Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1998-03-30
1999-12-07
Le, Dinh T.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327558, 327337, 330 9, H03K 500
Patent
active
059990422
ABSTRACT:
A switchable active filter circuit is formed which employs a ground based switch to direct a portion of a feedback current away from a virtual ground terminal of an operational amplifier, thereby providing enhanced circuit Q and greater phase control at frequencies approaching an octave from the unity gain crossover frequency of an operational amplifier used to form the filter. The circuit employs a switchable feedback tee which includes a first capacitor, a second capacitor, a third capacitor and a switch. The first capacitor and the second capacitor form a first series circuit which is connected from the output terminal to the input terminal of the operational amplifier. The third capacitor and the first switch are connected as a second series circuit which is coupled from circuit ground potential to a junction of the first capacitor and the second capacitor. When the switch is closed, a feedback current flowing in the feedback tee is divided with a portion of the current flowing through the third capacitor to circuit ground, rather than into the virtual ground terminal of the operational amplifier. This filter topology is particularly well suited for use in a multi-mode read/write channel of a tape storage system.
REFERENCES:
patent: 5293087 (1994-03-01), Hamao et al.
Brooke Jeffrey M.
Hemdal Hakan O.
Le Dinh T.
Lervick Craig J.
Plasmon LMS Inc.
LandOfFree
Switchable response active filter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Switchable response active filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Switchable response active filter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-828566