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- Title
460 μW 32 dB image rejection ratio second-order active-RC complex filter with improved power efficient opamp.
- Authors
Wang, J.; Ye, L.; Chen, L.; Liu, J.; Liao, H.
- Abstract
An ultra-low-power second-order Chebyshev active-RC complex filter for a low-IF ultra-low-power receiver is presented. By utilising a polecancellation 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 μW 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.
- Subjects
CHEBYSHEV filters; ELECTRIC power consumption; BANDWIDTH allocation; COMPLEMENTARY metal oxide semiconductors; NONLINEAR optical susceptibility
- Publication
Electronics Letters (Wiley-Blackwell), 2013, Vol 49, Issue 1, p51
- ISSN
0013-5194
- Publication type
Article
- DOI
10.1049/el.2012.3690