Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1987-10-05
1988-11-08
Shoop, Jr., William M.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
H03M 106
Patent
active
047836431
ABSTRACT:
An impedance transforming circuit for multibit digital word signals includes plural transmission paths for respective signals of a word. At least some of the paths have different output impedances but present essentially the same signal propagation delay. Each path includes plural, tandem connected, transistor switches; and each switch comprises, with correspondingly located switches of other paths, a stage of the transforming circuit. Output conductances of the switches of a path are scaled along the path according to a stage-to-stage ration F selected to minimize the number of stages required to achieve a desired signal propagation time through the path. At any stage switch where the ratio F cannot be directly accommodated, the selected value of F is achieved by dividing the stage output conductance between an in-path switch, that satisfies that ratio F with respect to a driven stage and a dummy-load switch that, together with the in-path switch, satisfies the ratio F with respect to a prior stage switch.
Blum Richard K.
Corwin S. C.
GE Company
Morris B. E.
Schanzer H. I.
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