CMOS digital to analog signal converter circuit

Details CMOS digital to analog signal converter circuit CMOS digital to analog signal converter circuit

1989-12-15

1992-09-15

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

With particular solid state devices

341133, 323289, 330253, 330259, 330264, H03K 19017, H03K 19094

Patent

active

051481650

ABSTRACT:
A digital to analog converter comprising a differential amplifier formed of a pair of similar conductivity type field effect transistors, one transistor being connected to a load for driving the load in synchronism with a digital input signal, means for applying a reference voltage to the gate of the second transistor, and a third field effect transistor of conductivity type complementary to said one transistor, connected with its source-drain circuit in series with the source-drain circuit of the second transistor to a second reference voltage, and means for driving the gates of said one and third transistors together with said digital input signal, whereby the first and third transistors are synchronously and oppositely driven to conduct and cut off, thus ensuring substantially no current flow in the second transistor while the first transistor is conducting.

REFERENCES:
patent: 3697852 (1972-10-01), Gerbitz
patent: 4484148 (1984-11-01), Wieser et al.
patent: 4635038 (1987-01-01), Wincn
patent: 4774497 (1988-09-01), Taylor
patent: 4800365 (1989-01-01), White et al.
patent: 4958133 (1990-09-01), Bazes
Application of Transistor Emitter-Open Turn-Off Scheme to High Voltage Power Inverters; IEEE; Jun. 29-Jul. 3, 1981; pp. 252-257.
A 300kHz Off-Line Switching Supply Using a Unique Bi-MOS Switch Combination; Power Conversion Int'l; Farrow & Taylor; Sep./Oct. 1980; pp. 20-27.

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