D/A converter

Details D/A converter D/A converter

1997-08-28

1999-02-09

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

With particular solid state devices

341154, H03M 178

Patent

active

058700455

ABSTRACT:
The present invention provides a D/A converter which has a small area in the chip, a linear current output and a high-speed operation. Each of resistors R.sub.11 -R.sub.n1 in a resistor train 11a is composed of four MOS transistors which are connected in parallel with each other and each of resistors R.sub.12 -R.sub.n2 in a resistor train 11b is composed of four MOS transistors which are connected in parallel with each other. Between the connecting nodes of the resistor trains 11a, 11b, MOS transistors ST.sub.11, ST.sub.12, ST.sub.13, ST.sub.14 -ST.sub.n1, ST.sub.n2, ST.sub.n3 and ST.sub.n4 which serve as switches and resistors are connected. All the MOS transistors have the same conductive type and size. Gate control signals C.sub.11 -C.sub.n1 ; C.sub.12 -C.sub.n2 turn MOS transistors ON but each of them has a different voltage value. A current difference between the output terminals Za and Zb is converted into a voltage difference by an operational amplifier or the like.

REFERENCES:
patent: 4415883 (1983-11-01), Von Sichart
patent: 4635038 (1987-01-01), Wincn
patent: 4683458 (1987-07-01), Hallgren
patent: 5455582 (1995-10-01), Valdenaire
patent: 5525986 (1996-06-01), Kovacs et al.

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