Digital to analog conversion

Details Digital to analog conversion Digital to analog conversion

2006-08-29

2006-08-29

Young, Brian (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S136000

Reexamination Certificate

active

07098829

ABSTRACT:
A unit cell for a digital to analog conversion circuit that includes a current source (CS); a first data switch (S1) coupled to the current source (CS); a second data switch (S2) coupled to the current source (CS); a first phase switch (Phi1) coupled between the current source (CS) and the first data switch (S1); a second phase switch (Phi2) coupled between the current source (CS) and the second data switch (S2); a controller arranged to switch between the first (Phi1) and second (Phi2) phase switches in a Break Before Make alternating sequence, and to switch the first (S1) and second (S2) data switches in a Make Before Break sequence. A digital to analog convener circuit constructed using unit cells according to the invention is more area and power efficient than the previously known circuit because it uses only one current source, yet it succeeds in preventing short-circuit error currents between the outputs and solves the problems caused by pulse asymmetry and the influence of switch-charge injection, and provides more linear and better quality output signals.

REFERENCES:
patent: 5008671 (1991-04-01), Tuthill
patent: 5059977 (1991-10-01), Herman
patent: 5254994 (1993-10-01), Takakura et al.
patent: 6844835 (2005-01-01), Kao

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