Issue link: https://iconnect007.uberflip.com/i/1359517
48 DESIGN007 MAGAZINE I APRIL 2021 back exactly the responses shown (Figure 4). We can take the re-balanced circuit with 10 nH inductance and 25 mF capacitance as the new baseline and find out what happens if the inductance is increased further, from 10 nH to 1000 nH, or 1 mH. A 1 mH inductance could represent a one-meter-long wire-pair con- necting our circuit to a bench supply. Since we changed several items along the way, in Figure 6 we capture the schematics and in Figure 7 we show the result. Note the expanded horizon- tal scale on the transient response: the 30 kHz peak in the impedance profile creates a huge ringing. If this was a real circuit, the voltage actually would swing negative for a short time. We already know how to fix this: To balance a 1 mH inductance at 20 mOhm impedance level, we need 2500 uF capacitance. In a real Figure 6: The circuit of Figure 3 with 1000 nH inductance and 25 mF capacitance. Figure 7: Impedance profile (on the left) and transient response (on the right) of the circuit in Figure 6.