A Low-Power Wide-Linear-Range Transconductance Amplifier
Analog Integrated Circuits and Signal Processing
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The increasing demand of personal health monitoring products with long battery life had forced designers to use of those circuits which consume low power. Operational Transconductance Amplifier (OTA) operating in subthreshold (weak inversion) region introduces a versatile solution for the realization of low power VLSI building blocks. This paper is focused on design of high performance OTA through use of high output impedance low-voltage current mirror circuit and observed responses proved to be much better than that of different complex mirror architectures. The proposed OTA incorporates high linearity and better performance in low-frequency applications. The achieved open loop dc gain and unity gain bandwidth (UGB) is 68.67 dB and 70.56 KHz respectively. The OTA is operated at supply voltage of 0.9 volt and consumes power in range of nanowatts. The architecture of OTA is performed in a standard TSMC 0.18 micrometer technology on BSIM 3v3 model and simulation results were analyzed using ELDO Simulator.