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Extra info for Practical Analog Design Techniques (Analog Devices Technical Reference Books)

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For highest linearity, it does not use internal capacitive load compensation. This factor, plus a high current (50mA) output stage provides the gain linearity required for high performance video, and line driving applications. 05° for a 2Vp-p VOUT video swing while operating at ±15V. These figures do degrade for operation at Vs= ±5V, but can be maintained for supplies of ±10V or more. Thus to minimize distortion, supplies of ±10V to ±15V should be used. Other video grade op amps can also be used for U1, but illustrate the potential for distortion tradeoffs.

1, where the capacitively loaded amplifier with a noise gain of unity at the left is seen to be unstable, due to a 1/ß open loop rolloff intersection on the Bode diagram in an unstable –12dB/octave region. For such a case, quite often stability can be restored by introducing a higher noise gain to the stage, so that the intersection then occurs in a stable –6dB/octave region, as depicted at the diagram right Bode plot. 2. This trick is more broad in scope than overcompensation, and has the advantage of not requiring access to any internal amplifier nodes.

Assuming that CL is a value which produces a parasitic pole near the amplifier’s natural crossover, this loading combination would likely lead to oscillation due to the 4 excessive phase lag. However with RD connected, the higher amplifier noise gain produces a new 1/ß - open loop rolloff intersection, about a decade lower in frequency. This is set low enough that the extra phase lag from CL is no longer a problem, and amplifier stability is restored. A drawback to this trick is that the DC offset and input noise of the amplifier are raised by the value of the noise gain, when the optional CD is not present.

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