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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MICRF112 датащи(PDF) 15 Page - Micrel Semiconductor |
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MICRF112 датащи(HTML) 15 Page - Micrel Semiconductor |
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15 / 20 page  Micrel, Inc. MICRF112 December 2011 15 M9999-120911 (408) 944-0800 Output Matching Network Part of the function of the output network is to attenuate the second and third harmonics. When matching to a transmit frequency, care must be taken not only to optimize for maximum output power but to attenuate unwanted harmonics. Layout Issues PCB Layout is of primary concern to achieve optimum performance and consistent manufacturing results. Care must used on orientation of components to ensure they do not couple or decouple the RF signal. PCB trace length should be short to minimize parasitic inductance, (1 inch ~ 20nH). For example, depending on inductance values, a 0.5 inch trace can change the inductance by as much as 10%. To reduce parasitic inductance, the use of wide traces and a ground plane under signal traces is recommended. Vias with low value inductance should be used for components requiring a connection-to-ground. Antenna Layout Directivity is affected by antenna trace layout. No ground plane should be under the antenna trace. For consistent performance, components should not be placed inside the loop of the antenna. Gerbers for Figure 7, with a suggested layout, can be obtained on the Micrel web site at: http://www.micrel.com. |
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