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 b...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 m CMOS process. It exhibits a wide programmable bandwidth from 322.5 k Hz to20 MHz. Measured results show that the filter has low input referred noise of 5.9 n V/（Hz）^（1/2） and high out-of-band IIP3 of 16.2 d Bm. It consumes 4.2 and 9.5 m W from a 1 V power supply at its lowest and highest cut-off frequencies respectively.展开更多
A generally improved recycling folded cascode（IRFC） is analyzed and implemented.Analysis and comparisons among the IRFC,the original recycling folded cascode（RFC） and the conventional folded cascode （FC） are mad...A generally improved recycling folded cascode（IRFC） is analyzed and implemented.Analysis and comparisons among the IRFC,the original recycling folded cascode（RFC） and the conventional folded cascode （FC） are made,and it is shown that with the flexible structure of IRFC,significant enhancement in transconductance, slew rate and noise can be achieved.Prototype amplifiers were fabricated in 0.13μm technology.Measurement shows that IRFC has 3×enhancement in gain-bandwidth and slew rate over conventional FC,and the enhancement is 1.5x when compared with the RFC.展开更多
基金Project supported by the National Natural Science Foundation of China(No.61574045)
文摘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 m CMOS process. It exhibits a wide programmable bandwidth from 322.5 k Hz to20 MHz. Measured results show that the filter has low input referred noise of 5.9 n V/（Hz）^（1/2） and high out-of-band IIP3 of 16.2 d Bm. It consumes 4.2 and 9.5 m W from a 1 V power supply at its lowest and highest cut-off frequencies respectively.
基金supported by Important National Science and Technology Specific Projects of China(No.2009ZX01031-003-002)the National High Technology Research and Development Program of China(No.2009AA011605)the Important National Science & Technology Specific Projects of China(No.2010ZX03001-004)
文摘A generally improved recycling folded cascode（IRFC） is analyzed and implemented.Analysis and comparisons among the IRFC,the original recycling folded cascode（RFC） and the conventional folded cascode （FC） are made,and it is shown that with the flexible structure of IRFC,significant enhancement in transconductance, slew rate and noise can be achieved.Prototype amplifiers were fabricated in 0.13μm technology.Measurement shows that IRFC has 3×enhancement in gain-bandwidth and slew rate over conventional FC,and the enhancement is 1.5x when compared with the RFC.
