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A low power 8th order elliptic low-pass filter for a CMMB tuner

A low power 8th order elliptic low-pass filter for a CMMB tuner
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摘要 This paper presents an 8th order active-RC elliptic low-pass filter（LPF） for a direct conversion China Mobile Multimedia Broadcasting（CMMB） tuner with a 1 or 4 MHz -3 dB cutoff frequency（f_（-3dB））.By using a novel gain-bandwidth-product（GBW） extension technique in designing the operational amplifiers（op-amps）, the proposed filter achieves 71 dB stop-band rejection at 1.7f_（-3dB） to meet the stringent CMMB adjacent channel rejection（ACR） specifications while dissipates only 2.8 mA/channel from a 3 V supply,its bias current can be further lowered to 2 mA/channel with only 0.5 dB peaking measured at the filter＇s pass-band edge.Elaborated common-mode（CM） control circuits are applied to the filter op-amp to increase its common-mode rejection ratio （CMRR） and effectively reject the large signal common-mode interference.Measurement results show that the filter has 128 dBμV_（rms） in-band IIP3 and more than 80 dB passband CMRR.Fabricated in a 0.35-μm SiGe BiCMOS process,the proposed filter occupies a 1.19 mm^2 die area. This paper presents an 8th order active-RC elliptic low-pass filter（LPF） for a direct conversion China Mobile Multimedia Broadcasting（CMMB） tuner with a 1 or 4 MHz -3 dB cutoff frequency（f_（-3dB））.By using a novel gain-bandwidth-product（GBW） extension technique in designing the operational amplifiers（op-amps）, the proposed filter achieves 71 dB stop-band rejection at 1.7f_（-3dB） to meet the stringent CMMB adjacent channel rejection（ACR） specifications while dissipates only 2.8 mA/channel from a 3 V supply,its bias current can be further lowered to 2 mA/channel with only 0.5 dB peaking measured at the filter＇s pass-band edge.Elaborated common-mode（CM） control circuits are applied to the filter op-amp to increase its common-mode rejection ratio （CMRR） and effectively reject the large signal common-mode interference.Measurement results show that the filter has 128 dBμV_（rms） in-band IIP3 and more than 80 dB passband CMRR.Fabricated in a 0.35-μm SiGe BiCMOS process,the proposed filter occupies a 1.19 mm^2 die area.
作者 龚正 陈备 胡雪青 石寅 代伐
机构地区 Institute of Semiconductors Department of Electrical and Computer Engineering
出处 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2011年第9期82-88,共7页 半导体学报（英文版）
关键词 CMMB tuner IC continuous-time filter active-RC filter low power analog filter gain-bandwidth-product extension CMRR CMMB tuner IC continuous-time filter active-RC filter low power analog filter gain-bandwidth-product extension CMRR
分类号 TN713.4 [电子电信—电路与系统]
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参考文献9

  • 1Kim S, Kim B, Jeong M S, et al. A 43 dB ACR low-pass tilter with automatic tuning for low-IF conversion DAB/T-DMB tuner IC. Proc Eur Solid State Circuits Conf (ESSCIRC), 2005:319.
  • 2Notten M, Brekelmans H, Rambeau V. A 5th order 14 mWatt active polyphase filter for analog and digital TV on mobile applications. Proc Eur Solid State Circuits Conf(ESSCIRC), 2006: 211.
  • 3Kousai S, Hamada M, lto R, et al. A 19.7 MHz, fifth-order active-RC Chebyshev LPF for draft IEEE802.11 n with automatic quality-factor tuning scheme. IEEE J Solid-State Circuits, 2007, 42(11): 2326.
  • 4Harrison J, Weste N. A 500 MHz CMOS anti-alias filter using feed-forward op-amps with local common-mode feedback. I E E E Int Solid-State Circuit Conf Dig Tech Papers, 2003:132.
  • 5Tsividis Y R Integrated continuous-time filter design an overview. IEEE J Solid-State Circuits, 1994, 29:166.
  • 6Wan P, Chiu Y, Lin P. A 5.8-mW, 20-MHz, 4th-order programmable elliptic filter achieving over -800 dB IM3. Proc CICC, 2010:1.
  • 7Fast Compensation Extends Power Bandwidth, National Semiconductor Linear Brief 4, Apt 1969.
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  • 9Hollman T, Lindfors S, Lansirinne M, et al. A 2.7-V CMOS dualmode baseband filter for PDC and WCDMA. IEEE J Solid-State Circuits, 2001, 36:1148.
Journal of Semiconductors
2011年 第9期

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