Waveform shaping circuit
First Claim
1. A waveform shaping circuit, comprising:
- a transistor having at least a first main electrode, second main electrode, and control electrode, and having said first main electrode grounded;
first and second resistors connected in series between a signal input terminal and said control electrode;
a third resistor and first capacitor connected in parallel between a node between said first and second resistors and a ground;
a second capacitor connected between said second main electrode and said node; and
a load resistor connected between said second main electrode and power supply terminal,wherein the waveform of a pulse to be applied to said signal input terminal 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 said second main electrode.
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Accused Products
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.
16 Citations
5 Claims
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1. A waveform shaping circuit, comprising:
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a transistor having at least a first main electrode, second main electrode, and control electrode, and having said first main electrode grounded; first and second resistors connected in series between a signal input terminal and said control electrode; a third resistor and first capacitor connected in parallel between a node between said first and second resistors and a ground; a second capacitor connected between said second main electrode and said node; and a load resistor connected between said second main electrode and power supply terminal, wherein the waveform of a pulse to be applied to said signal input terminal 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 said second main electrode. - View Dependent Claims (2, 3, 4, 5)
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Specification