Transcription of Section 5 High Speed PCB Layout Techniques
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Section 5 High Speed PCB Layout Techniques
High Speed Analog Design and Application Seminar5-1 Texas InstrumentsSection 5 High Speed PCB Layout TechniquesScenario: You have spent several days, no maybe weeks, perfecting adesign on paper and also using Spice to ensure the design exceeds allexpectations. You hand the schematic to your Layout person who puts alleverything on a printed circuit board (PCB). The PCB comes back in a weekor two and is finally populated and ready to test. But it doesn t work!!!!Why not? On paper it works!! Spice said it works!
Solutions: Amplifier is next to Connector minimizing loop area. HF bypass caps are now placed next to amplifier power supply pins and has short GND connection. GND of bypass caps near amplifier output – but not too close to cause C-loading issues. Source Resistance is next to amplifier output. Multiple GND points on connector. R SOURCE +V S-V S
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