US Patent 7,791,353 B2
Introduction
Simple Circuit Concepts
Transmission lines
Faraday's law
Near and far fields
Spurious coupling mechanisms
- Direct conduction
- Capacitive coupling -problem
- Capacitive coupling -fixing
- Inductive coupling-problem
- Inductive coupling -fixing by twisted
- Inductive coupling -fixing by coax
- Electromagnetic pickup
- Examples
- Safety & star grounding
- Gnd loop resistance, inductance
- Low frequency behavior
- High frequency behavior
- Troubleshooting
- Methods for removing
Capacitive coupling: fixing
Capacitively coupled currents can be rendered harmless by shielding the signal wire as in Fig. 6. Shielding means enveloping the signal wire by a conductor connected to common; this shield may be the return conductor or it may a separate shroud that is external to the return conductor. Instead of flowing in the signal wire the capacitively coupled current flows to common through the shield and so does not interfere with the signal. The shield acts like a gutter.
Capacitively coupled currents can be rendered harmless by shielding the signal wire as in Fig. 6. Shielding means enveloping the signal wire by a conductor connected to common; this shield may be the return conductor or it may a separate shroud that is external to the return conductor. Instead of flowing in the signal wire the capacitively coupled current flows to common through the shield and so does not interfere with the signal. The shield acts like a gutter.
Find ground loops fast!
-eliminate electical interference, fix star grounding
-eliminate electical interference, fix star grounding
US Patent 7,791,353 B2
Fig. 6 Shield surrounds signal wire. Capacitively coupled spurious current (red) drains through shield to common without contaminating signal (green).
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