Analog Multiplier Circuit Using Op Amp

By | February 1, 2023

Analog Multiplier Circuit Using Op Amp

An analog multiplier circuit is a device that multiplies two analog signals together. It is a basic building block in many electronic systems, and it can be used for a variety of applications, such as signal processing, control systems, and audio amplification.

The most common type of analog multiplier circuit is the Gilbert multiplier, which is named after its inventor, Bernard Gilbert. The Gilbert multiplier uses two operational amplifiers (op amps) to perform the multiplication operation.

The basic operation of the Gilbert multiplier is shown in the following diagram. The two input signals, Vin1 and Vin2, are applied to the two inputs of the first op amp. The output of the first op amp is then fed to the inverting input of the second op amp. The non-inverting input of the second op amp is connected to a reference voltage, Vref.

The output of the second op amp is the product of the two input signals, multiplied by the gain of the second op amp. The gain of the second op amp can be adjusted by changing the value of the resistor R2.

The Gilbert multiplier is a very versatile circuit that can be used for a variety of applications. It is a relatively simple circuit to design and build, and it is very accurate. However, the Gilbert multiplier does have some disadvantages. One disadvantage is that it consumes a relatively large amount of power. Another disadvantage is that it is not very linear, which means that the output signal is not a perfect reproduction of the input signals.

Despite these disadvantages, the Gilbert multiplier is a very useful circuit that is used in a wide variety of electronic systems.

Applications of Analog Multiplier Circuits

Analog multiplier circuits can be used for a variety of applications, including: * Signal processing * Control systems * Audio amplification * Analog-to-digital conversion * Digital-to-analog conversion * Phase-locked loops * Frequency synthesizers * Voltage-controlled oscillators

Conclusion

Analog multiplier circuits are a basic building block in many electronic systems. They are relatively simple to design and build, and they can be used for a variety of applications. However, it is important to be aware of the limitations of analog multiplier circuits, such as their relatively high power consumption and non-linearity.

References

* [Gilbert Multiplier](https://en.wikipedia.org/wiki/Gilbert_multiplier)


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