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460 mu W 32 dB image rejection ratio second-order active-RC complex filter with improved power efficient opamp
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460 mu W 32 dB image rejection ratio second-order active-RC complex filter with improved power efficient opamp
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Journal Article
460 mu W 32 dB image rejection ratio second-order active-RC complex filter with improved power efficient opamp
2013
Overview
This paper presents an ultra-low-power second-order Chebyshev active-RC complex filter for a low-IF ultra-low-power receiver. By utilising a pole-cancellation push-pull buffer with feedforward phase compensation technology, the operational amplifier (opamp) realises superior stability while maintaining high gain bandwidth and ultra-low power consumption. A second-order complex filter with four proposed opamps and an adaptive bias fabricated in standard 180 nm CMOS process consumes only 460 mu W at 1.8 V power supply. The measured centre frequency is 3 MHz and bandwidth is 2 MHz, while it achieves 32 dB image rejection ratio at the centre frequency.
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