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本文提出了一种基于平衡态的动态比较器失调电压分析设计技术。以两支路电压电流相等的平衡态为分析基础,通过在复位电压跳变时刻引入补偿电压的方法,逐一分析了动态比较器各晶体管参数对总体失调电压的影响,建立了失调电压的数学模型;采用Chartered 0.18um1P6M工艺对Lewis-Gray型动态比较器进行了电路和版图设计,并利用可快速提取失调电压的定步长仿真方法对其失调电压进行了仿真,结果表明所提出的分析方法可以相对准确的估算失调电压。以该分析方法为基础,本文还提出一种基于总体失调电压影响权重的晶体管分组优化方法,在保证总体面积不变的条件下,可将失调电压有效降低50%以上。经流片测试结果表明,本文所提出的分析和优化方法可应用于高速高精度系统中比较器的设计。 相似文献
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一种应用于CMOS图像传感器中的线性步进PGA设计 总被引:1,自引:0,他引:1
A low power linear stepping digital programming gain amplifier (PGA) is designed for CMOS image sensors. The PGA consists of three stages with gain range from one to nine, The gain is divided into four regions and each range has 128 linear steps. Power consumption of the PGA is saved by good tradeoff between variation of amplifier feedback coefficient, pipeline stages and gain regions. With thermometer-binary mixed coding and linear pipeline gain stepping, the load capacitance keeps constant when the gain of one stage is changed. The PGA is designed in the SMIC 0.18 μm process. Simulation results show that the power consumption is 3.2 mW with 10 bit resolution and 10 MSPS sampling rate. The PGA has been embedded in a 0.3 megapixel CMOS image sensors and fabricated successfully. 相似文献
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A low power linear stepping digital programming gain amplifier (PGA) is designed for CMOS image sensors. The PGA consists of three stages with gain range from one to nine. The gain is divided into four regions and each range has 128 linear steps. Power consumption of the PGA is saved by good tradeoff between variation of amplifier feedback coefficient, pipeline stages and gain regions. With thermometer-binary mixed coding and linear pipeline gain stepping, the load capacitance keeps constant when the gain of one stage is changed. The PGA is designed in the SMIC 0.18μm process. Simulation results show that the power consumption is 3.2 mW with 10 bit resolution and 10 MSPS sampling rate. The PGA has been embedded in a 0.3 megapixel CMOS image sensors and fabricated successfully. 相似文献
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工程量清单和企业定额 总被引:12,自引:0,他引:12
一、工程量清单计价现阶段地位和实施过程中的存在问题工程量清单报价法 ,是由发包人统一计算工程量并反映在的报价清单内 ,在这个基础上 ,由各企业自行制定每个分项目的综合单价。实行工程量清单报价 ,其目的很明显是为了打破过去那种由政府的造价管理部门统一单价的做法 ,让施工企业能发挥自己的价格和技术优势 ,推动竞争 ,在竞争中形成市场。是招投标制度和造价管理与国际惯例接轨过程中要经过的必然阶段。但是 ,由于大多数施工企业未能形成自己的企业定额 ,在制定综合单价时 ,多是按照地区定额内各相应子目的工料消耗量 ,乘以自己在支付… 相似文献
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