Coded data generation or conversion – Analog to or from digital conversion – With particular solid state devices
Patent
1990-06-11
1991-03-19
Shoop, Jr., William M.
Coded data generation or conversion
Analog to or from digital conversion
With particular solid state devices
341119, 341133, 341135, 330288, H03M 100, H03F 304
Patent
active
050014820
ABSTRACT:
A digital-to-analog converter for use in a timing control loop. The converter includes a plurality of cells, each activated in response to a timing loop control signal. The converter also includes a resistive current mirror, with a first resistance R1, providing a reference curent which is mirrored in each cell by a current source FET. Each cell is constructed to switch the current from its current source FET through an output FET when a respective control bit provided to the cell is positive. Otherwise, the current is diverted through a sink FET. All of the cell output FETs are tied to a single resistance R2 which collects the currents of the active cells and provides the AC output of the converter. The converter's output is related only to the ratio R2/R1, thereby decoupling process, temperature, and voltage effects from the output of the converter.
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Chung Paul W. S.
Lowrie David S.
Saber Paik
Wang Chorng K.
International Business Machines - Corporation
Kim Helen
Shoop Jr. William M.
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