In the range of the sample electroactivity, the gain-bandwidth product
is constant, that is high-contrast devices are associated with slow response time and vice versa.
Designers have concentrated the efforts mainly on increasing the gain-bandwidth product
and the gain flatness, as well as on output power capabilities.
The OPA454 is unity-gain stable and can track fast moving signals since it has a slew rate of 10 V/[mu]s and gain-bandwidth product
of 2.5 MHz.
A direct consequence of these characteristics is that InP-based HBTs can achieve a very high amplifier gain-bandwidth product
per DC power ratio (GBP/[P.sub.dc]) for low supply voltage operation under 3 V.