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An operational amplifier is a key building block in various analog functions. In a broad class of analog circuits with a high dynamic range, the signal degradation is directly related to the limited gainbandwidth (GBW) of the amplifiers. For example, increasing the GBW of an amplifier increases the loop gain and therefore the distortion performance. Therefore, low-distortion amplifiers require a GBW which is much larger than the signal frequency. An other example is an oversampled data converter: increasing the GBW allows to increase the Oversampling Ratio which benefits the signal- to-noise ratio. In many applications, amplifiers with a large GBW are required, although the signal frequencies can be relatively small. |
