Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Generating trapezoidal output
Patent
1997-07-15
1999-02-16
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Generating trapezoidal output
327170, 327478, H03K 496
Patent
active
058724745
ABSTRACT:
An object of the present invention is to provide a waveform shaping circuit for producing a trapezoidal pulse whose leading edge and trailing edge have the same slope and not inducing and radiating harmonic components under any conditions. A waveform shaping circuit comprises a common-emitter transistor 1, a first resistor 2 and second resistor 3 connected in series between a signal input terminal 9 and the base of the transistor 1, a third resistor and first capacitor 5 connected in parallel between a node a between the first resistor 2 and second resistor 2 and a ground, a feedback capacitor 6 connected between the collector of the transistor 1 and the node 1, and a collector load resistor 7 connected in series with the collector of the transistor 1. The waveform of a pulse to be applied to the signal input terminal 9 is reshaped to produce a trapezoidal pulse whose leading edge and trailing edge have a substantially equal slope, and then the trapezoidal pulse is led through a signal output terminal 10. When the waveform shaping circuit is employed in a transmission unit in a communication block in a door control unit included in an on-vehicle multiplex communication network system, the magnitude of induction and radiation of unwanted harmonic components can be reduced drastically.
REFERENCES:
patent: 3275851 (1966-09-01), Bedingfield
patent: 3573502 (1971-04-01), Kan
patent: 3597638 (1971-08-01), Jensen
patent: 4504779 (1985-03-01), Haman
Kagomiya Shigetoshi
Kawata Toshihiko
Alps Electric Co. ,Ltd.
Callahan Timothy P.
Kim Jung Ho
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