Fig. 1.
Proposed OTA circuit with local feedback
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| Citation: |
Yu Wang, Jing Liu, Na Yan, Hao Min. A low-noise widely tunable Gm-C filter with frequency calibration[J]. Journal of Semiconductors, 2016, 37(9): 095002. doi: 10.1088/1674-4926/37/9/095002
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Y Wang, J Liu, N Yan, H Min. A low-noise widely tunable Gm-C filter with frequency calibration[J]. J. Semicond., 2016, 37(9): 095002. doi: 10.1088/1674-4926/37/9/095002.
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A low-noise widely tunable Gm-C filter with frequency calibration
DOI: 10.1088/1674-4926/37/9/095002
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Abstract
A fourth-order Gm-C Chebyshev low-pass filter is presented as channel selection filter for reconfigurable multi-mode wireless receivers. Low-noise technologies are proposed in optimizing the noise characteristics of both the Gm cells and the filter topology. A frequency tuning strategy is used by tuning both the transconductance of the Gm cells and the capacitance of the capacitor banks. To achieve accurate cut-off frequencies, an on-chip calibration circuit is presented to compensate for the frequency inaccuracy introduced by process variation. The filter is fabricated in a 0.13 μm CMOS process. It exhibits a wide programmable bandwidth from 322.5 kHz to 20 MHz. Measured results show that the filter has low input referred noise of 5.9 nV/√Hz and high out-of-band ⅡP3 of 16.2 dBm. It consumes 4.2 and 9.5 mW from a 1 V power supply at its lowest and highest cut-off frequencies respectively. -
References
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