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CLC3600ISO14X Datasheet(PDF) 10 Page - Exar Corporation |
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CLC3600ISO14X Datasheet(HTML) 10 Page - Exar Corporation |
10 / 15 page Data Sheet ©2007-2013 Exar Corporation 10/15 Rev 1C Application Information Basic Operation Figures 3, 4, and 5 illustrate typical circuit configurations for non-inverting, inverting, and unity gain topologies for dual supply applications. They show the recommended bypass capacitor values and overall closed loop gain equations. Figure 3. Typical Non-Inverting Gain Circuit Figure 4. Typical Inverting Gain Circuit Figure 5. Typical Unity Gain (G=1) Circuit CFB amplifiers can be used in unity gain configurations. Do not use the traditional voltage follower circuit, where the output is tied directly to the inverting input. With a CFB amplifier, a feedback resistor of appropriate value must be used to prevent unstable behavior. Refer to fig- ure 5 and Table 1. Although this seems cumbersome, it does allow a degree of freedom to adjust the passband characteristics. Feedback Resistor Selection One of the key design considerations when using a CFB amplifier is the selection of the feedback resistor, Rf. Rf is used in conjunction with Rg to set the gain in the tradi- tional non-inverting and inverting circuit configurations. Refer to figures 3 and 4. As discussed in the Current Feed- back Technology section, the value of the feedback resis- tor has a pronounced effect on the frequency response of the circuit. Table 1, provides recommended Rf and associated Rg val- ues for various gain settings. These values produce the optimum frequency response, maximum bandwidth with minimum peaking. Adjust these values to optimize perfor- mance for a specific application. The typical performance characteristics section includes plots that illustrate how the bandwidth is directly affected by the value of Rf at various gain settings. Gain (V/V Rf (Ω) Rg (Ω) ±0.1dB BW (MHz) -3dB BW (MHz) 1 1240 - 129 300 2 510 510 140 230 5 200 50 18 111 Table 1: Recommended Rf vs. Gain In general, lowering the value of Rf from the recom- mended value will extend the bandwidth at the expense of additional high frequency gain peaking. This will cause increased overshoot and ringing in the pulse response characteristics. Reducing Rf too much will eventually cause oscillatory behavior. Increasing the value of Rf will lower the bandwidth. Low- ering the bandwidth creates a flatter frequency response and improves 0.1dB bandwidth performance. This is im- portant in applications such as video. Further increase in Rf will cause premature gain rolloff and adversely affect gain flatness. + - Rf 0.1μF 6.8μF Output G = - (Rf/Rg) For optimum input offset voltage set R1 = Rf || Rg Input +Vs -Vs 0.1μF 6.8μF RL Rg R1 + - Rf 0.1μF 6.8μF Output G = 1 Rf is required for CFB amplifiers Input +Vs -Vs 0.1μF 6.8μF RL + - Rf 0.1μF 6.8μF Output G = 1 + (Rf/Rg) Input +Vs -Vs Rg 0.1μF 6.8μF RL |
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