Which amplifier type would you choose? Voltage feedback Op Amps and current feedback Op Amps each have their own range of recommended applications. CFB Op Amps are chosen when slew rate and exceptional low distortion are needed. VFB Op Amps excel for DC applications, and for applications requiring low input bias current or high input impedance, and where rail-to-rail performance is critical. As a general rule, CFB amplifiers will be offered for high-speed applications, whereas VFB Op Amps are ubiquitous and used for low, medium, and high-speed applications.