Current source cell apparatus for digital/analog converter

Coded data generation or conversion – Analog to or from digital conversion – With particular solid state devices

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341144, H03M1/66

Patent

active

059054522

ABSTRACT:
An improved current source cell apparatus for a digital/analog converter which is capable of off-setting noises and obtaining a faster current switching by using different type current source cells which are alternately arranged, thus being well adaptable to a high frequency digital/analog converter. First current source cells receive a first bias voltage, a second bias voltage, and an inverted second voltage, respectively, and are enabled when the second bias voltage is a low level signal. A plurality of second current source cells are connected alternatingly with the first current source cells, and also receive the first bias voltage, the second bias voltage, and the inverted second bias voltage, respectively, and are enabled when the second bias voltage is a high level signal. A load resistor is commonly connected with the output terminals of the first and second current source cells through a common node, for thus obtaining an output voltage drop thereacross as an analog signal.

REFERENCES:
patent: 5162800 (1992-11-01), Ogawara
patent: 5760725 (1998-07-01), Yoshida et al.
Takahiro MIKI et al., "An 80 MHz 8-bit CMOS D/A Converter," Reprinted from IEEE J. Solid-State Circuits, vol. SC-21, No. 6, pp. 983-988, Dec. 1986.

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