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Low-Voltage Current-Sensing CMOS Interface Circuit for Piezo-Resistive Pressure Sensor
Apinunt Thanachayanont,Suttisak Sangtong 한국전자통신연구원 2007 ETRI Journal Vol.29 No.1
A new low-voltage CMOS interface circuit with digital output for piezo-resistive transducer is proposed. An input current sensing configuration is used to detect change in piezo-resistance due to applied pressure and to allow lowvoltage circuit operation. A simple 1-bit first-order deltasigma modulator is used to produce an output digital bitstream. The proposed interface circuit is realized in a 0.35 μm CMOS technology and draws less than 200 μA from a single 1.5 V power supply voltage. Simulation results show that the circuit can achieve an equivalent output resolution of 9.67 bits with less than 0.23% nonlinearity error.
Ultra-Low-Power Differential ISFET/REFET Readout Circuit
Apinunt Thanachayanont,Silar Sirimasakul 한국전자통신연구원 2009 ETRI Journal Vol.31 No.2
A novel ultra-low-power readout circuit for a pH-sensitive ion-sensitive field-effect transistor (ISFET) is proposed. It uses an ISFET/reference FET (REFET) differential pair operating in weak-inversion and a simple current-mode metal-oxide semiconductor FET (MOSFET) translinear circuit. Simulation results verify that the circuit operates with excellent common-mode rejection ability and good linearity for a single pH range from 4 to 10, while only 4 nA is drawn from a single 1 V supply voltage.
A Micropower CMOS Preamplifier for Cochlear Implant System
Apiradee Yodtean,Apinunt Thanachayanont 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
This paper proposes a CMOS low-power low-voltage microphone preamplifier for a cochlear implant system. The proposed preamplifier using the Flipped Voltage Follower Current Sensing (FVFCS) technique to achieve low voltage, low power consumption. The proposed circuit was designed and simulated using a 0.35㎛ CMOS process. Simulation results showed that the preamplifier can achieve 22-㏈ voltage gain while dissipating only 5.2 ㎼ from 1.4-V power supply voltage.