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AD8005AR Datenblatt(PDF) 11 Page - Analog Devices |
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AD8005AR Datenblatt(HTML) 11 Page - Analog Devices |
11 / 12 page AD8005 –11– REV. A Increasing Feedback Resistors Unlike conventional voltage feedback op amps, the choice of feed- back resistor has a direct impact on the closed-loop bandwidth and stability of a current feedback op amp circuit. Reducing the resistance below the recommended value makes the amplifier more unstable. Increasing the size of the feedback resistor reduces the closed-loop bandwidth. VOUT +5V 562 4.99k 2V (rms) –5V AD8005 VIN 0.2V (rms) QUIESCENT CURRENT 475 A (MAX) 360 A (rms) Figure 33. Saving Power by Increasing Feedback Resistor Network In power-critical applications where some bandwidth can be sacrificed, increasing the size of the feedback resistor will yield significant power savings. A good example of this is the gain of +10 case. Operating from a bipolar supply ( ±5 V), the quiescent current is 475 µA (excluding the feedback network). The recom- mended feedback and gain resistors are 499 Ω and 56.2 Ω respectively. In order to drive an rms output voltage of 2 V, the output must deliver a current of 3.6 mA to the feedback net- work. Increasing the size of the resistor network by a factor of 10 as shown in Figure 33 will reduce this current to 360 µA. The closed loop bandwidth will however decrease to 20 MHz. |
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