Pulse generator producing pulses having a width free from a powe

Details Pulse generator producing pulses having a width free from a powe Pulse generator producing pulses having a width free from a powe

1986-12-23

1988-11-15

Zazworsky, John

Oscillators

Solid state active element oscillator

Transistors

307265, 307268, 307491, 331 52, H03K 302, H03K 504

Patent

active

047852623

ABSTRACT:
A pulse generator includes a capacitor having one end held at a reference potential and the other end, a first inverter having a threshold voltage and its input portion connected to the other end of the capacitor, a control circuit producing a signal for discharging the capacitor for a limited time period in response to an output from the first inverter, a switch for discharging the capacitor in response to the discharging signal, a resistor having a resistance, a current controller controlling the current flowing through the resistor to have a value obtained by dividing the threshold voltage by the resistance, and a means for supplying the current to the capacitor, output pulses being derived from input and/or output portion and/or internal portion of the control circuit. The control circuit may be a monostable multivibrator, a delay circuit or the like. The current controller may be formed of a transistor connected in series with the resistor and a second inverter having its input connected to the connecting point of the transistor and the resistor and its output connected the control electrode of the transistor, the second inverter having the same threshold voltage as the first inverter. The current supplying means may be a current-mirror.

REFERENCES:
patent: 3883825 (1975-05-01), Cohen
patent: 4122413 (1978-10-01), Chen
patent: 4255722 (1981-03-01), Hochstrate
patent: 4370628 (1983-01-01), Henderson et al.

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