Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1993-06-28
1994-11-22
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
330257, 327 52, 327205, H03K 522
Patent
active
053672119
ABSTRACT:
A current source is selectively switched into the output circuit of a differential amplifier for producing hysteresis. In a circuit embodying the invention, a differential amplifier (diff-amp) stage operated at a first current level set by a first current source has first and second input terminals for the application therebetween of a differential input signal and first and second output nodes for the production of differential output signals. A second current source for inducing hysteresis is connected to one of the output nodes of the diff-amp and is selectively enabled. A differential input signal (VIN) is applied across the input terminals. When VIN varies in one direction and reaches a first threshold level, the second, hysteresis inducing, current source is enabled whereby a larger current can flow in the one node. VIN then has to vary in the opposite direction and reach a second threshold level to disable the second current source. When the first threshold level is reached the output of the amplifier stage switches from a first state to a second state and when the second threshold level is reached the output of the amplifier switches from the second state to the first state.
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Giordano Raymond L.
Isham Robert H.
Leidich Arthur J.
Callahan Timothy P.
Harris Corporation
Krawczyk C. C.
Lam T. T.
Schanzer Henry I.
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