Low Threshold Voltage MOSFET - A Potential Candidate for Biomedical IC Design

As the world is progressing, futuristic innovation demand is testing the limits of design related to analog circuits. Thus design with traditional MOSFET is becoming more complex. In this paper, we propose the use of low-threshold voltage (LVT) MOSFET instead of traditional MOSFET. Operational trans-conductance amplifiers were designed with both the traditional and LVT MOSFETs and a comparison was made. Further, a fifth order low pass filter with LVT MOSFETs was designed to show it's effectiveness in removing noise from ECG signal. The simulation was done in Cadence, an industry -grade software, with 45nm technology. The spectre simulation result shows that the low power filter produces a gain of 44.65 dB, a total harmonic distortion of -53.71 dB, an input-referred-noise of 130 <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">/√Hz</tex> within a bandwidth of 246.9 Hz.