Coded data generation or conversion – Analog to or from digital conversion – With particular solid state devices
Patent
1995-09-21
1997-11-18
Gaffin, Jeffrey A.
Coded data generation or conversion
Analog to or from digital conversion
With particular solid state devices
341144, H03M 166
Patent
active
056892586
ABSTRACT:
A digital-analog converter has unit current source cells each having a differential switch circuit and a constant current source. The differential switch circuit made of two switches is driven by a pair of complementary driving circuits controlled by a bit signal and the inverted bit signal corresponding to that signal and entered simultaneously. The constant current source outputs a constant current to a first and a second current output terminal via the switch circuit. The signals for controlling the driving circuits that drive the switches are such that the delay time for the switch closing operation will be longer than the delay time for the switch opening operation. As a result, the cross point of the two signals to open and close the switches in a complementary manner becomes greater than the median between the maximum and minimum signal levels. That is, even when the threshold value of a currently switching transistor is greater than a median, that value may be arranged to match the median, whereby the furnished switching transistors are not turned on or off simultaneously.
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Kouno Hiroyuki
Miki Takahiro
Nakamura Yasuyuki
Gaffin Jeffrey A.
Huynh Thuy-Trang N.
Mitsubishi Denki & Kabushiki Kaisha
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