Digital to analog converter

Details Digital to analog converter Digital to analog converter

1980-10-17

1982-09-28

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

H03K 1302

Patent

active

043520928

ABSTRACT:
A digital to analog converter is provided which comprises first and second reference voltage terminals to which are supplied positive voltages, a voltage divider which comprises a plurality of resistors connected in series between the first and second reference voltage terminals, and a switch array part connected to the voltage divider for producing a voltage according to the digital signal supplied to the gate terminals. The switch array part comprises CMOS field effect transistor circuits in which the first channel MOS field effect transistors are arranged at one side of the voltage divider, the second channel MOS field effect transistors are arranged at the other side of it, and the wirings of both channel field effect transistors cross the voltage driver with electrically insulated form from the voltage divider. The p-type well region as the back gate of the NMOS field effect transistor is connected to the reference voltage terminal to which a lower positive voltage is supplied.

REFERENCES:
patent: 3984830 (1976-10-01), Buchanan
patent: 4160244 (1979-07-01), Solomon
patent: 4196420 (1980-04-01), Culmer
Hamade, "IEEE Journal of Solid-State Circuits", vol. SC-13, No. 6, Dec. 1978, pp. 785-791.

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