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We present a 1-GΩ CMOS transimpedance amplifier (TIA) suitable for processing sub-nA-level currents in electrochemical biosensor signal-acquisition circuits. Use of a two-stage active transconductor provides resistive feedback in place of a single large-area linear resistor. We engineer the TIA feedback loop to suppress output offset caused by dc input leakage currents of ±0.9 nA. We also implement...
This paper presents and demonstrates the necessity of microstrip patch and slot antennas for RFID applications. Various microstrip patch and slot antennas fed by a feed line designed on a 2.2 permittivity Rogers Duriod substrate are considerably studied and comprehensively analyzed as new and authentic new design approaches antennas. The antennas have been designed using the 3D EM High Frequency Structure...
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