用于14位210 MS/s電荷域ADC的采樣保持前端電路
doi: 10.11999/JEIT180337
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1.
黃山學(xué)院信息工程學(xué)院 ??黃山 ??245041
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2.
中國電子科技集團第五十八研究所 ??無錫 ??214035
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3.
西安電子科技大學(xué)微電子學(xué)院 ??西安 ??710071
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4.
西安交通大學(xué)微電子學(xué)院 ??西安 ??710049
Sample and Hold Front-end Circuit for 14-bit 210 MS/s Charge-domain ADC
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1.
School of Information Engineering, Huangshan University, Huangshan 245041, China
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2.
No.58 Research Institute, China Electronic Technology Group Corporation, Wuxi 214035, China
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3.
Microelectronic Institute, Xidian University, Xi’an 710071, China
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4.
School of Microelectronic, Xi’an Jiaotong University, Xi’an 710049, China
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摘要:
該文提出一種用于電荷域流水線模數(shù)轉(zhuǎn)換器(ADC)的高精度輸入共模電平不敏感采樣保持前端電路。該采樣保持電路可對電荷域流水線ADC中由輸入共模電平誤差引起的共模電荷誤差進行補償。所提出的高精度輸入共模電平不敏感采樣保持電路被運用于一款14位210 MS/s電荷域ADC中,并在1P6M 0.18 μm CMOS工藝下實現(xiàn)。測試結(jié)果顯示,該14位ADC電路在210 MS/s條件下對于30.1 MHz單音正弦輸入信號得到的無雜散動態(tài)范圍為85.4 dBc,信噪比為71.5 dBFS,而ADC內(nèi)核功耗僅為205 mW,面積為3.2 mm2。
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關(guān)鍵詞:
- 流水線模數(shù)轉(zhuǎn)換器 /
- 電荷域 /
- 采樣保持 /
- 低功耗 /
- 共模電荷
Abstract:A high precision common mode level insensitive sample and hold front-end circuit for charge domain pipelined Analog-to-Digital Converter (ADC) is proposed. The sample and hold circuit can be used to compensate the common mode charge errors caused by the variation of input common mode level in charge domain pipelined ADCs. Based on the proposed sample and hold circuit, a 14-bit 210 MS/s charge domain pipelined ADC is designed and realized in a 1P6M 0.18 μm CMOS process. Test results show the 14-bit 210 MS/s ADC achieves the signal-to-noise ratio of 71.5 dBFS and the spurious free dynamic range of 85.4 dBc, with 30.1 MHz input single tone signal at 210 MS/s, while the ADC core consumes the power consumption of 205 mW and occupies an area of 3.2 mm2.
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表 1 ADC性能對比
技術(shù)指標(biāo) 精度
(bit)采樣
(MS/s)SNR
(dB)SFDR
(dB)電源電壓
(V)工藝
(nm)內(nèi)核功耗
(mW)內(nèi)核面積
(mm2)FOM(pJ/step)
功耗/(${{2}^{{\rm{ENOB}}}} \cdot {\rm{f}}$clk)文獻[4] 14 500 64.8 92.7 1.8/3.3 180 550 2.5** 0.71 文獻[5] 14 1000 69.0 86.0 1.2/2.5 65 1200 5.0 0.55 文獻[15] 14 200 68.5 88.5 1.8 180 460 22.5* 1.07 文獻[16] 14 250 68.5 94.7 1.8 180 300 3.6 0.57 本文 14 210 71.5 85.4 1.8 180 205 3.2 0.39 注:*該ADC為時間交織結(jié)構(gòu);**該ADC采用SiGe BiCMOS工藝 下載: 導(dǎo)出CSV
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