TOPIC 5 : Low-Frequency Capacitive Coupling Model
Low-Frequency Capacitive Coupling Model Capacitive Coupling at Low Frequencies When the condition 1 ω C 12 ≫ R 2 \frac{1}{\omega C_{12}} \gg R_2 ω C 12 ≫ R 2 holds, capacitive coupling can be modeled as a current source . Equivalent Circuit Model The initial circuit includes a coupling capacitance C 12 C_{12} , a ground capacitance C 2 g C_{2g} , and a load resistance R 2 R_2 This model can be simplified by considering the capacitive divider effect. Further Approximation In many cases, if 1 ω ( C 12 + C 2 g ) ≫ R 2 \frac{1}{\omega (C_{12} + C_{2g})} \gg R_2 ω ( C 12 + C 2 g ) 1 ≫ R 2 holds, the circuit can be reduced to a current source proportional to the capacitive coupling C 12 C_{12} , injecting current into the second circuit. 4. Practical Implications At low frequencies, the electric-field coupling is effectively represented by a current source. The amplitude of the coupled current...