Quick question about operational amplifiers

In summary, an opamp is primarily a voltage amplifier and the gain can be adjusted with negative feedback. Reactive components can be used to create filters with frequency-dependent gain. This information is helpful for understanding AC inputs in circuit analysis.
  • #1
EEInProgress
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Homework Statement


Does a noninverting operational amplifier amplify the frequency of an input, ex. a 2 kHz square wave of amplitude 100mV peak-peak, or just the voltage?
 
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  • #2
EEInProgress said:

Homework Statement


Does a noninverting operational amplifier amplify the frequency of an input, ex. a 2 kHz square wave of amplitude 100mV peak-peak, or just the voltage?

Welcome to the PF.

In general, opamps are voltage amplifiers. You use negative feedback to set the overall gain of the circuit. If you use reactive components (caps and/or inductors), you can make the gain a function of frequency. That is how you make lowpass filters (LPFs), highpass filters (HPFs), bandpass filters (BPFs), etc.

Does that help?
 
  • #3
Yea, I just needed a confirmation. Been doing DC circuits in my circuit class, and then I come across questions concerning AC inputs and wasn't sure about the frequency. Thanks for the quick reply :)
 

1. What is an operational amplifier?

An operational amplifier, or op-amp, is an electronic device that amplifies the voltage difference between its two input terminals. It is commonly used in various electronic circuits, such as amplifiers and filters.

2. What is the purpose of an operational amplifier?

The main purpose of an operational amplifier is to amplify the voltage difference between its two input terminals. This allows it to perform mathematical operations, such as addition, subtraction, and integration, which are useful in electronic circuits.

3. What are the basic components of an operational amplifier?

An operational amplifier typically consists of three main components: an inverting input, a non-inverting input, and an output. It also has a power supply and additional components, such as resistors and capacitors, to control its operation.

4. How do operational amplifiers work?

Operational amplifiers work by amplifying the voltage difference between their two input terminals, according to the gain of the op-amp. This gain can be adjusted by changing the values of the external components connected to the op-amp. The output voltage is typically much larger than the input voltage.

5. What are some common applications of operational amplifiers?

Operational amplifiers have a wide range of applications in electronic circuits. Some common uses include as voltage amplifiers, audio amplifiers, filters, and oscillators. They are also used in instrumentation and control systems, as well as in signal processing and signal conditioning applications.

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