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CS3002 Datasheet(PDF) 9 Page - Cirrus Logic |
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CS3002 Datasheet(HTML) 9 Page - Cirrus Logic |
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9 / 16 page  CS3001 CS3002 9 The feedback capacitor C2 is required for closed- loop gains greater than 50 V/V. The capacitor in- troduces a pole and a zero in the loop gain transfer function, This indicates that the separation of the pole and the zero is governed by the closed loop gain. It is required that the zero falls on the steep slope (–100 dB/decade) of the loop gain plot so that there is some gain higher than 0 dB (typically 20 dB) at the hand-over frequency (the frequency at which the slope changes from – 100 dB/decade to –20 dB/decade). 50 p F 50 p F R1 R2 Vin Vo C2 C in C in Ch o o s e C2 so th at R 2 C 2 ≥ R1C in Figure 11. Non-Inverting Gain Configuration with Compensation T 1 s z 1 ----- + – 1 s p 1 ----- + -----------------------A ol = P 1 1 2 π R 1 R 2 || ()C 2 ------------------------------------- 1 2 π R 1C2 () ------------------------- ≅ =for R 2 R 1 » Z 1 1 2 π AR 1 × ()C 2 ----------------------------------- =where A R 2 R 1 ------ = |
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