PATENT COVER GRAPHIC


United States Patent 4,042,944
August 16, 1977

Monostable Multivibrator
Tadao Yoshida

Filed April 25, 1975
Image of US PATENT 4,042,944

Abstract of the Disclosure

A monostable multivibrator having a novel four terminal semiconductor device with a generally V-shaped emitter grounded current amplification characteristic. Means are provided to bias the operation of the device to a low point on the characteristic, to provide a trigger signal to the base of the semiconductor device for placing the device in a conducting state and, through the operation of a capacitor coupled between the gate and collector terminals, to shift the operation of the device to a high level on the emitter-grounded current amplification characteristic thereby sharply decreasing the output voltage obtained at the collector. Discharge circuit means are provided for the capacitor to gradually reduce the gate voltage and to shift the operation of the device back to the low circuit point thereby reducing the collector current and suddenly increasing the collector voltage.
Figure descriptions: cover graphic

  • Figure 1 is an illustration of a four terminal device according to the present invention.
  • Figure 2 is a test circuit used for producing an emitter-grounded current amplification characteristic curve.

 Citations [54]:
  
3,204,160 08/1965 Sah 3,513,333 05/1970 Andersn 3,289,009 11/1966 Groudis 3,727,082 04/1973 Codina 3,382,375 05/1968 Dischert 3,836,797 09/1974 Steen 3,397,326 08/1968 Gallagher et al 3,407,313 10/1968 Steadson
National Museum of American History
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