= Gain-bandwidth product
{title2=$f_t$}
For a dominant-pole voltage-feedback <operational amplifier> with $A(s)=A_0/(1+s/\omega_a)$ and $A_0\gg1$, the unity-gain <angular frequency> is approximately $\omega_t=A_0\omega_a$. In the range where this pole dominates, a roughly constant closed-loop noise gain $G_N$ gives a bandwidth approximately $f_t/G_N$. This approximation depends on the amplifier model and <feedback control> circuit; it is not a universal statement about all amplifiers or all frequency-dependent feedback networks. https://wiki.analog.com/university/courses/alm1k/alm-lab-gbw[Analog Devices, Activity: Op-Amp Gain Bandwidth Product, dominant-pole gain and unity-gain frequency]{ref}
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