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In this paper, we propose a low-power variable-gm operational transconductance amplifier (OTA) for cellular neural networks (CNN). The OTA use MOSFETS operating in the weak inversion region. By using a variable resistor, the transconductance gm can be changed by the external bias voltage. The proposed OTA is verified by HSPICE simulations with the 0.18 mum standard CMOS device parameters. From the...
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