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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...
In this paper, an OTA can be operated in both weak and strong inversion regions is presented. The proposed OTA has advantages: wide-common-mode-input-range, high-CMRR and low-voltage-operation. The proposed OTA is evaluated through Star-HSPICE with 0.18 mum CMOS device parameters (LEVEL53). Simulations results demonstrate a CMRR of 93 dB, a common-mode-input-range of 65 mV to 720 mV and a current...
This paper describes highly linear CMOS OTA with compensation of mobility reduction. The proposed OTA is circuitry of the adaptive bias based OTA with a tail current source, and can reduce the influence of the mobility reduction. Through Star-HSPICE simulations, we could confirm that the third-order harmonic (HD3) can be reduced by 26.6 dB by using the proposed technique. Lastly, as an application...
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