# Circuit Simulator - Negative Impedance Converter

#### Why should I learn to use the circuit simulator to design Negative Impedance Converter circuits?

Learn how to use circuit simulator software to design your own Negative Impedance Converter circuits.

#### Where can I get a Negative Impedance Converter circuit diagram with an explanation?

IndiaBIX provides numerous Negative Impedance Converter circuit diagrams with detailed explanations and working principles.

#### How do I design a Negative Impedance Converter circuit with this circuit simulator?

You can easily design Negative Impedance Converter circuit diagrams by practising with the given circuit simulator. With this online circuit simulator, you can design and simulate your own electronic circuits.

Negative Impedance Converter

Circuit Description:

The circuit on the left converts a positive impedance to a negative impedance. So, for example, instead of Ohm's Law (E=IR) it causes a resistor to obey E=-IR. The circuit on the right shows a positive impedance (a 150 ohm resistor) for comparison.

The op-amp attempts to keep its – input at the same voltage as the + input, which is connected to the input signal. So the impedance being transformed (a 150 ohm resistor) responds as if it were connected directly to the input signal. Whatever current it needs is sourced by the op-amp and flows through the bottom 100 ohm resistor.

Since the + input is at the same voltage as the – input, the current and voltage drop across the top 100 ohm resistor must be the same as the bottom one. As a result, when the input voltage is positive, current is flowing into the input rather than out of it. The input current is the same as the current through the impedance, but in the opposite direction.

The op-amp attempts to keep its – input at the same voltage as the + input, which is connected to the input signal. So the impedance being transformed (a 150 ohm resistor) responds as if it were connected directly to the input signal. Whatever current it needs is sourced by the op-amp and flows through the bottom 100 ohm resistor.

Since the + input is at the same voltage as the – input, the current and voltage drop across the top 100 ohm resistor must be the same as the bottom one. As a result, when the input voltage is positive, current is flowing into the input rather than out of it. The input current is the same as the current through the impedance, but in the opposite direction.

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