Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Reexamination Certificate
2008-07-29
2008-07-29
JeanPierre, Peguy (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
C341S118000
Reexamination Certificate
active
11178993
ABSTRACT:
A novel method and apparatus for a negative contributive offset compensation mechanism for a transmit buffer adapted to compensate for the positive offset generated by higher order sigma-delta modulators used to amplitude modulate the transmit buffer. The positive outputs from the sigma-delta modulator are processed differently than the negative outputs. The inverters associated with the negative outputs in the sigma-delta modulator are removed and the clock signal used to drive the transistors corresponding to the negative outputs is negated or shifted 180 degrees from the clock used to drive the transistors corresponding to the positive outputs. A non-inverted version of the clock is used with the positive outputs and an inverse clock is used with the negative outputs. Use of the inverse clock causes a negative contributive offset to be generated that is added on the second half cycle of each clock. The result is an offset compensated RF output signal having zero offset.
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Hung Chih-Ming
Leipold Dirk
Rezeq Sameh S.
Staszewski Robert B.
Brady III Wade James
Jean-Pierre Peguy
Neerings Ronald O.
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