Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1994-06-06
1995-12-26
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327379, 327198, 326 21, H03K 500
Patent
active
054791324
ABSTRACT:
A filter circuit includes an input node for receiving an unfiltered input signal, an output node for providing a filtered output signal, and an intermediate node. An integrator has an input coupled to the input node and an output coupled to the intermediate node. A Schmitt trigger has an input coupled to the intermediate node and an output coupled to the output node. A reset circuit has a first input coupled to the input node, a second input coupled to the output node, and an output coupled to the intermediate node. The signal on the intermediate node is generated by integrating the unfiltered logic input signal if the input signal and the output signal are at opposite logic states. A filtered output logic signal is generated by conditioning the intermediate signal with the Schmitt trigger. The reset circuit resets the intermediate signal if the input signal and the output signal are each at a zero logic state or if the input signal and the output signal are each at a one logic state.
REFERENCES:
patent: 4045688 (1977-08-01), Stewart
patent: 5324999 (1994-06-01), Hunley et al.
Smith Gregory M.
Verhaeghe Donald J.
Callahan Timothy P.
Le Dinh
Meza Peter J.
Ramtron International Corporation
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