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MF5CWM Datasheet(PDF) 9 Page - Texas Instruments |
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MF5CWM Datasheet(HTML) 9 Page - Texas Instruments |
9 / 18 page 20 Modes of Operation (Continued) MODE 2 Notch 2 Bandpass Lowpass fnotchkfo (See Figure 9 ) fo e center frequency e fCLK 100 0R2R4a1orfCLK500R2R4a1 fnotch e fCLK 100 or fCLK 50 Q e quality factor of the complex pole pair e 0 R2R4 a 1 R2R3 HOLP e Lowpass output gain (as f x 0) eb R2R1 R2R4 a 1 HOBP e Bandpass output gain (at f e fo) ebR3R1 HON1 e Notch output gain (as f x 0) eb R2R1 R2R4 a 1 HON2 e Notch output gain asfxfCLK2J ebR2R1 Filter dynamics HOBP e Q 0HOLP HON2 e Q 0HON1 HON2 MODE 3 Highpass Bandpass Lowpass Outputs (See Figure 10 ) fo e fCLK 100 c 0R2R4orfCLK50c0R2R4 Q e quality factor of the complex pole pair e 0R2R4cR3R2 HOHP e Highpass gain asfxfCLK2J ebR2R1 HOBP e Bandpass gain (at f e fo) eb R3 R1 HOLP e Lowpass gain (as f x 0) eb R4 R1 Circuit dynamics R2 R4 e HOHP HOLP HOBP e 0HOHP c HOLP c Q HOLP(peak) j Q c HOLP (for high Q’s) HOHP(peak) j Q c HOHP (for high Q’s) TLH5066 – 18 FIGURE 9 MODE 2 TLH5066 – 19 FIGURE 10 MODE 3 In Mode 3 the feedback loop is closed around the input summing amplifier the finite GBW prod- uct of this op amp causes a slight Q enhance- ment If this is a problem connect a small capaci- tor (10 pF–100 pF) across R4 to provide some phase lead 8 |
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