Voltage Feedback Amplifier(VFB) or Current Feedback Amplifier(CFB). that is the question!

This document will summarize the difference

Current Feedback Amplifier

Advantage

• No fixed gain bandwidth product (high gain and high bandwidth at the same time!)
• Ultra slew rate (Inverting configuration maximizes input slew rate)

Disadvantage

• Only the non-inverting input is the high input impedance
• feedback resistor plays a large role in amplifier stability this can also limit the value of the gain set resistor.
• The signal bandwidth is determined by RF(feedback resistor) and not by the circuit gain
• Limited DC gain
• A larger headroom is needed for the output

Notes

• CFA circuits must never include a direct capacitance between the output and inverting input pins as this often leads to oscillation

Voltage Feedback Amplifier

Advantage

• Easier to design, no sensitivity to the values of feedback resisters
• High DC gain