LF147, LF347-N

SNOSBH1D – MAY 1999 – REVISED MARCH 2013

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Figure 24. Long Time Integrator with Reset, Hold and Starting Threshold Adjustment

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VOUT starts from zero and is equal to the integral of the input voltage with respect to the threshold voltage:

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Output starts when VIN≥VTH

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Switch S1 permits stopping and holding any output value

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Switch S2 resets system to zero

Figure 25. Universal State Variable Filter

For circuit shown:

fo=3 kHz, fNOTCH=9.5 kHz

Q=3.4

Passband gain:

Highpass—0.1

Bandpass—1

Lowpass—1

Notch—10

• fo×Q≤200 kHz

• 10V peak sinusoidal output swing without slew limiting to 200 kHz

• See LM148 data sheet for design equations

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