Low leakage CMOS D/A converter

Details Low leakage CMOS D/A converter Low leakage CMOS D/A converter

1985-08-06

1986-05-20

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

340347CC, 307585, H03K 17687

Patent

active

045904561

ABSTRACT:
A CMOS DAC with means to avoid leakage current. In one embodiment, the back gates of the CMOS switches are held at -200 mV with respect to the output lines, and the logic low level to the off switch also is set at -200 mV relative to the output lines. In another embodiment, the CMOS switches are ion-implanted. In a still further embodiment, the output lines are held at a potential 200 mV more positive than the P- well of the CMOS switches.

REFERENCES:
patent: 3984830 (1976-10-01), Buchanan et al.
patent: 4446390 (1984-05-01), Alaspa
Cecil "1974 IEEE International Solid-State Circuits Conference Digest of Technical Papers", pp. 196-197, Feb. 1974.
Milnes, "Semiconductor Devices and Electronics", Van Nostrand Reinhold Co., 1980, pp. 398-399.

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