Transistor inverse mode impulse generator
AssigneeInternational Business Machines Corporation
InventorGeorge E. Smith, III
Life of this patent
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Abstract
An impulse generator for detecting an edge of an input pulse. The impulse generator comprises a first and second transistors connected to turn on at the occurrence of a signal pulse on an input line, with the second transistor connected to operate in its inverse mode so that it has a longer turn-on time. The second transistor is connected in such a manner as to draw current away from the base of the first transistor when the second transistor turns on, thereby causing an impulse to be generated at the output terminal of the first transistor, regardless of the width of the input pulse.
Claims21
an impulse generator for generating an impulse at an edge of an input pulse, comprising:
- an input line for receiving an input pulse;
- a gate circuit including a gate transistor with an output terminal, and with a control input terminal for turning said gate transistor on and off, said control input terminal being connected to said input line to turn on said gate transistor at the occurrence of one edge of a pulse on said input line;
- and
- a second transistor connected to operate in its inverse mode so that it has a longer turn-on time than said gate transistor, said second transistor having a control input terminal connected to said input line to turn on said second transistor at the occurrence of said one edge of said pulse on said input line, said second transistor being connected to turn said gate transistor off when said second transistor turns on, to thereby cause an impulse to be generated at the output terminal of said gate transistor, regardless of the width of said input pulse.
An impulse generator for generating an impulse at the edge of an input signal, comprising:
- an input line;
- a first current-controlled transistor including an output terminal, and a control input terminal connected to said input line to turn-on said first current-controlled transistor at the occurrence of a signal pulse on said input line;
- and
- a second current-controlled transistor connected to operate in its inverse mode so that it has a longer turn-on time than said first current-controlled transistor, said second current-controlled transistor having a control input terminal connected to said input line to turn on said second current-controlled transistor at the occurrence of a pulse on said input line, said second current-controlled transistor being connected to the control input terminal of said first current-controlled transistor to thereby turn off said first current-controlled transistor when said second current-controlled transistor turns on, to thereby cause an impulse to be generated at the output terminal of said first current-controlled transistor, regardless of the width of said input pulse.
An impulse generator for generating an impulse at the edge of an input pulse, comprising:
- first means connected to an output terminal and an input terminal and including a gate transistor with a first turn-on time, said first means for changing the output level on said output terminal to a first level upon the occurrence of one edge of a pulse on said input line;
- and
- second means connected to said first means including a second transistor with a longer turn-on time than said first turn-on time, said second means for changing said first level on said output terminal to a second level which is different from said first level automatically after a time delay from the occurrence of the first level, said time delay being approximately equivalent to the difference between said second transistor turn-on time and said gate transistor turn-on time.
Dependencies are inferred from the claim text.