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

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 amplifier...

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Bibliographic Details
Published inJournal of semiconductors Vol. 32; no. 9; pp. 82 - 88
Main Author 龚正 陈备 胡雪青 石寅 代伐
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.09.2011
Subjects
BiCMOS工艺
Channels
CMRR
Multimedia
Noise levels
Rejection
Semiconductors
Silicon germanides
Specifications
Tuners
低功耗
椭圆低通滤波器
测量滤波器
移动多媒体
调谐器
运算放大器
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ISSN1674-4926
DOI10.1088/1674-4926/32/9/095002

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Summary: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.
Bibliography:Gong Zheng~（1,＋）,Chen Bei~1,Hu Xueqing~1,Shi Yin~1, and Dai Fa Foster~2 1 Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China 2 Department of Electrical and Computer Engineering,Auburn University,Auburn,AL 36849-5201,USA
11-5781/TN
CMMB tuner IC; continuous-time filter; active-RC filter; low power analog filter; gain-bandwidth-product extension; CMRR
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.
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ISSN:1674-4926
DOI:10.1088/1674-4926/32/9/095002