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ADA4310-1ARHZ-R7 Datasheet(PDF) 10 Page - Analog Devices |
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ADA4310-1ARHZ-R7 Datasheet(HTML) 10 Page - Analog Devices |
10 / 16 page ADA4310-1 Rev. 0 | Page 10 of 16 THEORY OF OPERATION The ADA4310-1 is a current feedback amplifier with high output current capability. With a current feedback amplifier, the current into the inverting input is the feedback signal, and the open-loop behavior is that of a transimpedance, dVO/dIIN or TZ. The open-loop transimpedance is analogous to the open-loop voltage gain of a voltage feedback amplifier. Figure 20 shows a simplified model of a current feedback amplifier. Because RIN is proportional to 1/gm, the equivalent voltage gain is just TZ × gm, where gm is the transconductance of the input stage. Basic analysis of the follower with gain circuit yields () () F IN Z Z IN O R R G s T s T G V V + × + × = where: G F R R G + = 1 Ω 50 1 ≈ = m IN g R Because G × RIN << RF for low gains, a current feedback amplifier has relatively constant bandwidth vs. gain, the 3 dB point being set when |TZ| = RF. Of course, for a real amplifier there are additional poles that contribute excess phase, and there is a value for RF below which the amplifier is unstable. Tolerance for peaking and desired flatness determines the optimum RF in each application. RF VOUT RG RN VIN RIN IIN TZ Figure 20. Simplified Block Diagram |
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