What is the gain-bandwidth of an operational amplifier?

The gain-bandwidth product (GBP) is a fundamental specification of an operational amplifier. It represents the frequency at which the amplifier's open-loop gain drops to exactly one (unity, or 0 dB). Because the product of gain and bandwidth is relatively constant in a real-world op-amp, you can use the GBP to calculate the maximum available bandwidth for a given closed-loop gain. For example, if an op-amp has a GBP of 1 MHz and you configure it for a voltage gain of 10, the maximum bandwidth will be 100 kHz. Distractors relating to offset voltage or maximum filter frequencies refer to completely different parameters. The GBP strictly defines the theoretical upper frequency limit where the amplifier can no longer provide any voltage gain.