Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Reexamination Certificate
2006-02-21
2006-02-21
Jeanpierre, Peguy (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
C341S145000
Reexamination Certificate
active
07002500
ABSTRACT:
A circuit, apparatus and method for efficiently and accurately calibrating an output driver current are provided in embodiments of the present invention. In an embodiment of the present invention, a circuit comprises a first digital-to-analog converter (“DAC”) that generates a first current. A first transistor is coupled to the first DAC and generates a first biasing current responsive to the first current. A second DAC is coupled to the first transistor and generates a first control current responsive to the first biasing current. According to an embodiment of the present invention, the first and second DACs are binary weighted control DACs. According to an embodiment of the present invention, the binary weighted values of the second DAC are obtained in response to a calibration signal generated by a controller. According to an embodiment of the present invention, the first DAC is an M-bit DAC and the second DAC is an N-bit DAC, wherein M is less than N. According to an embodiment of the present invention, the circuit is in a memory device and a controller generates calibration signals.
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Jeanpierre Peguy
Lauture Joseph
Rambus Inc.
Vierra Magen Marcus Harmon & DeNiro LLP
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