Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Reexamination Certificate
2006-08-28
2008-12-23
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
C327S552000, C327S554000
Reexamination Certificate
active
07468629
ABSTRACT:
Tuning circuits and related method for tuning transconductance in a transconductor-capacitor (Gm-C) filter system are provided. In the tuning circuit, a periodic input signal with constant amplitude triggers a transconductor cell to charge/discharge a capacitor for building an output signal across the capacitor, and a magnitude-detection feedback circuit provides feedback to tune a transconductance of the transconductor cell according to a magnitude of the output signal, such that the magnitude of the output signal can be locked within a predetermined magnitude range. When the magnitude of the output signal is locked, the ratio between transconductance and capacitance is also locked to a predetermined value because the magnitude of the output signal is determined by a ratio between transconductance and capacitance.
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Hsu Winston
Le Dinh T.
VIA Technologies Inc.
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