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EL5455IS Datasheet(PDF) 11 Page - Intersil Corporation |
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EL5455IS Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 16 page 11 FN7385.4 October 3, 2005 Application Circuits Sullen Key Low Pass Filter A common and easy to implement filter taking advantage of the wide bandwidth, low offset and low power demands of the EL5152. A derivation of the transfer function is provided for convenience. (See Figure 28.) Sullen Key High Pass Filter Again this useful filter benefits from the characteristics of the EL5152. The transfer function is very similar to the low pass so only the results are presented. (See Figure 29.) FIGURE 28. SULLEN KEY LOW PASS FILTER K 3 1 Q RC 1 wo K Holp C R C R C R C R C R C R ) K 1 ( 1 Q C R C R 1 wo K Holp ) C R C R C R ) K 1 (( jw C R C R w 1 1 ) jw ( H 1 s ) C R C R C R ) K 1 (( s C R C R K ) s ( H 0 s C 1 Vi Vo R V K Vo 1 R Vi V V 1 s C R 1 K Vo R R 1 K 1 1 2 2 1 2 2 1 2 2 1 1 2 2 1 1 2 2 2 1 1 1 2 2 1 1 2 2 21 2 1 1 1 2 2 2 1 1 1 2 1 1 1 1 2 2 A B − = = = + + − = = = + + − + − = + + + − + = = − + − + − + = + = Equations simplify if we let all components be equal R=C + - 1n 5V V2 C1 R1 R2 V1 1K C2 RA 1K 1K RB 5V V3 R7 1K VOUT 1 3 2 V+ V- 4 U1A 1n 1n 1K 11 L1 10µH C6 1n C3 R5 1K 1n C5 L3 10µH 1n C4 R6 1K EL5152, EL5153, EL5252, EL5455 |
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