D/A converter circuit having offset voltage application device

Details D/A converter circuit having offset voltage application device D/A converter circuit having offset voltage application device

1996-05-07

1998-10-06

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Increasing converter resolution

341144, 341118, H03M 120

Patent

active

058183728

ABSTRACT:
A D/A converter circuit has at least two multiple-bit type D/A converters connected in parallel with each other. The circuit also includes a random signal generation circuit that generates a random signal voltage having a voltage value that timewise, randomly changes at each sampling cycle. The random signal voltage is added to and subtracted from a digital signal to be inputted to the at least two D/A converters. As a result, offset voltages whose sum is zero are added to the digital signals to be inputted to the D/A converters. The signals are D/A converted by the plurality of D/A converters to provide analog outputs, which are then added together by an analog adder.

REFERENCES:
patent: 5148163 (1992-09-01), Frindle
patent: 5225835 (1993-07-01), Majima et al.

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