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CS3011-IS датащи(PDF) 10 Page - Cirrus Logic |
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CS3011-IS датащи(HTML) 10 Page - Cirrus Logic |
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10 / 18 page ![]() CS3011 CS3012 10 DS597F5 3.2 Open Loop Gain and Stability Compensation 3.2.1 Discussion The CS3011 and CS3012 achieve ultra-high open loop gain. Figure 15 illustrates the amplifier in a non-inverting gain configuration. The open loop gain and phase plots indicate that the amplifier is stable for closed-loop gains less than 50 V/V. For a gain of 50, the phase margin is between 40 ° and 60 ° depending upon the loading conditions. As shown in Figure 16 on page 11, the op amp has an input capacitance at the + and – signal inputs of typically 50 pF. This capacitance adds an addition- al pole in the loop gain transfer function at a fre- quency of f = 1/(2 πR*Cin) where R is the parallel combination of R1 and R2 (R1 || R2). A higher val- ue for R produces a pole at a lower frequency, thus reducing the phase margin. R1 is recommended to be less than or equal to 100 ohms, which results in a pole at 30 MHz or higher. If a higher value of R1 is desired, a compensation capacitor (C2) should be added in parallel with R2. C2 should be chosen such that R2*C2 ≥ R1*Cin. R1 R2 Vin Vo R S Figure 15. Non-Inverting Gain Configuration |
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