MF5 datasheet(9/18 Pages) TI1

9 / 18 page

20 Modes of Operation (Continued)

MODE 2 Notch 2 Bandpass Lowpass fnotchkfo

(See

Figure 9 )

center frequency

fCLK

100

0R2R4a1orfCLK500R2R4a1

fnotch

fCLK

100

fCLK

quality factor of the complex pole pair

e 0

R2R4 a 1

R2R3

HOLP e Lowpass output gain (as f

x 0)

R2R1

R2R4 a 1

HOBP e Bandpass output gain (at f e fo) ebR3R1

HON1 e Notch output gain (as f x 0)

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 )

fCLK

100

0R2R4orfCLK50c0R2R4

quality factor of the complex pole pair

0R2R4cR3R2

HOHP e Highpass gain

asfxfCLK2J ebR2R1

HOBP e Bandpass gain (at f e fo) eb

HOLP e Lowpass gain (as f

x 0) eb

Circuit dynamics

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

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