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:
•
•
•
Output starts when VIN≥VTH
Switch S1 permits stopping and holding any output value
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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