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器件3D模型￥ 27.603
MAX2623EUA 产品设计参考手册 - Maxim Integrated（美信）
制造商:
Maxim Integrated（美信）
分类:
RF模块、IC及配件
封装:
TSSOP-8
描述:
单片压控振荡器 Monolithic Voltage-Controlled Oscillators
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
MAX2623EUA数据手册
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若手册格式错乱，请下载阅览PDF原文件
Figure 3. Offset suspended stripline. A variant of the stripline, for PCBs with unequal layer thicknesses (end view).
Coplanar Waveguide (Grounded)
A coplanar waveguide provides for better isolation between nearby RF lines, as well as other signal lines (end view).
This medium consists of a center conductor with ground planes on either side and below (Figure 4).
Figure 4. A coplanar waveguide provides for better isolation between nearby RF lines and other signal lines.
Via "fences" are recommended on both sides of a coplanar waveguide, as shown in Figure 5. This top view provides
an example of a row of ground vias on each top metal gound plane on either side of the center conductor. Return
currents induced on the top layer are shorted to the underlying ground layer.
Figure 5. Via fences are recommended on both sides of a coplanar waveguide.
Characteristic Impedance
There are several calculators available to properly set the signal conductor line width to achieve the target
impedance. However, caution should be used when entering the dielectric constant of the layers. The outer
laminated layers of typical PCBs often contain less glass content than the core of the board, and consequently the
dielectric constant is lower. For example, FR4 core is generally given as ε
R
= 4.2, whereas the outer laminate
(prepreg) layers are typically ε
R
= 3.8. Examples given below for reference only, metal thickness assumed for 1oz
copper (1.4 mils, 0.036mm).
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