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版图设计中的匹配.ppt

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Match & Noise PIT E L 蒋苓利 2022-6-5
Devices for match: 电流镜(MOS、电阻) 用于分压的电阻(AD/DA) 用于电流比例设定的电阻 差分对 电压/电流基准源 用于运放加/减比例设置的电阻 ……
Rules for match: Place devices close to each other Keep the device in the same orientation Device in the same size Choose a middle value for root component Interdigitating device Common centroid & Symmetry Dummy device for over-etching Match the parasitic parameter
Rules for match Place devices close to each other Upper Limit y1 y2 Lower Limit x1 x2 x,y x- x , y+ y x+ x , y- y • The closer between the two components, the more similar for these two components. • In the small region, the characteristic curve can be viewed as “linear”. • The distance between the devices should be the same.
Rules for match Keep the device in the same orientation 标准尺寸: 20/5 横向放置 20/4
Rules for match Device in the same size Two in series Two in parallel Four in parallel
Rules for match Choose a middle value for root component Match for R1=4k R2=16k Which one is better?
Rules for match Choose a middle value for root component 阻值居中 长度、宽度在精度范围内 所占面积最小 经验值(0.5um): 宽度: 最窄2um,仅用于无需任何阻值精度要求的大电阻 普通匹配3~4um 高精度匹配5~6um 长度: 有精度要求者,方块值最好在6个以上 50~60um左右为佳,太长易断
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