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LMH6704MANOPB Datasheet(PDF) 9 Page - National Semiconductor (TI) |
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LMH6704MANOPB Datasheet(HTML) 9 Page - National Semiconductor (TI) |
9 / 20 page 1 10 100 1000 FREQUENCY (MHz) -6 -5 -4 -3 -2 -1 0 1 2 3 4 STANDARD CIRCUIT (FIGURE 2) ALTERNATE CIRCUIT (FIGURE 4) 2 3 4 6 1 VOUT + - VIN +5V -5V CPOS 6.8 µF .01 µF 6.8 µF CNEG .01 µF RIN 0.1 µF CSS LMH6704 LMH6704 www.ti.com SNOSAD0C – FEBRUARY 2005 – REVISED MARCH 2013 Figure 20. Alternate Unity Gain Configuration UNITY GAIN COMPENSATION With a current feedback Selectable Gain Buffer like the LMH6704, the feedback resistor is a compromise between the value needed for stability at unity gain and the optimized value needed at a gain of two. In standard open-loop current feedback operational amplifiers the feedback resistor, RF, is external and its value can be adjusted to match the required gain. Since the feedback resistor is integrated in the LMH6704, it is not possible to adjust it’s value. However, we can employ the circuit shown in Figure 20. This circuit modifies the noise gain of the amplifier to eliminate the peaking associated with using the circuit shown in Figure 18. The frequency response is shown in Figure 21. The decreased peaking does come at a price as the output referred voltage noise density increases by a factor of 1.1. Figure 21. Unity Gain Frequency Response OUTPUT VOLTAGE NOISE Open-loop operational amplifiers specify three input referred noise parameters: input voltage noise, non-inverting input current noise, and inverting input current noise. These specifications are used to calculate the total voltage noise produced at the output of the amplifier. The LMH6704 is a closed loop amplifier with internal resistors, thus only the non-inverting input current noise flows through external components. All other noise sources are internal to the part. There are four possible values for the noise at the output depending on the gain configuration as shown in Table 2. For more information on calculating noise in current feedback amplifiers see Application Notes OA-12 and AN104 available at www.ti.com. The total noise voltage at the output can be calculated using Equation 1: Copyright © 2005–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LMH6704 |
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