A low power high CMRR CMOS instrumentation amplifier based on differential voltage: current conveyor for beta-dispersion range bio-impedance applications
作者： Wen-Yaw Chung , Rosula S. J. Reyes , Angelito A. Silverio
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摘要: In this paper, a low power and high CMRR Instrumentation Amplifier is presented. It has been designed for use in Bio-Impedance (BI) applications that operate within the beta dispersion frequency range. An IA with input impedance allows extraction of amplitude BI signal while reducing error signals noise associated tissue instrument interface. These result from parasitic impedances electrodes their corresponding half-cell potentials, finite output current source, common-mode coupled to source. The current-mode structure utilizing Differential Voltage Current Conveyor (DVCC) provide most CMRR. This an improved performance regard operating as compared voltage-mode topologies. DVCC Folded-Cascode Operational Transconductance (FCOTA) which provides voltage gain. FC-OTA analog buffer serves drive stage. using TSMC 0.35µm CMOS 2P4M Technology. pre-layout post-layout verified HSPICE. layout was done LAKER. achieved, simulation, 98dB, 4.85MD (differential mode) 1.4MD (common-mode) at 1MHz, DC gain 67dB, Unity Gain Bandwidth (UGBW) 7.2MHz. IA's dissipation only 1.27mW open-loop configuration. Transient simulations interface model 1MHz showed Total Harmonic Distortion (THD) 1.9%, Signal Noise Ratio (SNR) 49.5dB Spurious Free Dynamic Range (SFDR) 33.dB. area 250µm × 250µm.
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