Depletion mode pass gates with controlling decoder and negative

Details Depletion mode pass gates with controlling decoder and negative Depletion mode pass gates with controlling decoder and negative

1996-08-01

1998-09-01

Westin, Edward P.

Electronic digital logic circuitry

Function of and, or, nand, nor, or not

Field-effect transistor

326107, 326120, 326 88, H03K 19082, H03K 1920

Patent

active

058015515

ABSTRACT:
Depletion mode pass gates utilized in a PLD to enable a gate voltage of Vcc to be applied for turn off, as opposed to a higher voltage required for enhancement type devices. With Vcc applied for turn off, gate oxide stress is reduced and chip reliability increased. A decoder utilizing PMOS transistors is further used to supply a negative gate voltage to enable turn off of the depletion mode pass gates. In one embodiment, to prevent pumping the power supply voltage above Vcc when supplying Vcc to gates of the pass gates, the decoder is an all PMOS device using PMOS transistors to connect Vcc to gates of the pass gates. In another embodiment both NMOS and PMOS transistors are utilized, with PMOS blocking transistors utilized to prevent a negative voltage from being applied to the NMOS transistors and causing current leakage. A negative voltage pump is further provided to supply a sufficient negative voltage.

REFERENCES:
patent: 4818900 (1989-04-01), Klass et al.
patent: 4835418 (1989-05-01), Hsieh
patent: 5130704 (1992-07-01), Ogawa et al.
patent: 5418480 (1995-05-01), Hastie et al.
patent: 5488316 (1996-01-01), Freeman et al.
Balasubramanian et al., "Two-Bit Partitioning Driver", IBM Technical Disclosure Bulletin, vol. 18, No. 9, pp. 2958-2959, Feb. 1976.
Cukier, "Noninverting Logic Using Depletion Load", IBM Technical Disclosure Bulletin, vol. 18, No. 10, p. 3325, Mar. 1976.
Knepper, "FET Enhancement/Depletion Logic Circuit", IBM Technical Disclosure Bulletin, vol. 20, No. 4, pp. 1422-1423, Sep. 1977.

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