (CMRR) of 80 dB is achieved. The integrated input referred noise is 1.64 ¿Vrms (0.1 Hz - 150 Hz). This design is implemented in 0.18 ¿m standard CMOS process.
Keywords :
CMOS integrated circuits; electrocardiography; low noise amplifiers; low-power electronics; network topology; signal detection; CMOS instrumentation amplifier; ECG acquisition systems; circuit topology; common mode rejection ratio; current feedback topology; electrocardiogram signal acquisition system; folded cascode structure; high DC electrode offset cancellation; power 110 muW; size 0.18 mum; voltage 1 V; voltage 71.43 muV to 700 muV; Circuit noise; Circuit topology; Electrocardiography; Electrodes; Feedback circuits; Instruments; Low voltage; Low-noise amplifiers; Noise cancellation; Signal design; 1 V CMOS instrumentation amplifier; DC elctrode offset cancellation; folded cascode;
Conference_Titel :
Students' Technology Symposium (TechSym), 2010 IEEE
Conference_Location :
Kharagpur
Print_ISBN :
978-1-4244-5975-9
Electronic_ISBN :
978-1-4244-5974-2
DOI :
10.1109/TECHSYM.2010.5469187
