Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1998-07-23
2000-01-04
Le, Dinh T.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327337, 327308, 333172, H03K 500
Patent
active
060114320
ABSTRACT:
Circuits having switched capacitors that are implemented with T-structures in which one of the three capacitors in the T-structure is implemented with a buffer amplifier configured to receive a control signal (e.g., a control voltage) and to apply a buffered control signal to an active device having a capacitance that is dependent on the control signal level. In one embodiment, the control signal is a control voltage, the active device is a varactor diode, and the circuit is a ladder filter having one or more switched capacitors, each of which is implemented using the T-structure of the present invention. Under the present invention, continuously tunable circuits can be implemented with discrete elements where the circuits can be tuned by changing the control signal in one or more of the switched capacitors, without having to provide a continuously tunable clock.
REFERENCES:
patent: 4731585 (1988-03-01), Fox
patent: 5719573 (1998-02-01), Leung et al.
Fratti Roger A.
Lopata Douglas D.
Le Dinh T.
Lucent Technologies - Inc.
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