High to low transition speed up circuit for TTL-type gates

Details High to low transition speed up circuit for TTL-type gates High to low transition speed up circuit for TTL-type gates

1985-01-31

1987-11-03

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307473, 307443, 307458, 307300, H03K 1901, H03K 19088, H03K 1704, H03K 1760

Patent

active

047045485

ABSTRACT:
The specification discloses an input transistor (14) which is variable between high and low impedance states in response to input voltage transitions at terminal 10. An output transistor (16) is coupled to the input transistor (14) and is responsive to an input transition at terminal 10 for changing impedance states. Circuitry including a speed up transistor (44) is coupled between the input transistor (14) and output transistor (16) for applying added current to the output transistor (16) to speed the change of impedance state. The circuitry applies added current to output transistor (16) until the output voltage at terminal (18) falls below twice the base-emitter voltage of the output transistor (16).

REFERENCES:
patent: 3461314 (1969-08-01), Standeven et al.
patent: 3510685 (1970-05-01), Watanabe et al.
patent: 3524992 (1970-08-01), Kardash
patent: 4081695 (1978-03-01), Allen et al.
patent: 4255670 (1981-03-01), Griffith
patent: 4430585 (1984-02-01), Kirk, Jr.
patent: 4486674 (1984-12-01), Neely
patent: 4521699 (1985-06-01), Wilson
patent: 4591741 (1986-05-01), Cooper

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