# Circuit Simulator - Capacitance Multiplier

#### Why should I learn to use the circuit simulator to design Capacitance Multiplier circuits?

Learn how to use circuit simulator software to design your own Capacitance Multiplier circuits.

#### Where can I get a Capacitance Multiplier circuit diagram with an explanation?

IndiaBIX provides numerous Capacitance Multiplier circuit diagrams with detailed explanations and working principles.

#### How do I design a Capacitance Multiplier circuit with this circuit simulator?

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

Capacitance Multiplier

Circuit Description:

The circuit on top uses an op-amp and a small capacitor to simulate a much larger capacitor. It simulates the circuit on the bottom; the resistor R2 is the same size as the resistor in the circuit being simulated (R3), but the capacitor C1 is 100 times smaller than C2.

Current flows from the input source through R1 to the capacitor (C1). Since R1 is 100 times larger than R2, there is 1/100th the current through it into the capacitor. For a given input voltage, the rate of change in voltage in C1 is the same as in C2, because C2 has 100 times the capacitance to make up for 1/100th the current.

So the voltages across the two capacitors are the same, but the currents are not. The op-amp causes the – input to be held at the same voltage as the voltage across C1. This means R2 has the same voltage across it as R3, and therefore the same current.

Current flows from the input source through R1 to the capacitor (C1). Since R1 is 100 times larger than R2, there is 1/100th the current through it into the capacitor. For a given input voltage, the rate of change in voltage in C1 is the same as in C2, because C2 has 100 times the capacitance to make up for 1/100th the current.

So the voltages across the two capacitors are the same, but the currents are not. The op-amp causes the – input to be held at the same voltage as the voltage across C1. This means R2 has the same voltage across it as R3, and therefore the same current.

Discussion:

1 comments Page 1 of 1.
Mike said:
8 years ago

Hi.

I was just wondering,

Does the other terminal of the signal source connect to ground,

And, does the op amp need a load resistor between the output and ground to provide a current return path back to the signal source, I can't see how the higher current running through the feedback circuit gets back to signal source.

Thanks.

I was just wondering,

Does the other terminal of the signal source connect to ground,

And, does the op amp need a load resistor between the output and ground to provide a current return path back to the signal source, I can't see how the higher current running through the feedback circuit gets back to signal source.

Thanks.

(2)

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