Digital-to-analog converter with low skew and glitch

Details Digital-to-analog converter with low skew and glitch Digital-to-analog converter with low skew and glitch

2005-06-07

2005-06-07

Jeanglaude, Jean Bruner (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

With particular solid state devices

C341S144000

Reexamination Certificate

active

06903671

ABSTRACT:
Disclosed is a digital-to-analog (D/A) converter with low skew and glitches. The D/A converter has current cells each outputting a different current amount and current switches selectively enabling the current cells, and obtains an analog signal from voltages corresponding to output currents of the current cells by operating the current switches, characterized in that the current switches are each provided with MOS transistors each having an adjusted aspect ratio so as to have a constant capacitance load regardless of the output current amounts from the current cells. In such a D/A converter, parasitic capacitances of MOS transistors provided in the current switches are adjusted constant regardless of output current amounts, so that the D/A converter can operate at a high speed with low skew and glitch.

REFERENCES:
patent: 6218974 (2001-04-01), Dedic
patent: 6344816 (2002-02-01), Dedic
patent: RE37619 (2002-04-01), Mercer et al.
patent: 6369734 (2002-04-01), Volk
patent: 6417793 (2002-07-01), Bugeja et al.
patent: 6496132 (2002-12-01), Volk
patent: 6639534 (2003-10-01), Khoini-Poorfard et al.

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