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AD8392A 데이터시트(PDF) 7 Page - Analog Devices |
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AD8392A 데이터시트(HTML) 7 Page - Analog Devices |
7 / 12 page AD8392A Rev. 0 | Page 7 of 12 THEORY OF OPERATION The AD8392A is a current feedback amplifier with high (500 mA) 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 16 shows a simplified model of a current feedback amplifier. Because RIN is proportional to 1/gm, the equivalent voltage gain is 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 16. Simplified Block Diagram The AD8392A is capable of delivering 500 mA of output current while swinging to within 2 V of either power supply rail. The AD8392A also has a power management system included on-chip. It features four user-programmable power levels (three active power modes as well as the provision for complete shutdown). |
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