Switched-capacitor IC controls feedback loop:
02/17/00 EDN-Design Ideas / You can implement
a simple control loop with a constant setpoint over
a wide range of control by using a
switched-capacitor filter. The circuit controls
motor speed over 1 to 200 Hz or 60 to 12,000 rpm. In
Figure 1 , a National LMF40CIWM four-pole lowpass...
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