A 1.9GHz down-conversion CMOS mixer with a novel folded Gilbert cell,intended for use in GSM1900 （PCS1900） low-IF receivers,is fabricated in a RF 0.18μm CMOS process. The prototype demonstrates good performance at ...A 1.9GHz down-conversion CMOS mixer with a novel folded Gilbert cell,intended for use in GSM1900 （PCS1900） low-IF receivers,is fabricated in a RF 0.18μm CMOS process. The prototype demonstrates good performance at an intermediate frequency of 100kHz. It achieves a conversion gain of 6dB, SSB noise figure of 18. 5dB （1MHz IF） ,and IIP3 11.5dBm while consuming a 7mA current from a 3.3V power supply.展开更多
An improved inductor layout with non-uniform metal width and non-uniform spacing is proposed to increase the quality factor（Q factor）.For this inductor layout,from outer coil to inner coil,the metal width is reduced...An improved inductor layout with non-uniform metal width and non-uniform spacing is proposed to increase the quality factor（Q factor）.For this inductor layout,from outer coil to inner coil,the metal width is reduced by an arithmetic-progression step,while the metal spacing is increased by a geometric-progression step. An improved layout with variable width and changed spacing is of benefit to the Q factor of RF spiral inductor improvement（approximately 42.86%）,mainly due to the suppression of eddy-current loss by weakening the current crowding effect in the center of the spiral inductor.In order to increase the Q factor further,for the novel inductor, a patterned ground shield is used with optimized layout together.The results indicate that,in the range of 0.5 to 16 GHz,the Q factor of the novel inductor is at an optimum,which improves by 67%more than conventional inductors with uniform geometry dimensions（equal width and equal spacing）,is enhanced by nearly 23%more than a PGS inductor with uniform geometry dimensions,and improves by almost 20%more than an inductor with an improved layout.展开更多
文摘A 1.9GHz down-conversion CMOS mixer with a novel folded Gilbert cell,intended for use in GSM1900 （PCS1900） low-IF receivers,is fabricated in a RF 0.18μm CMOS process. The prototype demonstrates good performance at an intermediate frequency of 100kHz. It achieves a conversion gain of 6dB, SSB noise figure of 18. 5dB （1MHz IF） ,and IIP3 11.5dBm while consuming a 7mA current from a 3.3V power supply.
基金Project supported by the National Natural Science Foundation of China(Nos60776051,61006059,61006044)the Beijing Municipal Natural Science Foundation,China(No4082007)+2 种基金the Science Scientific Research Common Program of Beijing Municipal Commission of Education,China (NosKM200710005015,KM200910005001)the Beijing Municipal Trans-Century Talent Project,China(No 67002013200301)the Funding Project of State Scholarship,China(No2010654003)
文摘An improved inductor layout with non-uniform metal width and non-uniform spacing is proposed to increase the quality factor（Q factor）.For this inductor layout,from outer coil to inner coil,the metal width is reduced by an arithmetic-progression step,while the metal spacing is increased by a geometric-progression step. An improved layout with variable width and changed spacing is of benefit to the Q factor of RF spiral inductor improvement（approximately 42.86%）,mainly due to the suppression of eddy-current loss by weakening the current crowding effect in the center of the spiral inductor.In order to increase the Q factor further,for the novel inductor, a patterned ground shield is used with optimized layout together.The results indicate that,in the range of 0.5 to 16 GHz,the Q factor of the novel inductor is at an optimum,which improves by 67%more than conventional inductors with uniform geometry dimensions（equal width and equal spacing）,is enhanced by nearly 23%more than a PGS inductor with uniform geometry dimensions,and improves by almost 20%more than an inductor with an improved layout.
