title: Bandwidth tunable amplifier for recording biopotential signals.
abstract: This paper presents a low noise, low power, bandwidth tunable amplifier for bio-potential signal recording applications. By employing depletion-mode pMOS transistor in diode configuration as a tunable sub pA current source to adjust the resistivity of MOS-Bipolar pseudo-resistor, the bandwidth is adjusted without any need for a separate band-pass filter stage. For high CMRR, PSRR and dynamic range, a fully differential structure is used in the design of the amplifier. The amplifier achieves a midband gain of 39.8dB with a tunable high-pass cutoff frequency ranging from 0.1Hz to 300Hz. The amplifier is fabricated in 0.18εm CMOS process and occupies 0.14mm(2) of chip area. A three electrode ECG measurement is performed using the proposed amplifier to show its feasibility for low power, compact wearable ECG monitoring application.
authors.affiliation: Nanoscale Integrated Sensors and Circuits Laboratory, Tufts University, Medford, MA 02155, USA.
authors.forename: Sungkil
authors.initials: S
authors.lastname: Hwang
authors.forename: Kofi
authors.initials: K
authors.lastname: Aninakwa
authors.forename: Sameer
authors.initials: S
authors.lastname: Sonkusale
mesh_terms: D000200:Action Potentials / Q000502:physiology*; D000669:Amplifiers, Electronic; D001921:Brain / Q000502:physiology*; D004562:Electrocardiography / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005240:Feasibility Studies; D006801:Humans; D018670:Monitoring, Ambulatory / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*