Op-amps are just simple amplifiers, so why should they be limited by frequency? It would be surprising to know that op-amps have a built-in feedback network that limits the gain at high frequencies, and for good reason. Such a plot is often accompanied by a plot for phase too since there is a delay between the input being applied and the output being interpreted as a change in phase, which makes it useful for mathematical analysis. When we plot a graph, the x-axis value represents the input frequency, and the y-axis value is the ratio of output to input. When we feed it an input signal that sweeps from DC to a certain frequency, we get a graph of the ratio of the input to the output (measured in decibels) that looks like this:īandwidth analysis is done in the frequency domain, that is, the x-axis no longer represents time but the frequency. For example, a simple low pass filter, like its name suggests, allows only low frequencies to pass through. However, Op-amps are not infallible – they come with their own set of limitations which must be taken into account when working with them, and the most important parameter is bandwidth.Įvery circuit has a specific frequency response, which describes how a circuit responds to different frequencies. You can find them performing a wide range of functions such as amplification, filtering, comparing, and performing mathematical operations among others. Op-amps are the mainstay of analog electronics.
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