Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By pulse coincidence
Patent
1995-06-07
1998-02-10
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By pulse coincidence
327 79, 327481, H03K 522
Patent
active
057173486
ABSTRACT:
A edge detector for the production of output signal in a manner dependent on positive and negative edges of a square wave signal comprises a differential amplifier with two base-coupled transistors (Q1, Q2). Each emitter of such transistors is connected via a constant current source (S1 and, respectively, S2) with a supply voltage line (10) and the emitter currents of the transistors are split up between two collectors, of which the first ones are connected with one another and, via a third constant current source (S3), with ground (12). Two output loops each comprise a series circuit composed of a resistor (R3, R4) and the collector-emitter path of an output transistor (Q3, Q4) between ground (12) and the supply voltage line (10). In the case of each of such output transistors (Q3, Q4) the base is connected in each case with a second collector of the base-coupled transistor (Q1, Q2) so that the switching state of the output transistors (Q1, Q2) is set by the voltage at each second collector. The output signals are able to be tapped at the collector of such output transistors (Q3, Q4). An input terminal (14) is connected with the emitter of one (Q1) of the base-coupled transistors (Q1, Q2) for the supply of a current dependent on the input signal and one capacitor (C1) is connected with the emitter of the other one (Q2) of the base-coupled transistors (Q1, Q2).
REFERENCES:
patent: 3588541 (1971-06-01), Chan et al.
patent: 4429234 (1984-01-01), Streit
patent: 5262682 (1993-11-01), Mitsuya et al.
Patent Abstracts of Japan, vol. 12, No. 9 (E-572) (2856), Jan. 12, 1988. (Japanese Laid Open Patent Appln. Pub. 62-169,514 published Jul. 25, 1987) .
Callahan Timothy P.
Donaldson Richard L.
Guttman David S.
Texas Instruments Deutschland GmbH
Wells Kenneth B.
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