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CS3002 Folha de dados(PDF) 9 Page - Cirrus Logic |
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CS3002 Folha de dados(HTML) 9 Page - Cirrus Logic |
9 / 16 page CS3001 CS3002 DS490F9 9 3.2 Open-loop Gain and Stability Compensation 3.2.1 Discussion The CS3001 and CS3002 achieve ultra-high open loop gain. Figure 16 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 and R1 ≤ 100 Ohms. For a gain of 50, the phase margin is between 40 ° and 60° depending upon the loading conditions. As shown in Figure 17, on page 10, the operational amplifier has an input capacitance at the + and – signal inputs of typically 50 pF. This capacitance adds an additional pole in the loop gain transfer function at a frequency of f = 1/(2 πR*Cin) where R is the parallel combination of R1 and R2 (R1 || R2). A higher value 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*C in. R1 R2 Vin Vo R S Figure 16. Non-inverting Gain Configuration |
Nº de peça semelhante - CS3002 |
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Descrição semelhante - CS3002 |
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