Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Reexamination Certificate
2007-10-16
2007-10-16
Jeanglaude, Jean Bruner (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
C341S145000
Reexamination Certificate
active
11454595
ABSTRACT:
A string DAC having 2Mstring resistors includes a plurality of switches for selectively coupling, according to the decoding of an M-bit MSB subword, the voltage across a string resistor to an interpolation sub-DAC which interpolates it according to the decoding of an N-bit mid-subword. The voltage across the string resistor is multiplexed, according to the decoding of an N-bit mid-subword, to various inputs of 2Ndifferential transistor pairs of an interpolation amplifier. A P-bit delta sigma modulator produces a delta sigma modulated signal, according to a P-bit LSB subword, to control multiplexing of voltages on the terminals of the string resistor to an input of one of the differential transistor pairs selected by decoding of the N-bit mid-subword to monotonically average a contribution of the selected differential transistor pair to generation of an output voltage representing a word including the M-bit, N-bit, and P-bit subwords.
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Brady III Wade J.
Jeanglaude Jean Bruner
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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