Question

The equivalent circuit for Cx is a series RCL circuit

The circuit below was constructed and the voltage across Cy measured with an oscilloscope. The measurement is shown below the circuit. The capacitor has a nominal capacitance of 22uF. The square wave from the signal generator has an amplitude of 10V and the rise and fall times of 10ns. Determine an equivalent circuit for the capacitor with component values. 5022 7 C Oscilloscope Signal generator 300mV 200mV 100mVA ffffffffffffffffffff Omy - 100mV IIIIIII IIIIIII -200mV -300mv 50ns 100ns 150ns 200ns 300ns 350ns 400ns 450ns 500ns 250ns Time

Answer 1

From the circut rise time =10ns

Rise time t​​​​​​r=2.2RCx

Cx​​​​​=t​​​​​​r/(2.2R)

=10x10-9/(2.2x50)

=90.90x10-12F

=90.90pF

R=50 ohm. Capacitor C​​​​​​x​​​​​=90.90pF