Coded data generation or conversion – Analog to or from digital conversion – With particular solid state devices
Patent
1988-06-27
1991-04-16
Pellinen, A. D.
Coded data generation or conversion
Analog to or from digital conversion
With particular solid state devices
341136, 341154, 307570, H03M 178
Patent
active
050086715
ABSTRACT:
A digital-to-analog converter comprising a set of identical DAC cells each including: (1) a PNP bipolar current source transistor producing a continuous output current (equal values for all DAC cells), (2) a pair of PMOS switches connected to the collector of the bipolar transistor to divert the output current to either a ground line or a corresponding node of an R/2R ladder, (3) ladder circuitry for maintaining the full-scale ladder voltage below a predetermined level which keeps the PMOS switches in the saturated region of their characteristics, and (4) make-before-break switch control circuitry to close the PMOS switch being activated prior to opening the other PMOS switch.
REFERENCES:
patent: 4141004 (1979-02-01), Craven
patent: 4381499 (1983-04-01), Struthoff
patent: 4405916 (1983-09-01), Hornak et al.
patent: 4558242 (1985-12-01), Tuthill et al.
patent: 4573036 (1986-02-01), Wondra
patent: 4590456 (1986-05-01), Burton et al.
patent: 4644325 (1987-02-01), Miller
patent: 4683458 (1987-07-01), Hallgreen
patent: 4725813 (1988-02-01), Miyada
patent: 4751497 (1988-06-01), Torii
Analog Devices Incorporated
Pellinen A. D.
Williams H. L.
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