What is the basic difference between a current feedback amplifier (CFA) and a voltage feedback amplifier (VFA)?
Simply put, the positive node voltage Vp in the VFA tracks the negative node voltage Vn by performing negative feedback. In CFA, tracking is achieved through design.
The history of CFA is not as long as VFA, and there is no high popularity of VFA. But when used in the right application, CFA does have a huge advantage.
Some of the key advantages of CFA are its high bandwidth, high slew rate and low distortion, making it ideal for large transient interfaces such as audio applications. Welcome to the LME49723 for low noise and low distortion. On the other hand, CFAs generally do not have the high precision of VFAs and may have a large number of input bias currents that can result in higher current noise densities. In addition, the CFA also has an input impedance mismatch problem (negative node input impedance is low) because a buffer can be used internally between the inverting and non-inverting inputs.
In order to avoid the problem of insufficient CFA accuracy, it can be combined with VFA to form a composite amplifier. Professor Sergio Franco explores many of these topologies in his eight chapter, "Designing with Op Amps and Integrated Circuits."
For applications that require fast current-to-voltage conversion, CFA is ideal because the transimpedance of the lightguide mode requires driving the cable in the optical system, which requires high output current, even for active filter designs. in this way. The OPA695 is a 12V CFA with a noise floor below 3nV/rtHz and an output current of 90mA.
A common fault associated with CFA is its use as an integrator. Inserting a capacitor in the feedback loop can cause severe instability. I recommend connecting a resistor in series with the inverting input before the feedback capacitor. Resistor resistance must be carefully chosen to avoid reducing bandwidth when it is not necessary.
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