Patent ID: 6084470
Filing Date: 2000-07-04
Classification: H03H

Abstract:
A filter circuit comprising:a first transistor having a first electrode, second electrode, and control electrode;a second transistor having a first electrode, second electrode, and control electrode, the first electrode of said second transistor being connected to the second electrode of said first transistor;a third transistor having a first electrode, second electrode, and control electrode, the second electrode of said third transistor being connected to the control electrode of said second transistor;a fourth transistor having a first electrode, second electrode, and control electrode, the first electrode of said fourth transistor being connected to the second electrode of said third transistor and the control electrode of said fourth transistor being connected to the first electrode of said second transistor;a first capacitor substantially connected between the second electrodes of said second and fourth transistors;a second capacitor substantially connected between the first electrodes of said second and fourth transistors;a first constant current source connected to the second electrode of said second transistor; anda second constant current source connected to the second electrode of said fourth transistor, andwherein the second electrodes of said second and fourth transistors are current input terminals, the first electrodes of said first and third transistors are current output terminals, and the control electrodes of said second and fourth transistors are voltage output terminals.