Line driver having maximum output voltage capacity

Details Line driver having maximum output voltage capacity Line driver having maximum output voltage capacity

1994-11-01

1996-05-21

Westin, Edward P.

Electronic digital logic circuitry

Interface

Current driving

326 86, 326 98, 326 15, H03K 190185, H03K 190948, H03K 19003

Patent

active

055193404

ABSTRACT:
A line driver (10) includes a first p-channel FET (12) and two n-channel FETs (14-16), wherein one of the n-channel FETs functions as a blocking FET (16). The p-channel FET (12) is coupled to the supply voltage (26) and the blocking FET (16), while the other n-channel FET (14) is coupled to a supply return (28) and the blocking FET (16). An output (30) is provided between the n-channel FET (14) and the blocking FET (16), while inputs (20-22) are provided to the p-channel FET (12) and the n-channel FET (16). In operation, the inputs (20-22) are supplied to the FETs at a given rate such that either the p-channel or the n-channel FET is "on". To ensure a maximum output swing when the p-channel FET is on, the blocking FET (16) is sourced by a charge pump (18).

REFERENCES:
patent: 4316106 (1982-02-01), Young et al.
patent: 4649300 (1987-03-01), Schutz
patent: 4806798 (1989-02-01), Kanauchi
patent: 5128563 (1992-07-01), Hush et al.
patent: 5138200 (1992-08-01), Barsanti et al.
patent: 5399920 (1995-03-01), Van Tran

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