Edge detector

Details Edge detector Edge detector

1995-06-07

1998-05-05

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327205, H03K 5153

Patent

active

057480141

ABSTRACT:
An edge detector for producing output signals in a manner dependent on positive and/or negative edges of an input signal comprises a control circuit (10), by which a reference signal level (V.sub.ref) available at a storage element (C) may be continuously assimilated at a predeterminable first level change rate (PG.sub.1) to the input voltage level (V.sub.E). It moreover includes at least one comparison circuit (12), which supplies an output signal (V.sub.A, V.sub.A ') indicative of the occurrence of an edge, when the input voltage level (V.sub.E) changes by at least a predeterminable relative threshold value (U.sub.off) in relation to the reference voltage level (V.sub.ref). The control circuit (10) comprises a delay means (14) whose delay time (.DELTA.t.sub.D) causing a delay in the assimilation of the reference voltage level is selected to be equal to the ratio of the predeterminable relative threshold value (U.sub.off) to the predeterminable first level change rate (PG.sub.1).

REFERENCES:
patent: 3838448 (1974-09-01), Garde et al.
patent: 4571547 (1986-02-01), Day
patent: 4585952 (1986-04-01), Yamamoto
patent: 5404054 (1995-04-01), Kotowski

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