Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Reexamination Certificate
2006-09-05
2006-09-05
Barnie, Rexford (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
C341S143000, C341S144000, C341S155000, C341S172000
Reexamination Certificate
active
07102558
ABSTRACT:
A five-level feed-back digital-to-analog converter (DAC) in a switched capacitor sigma-delta analog-to-digital converter has an improved switching sequence that boosts from two to five the number of quantization levels of the feed-back DAC. Switching sequences are used to obtain five equally distributed charge levels C*VREF, C*VREF/2, 0, −C*VREF/2 and −C*VREF. When summed with an input voltage, VIN, the five-level feed-back DAC produces five equally distributed output voltages of A*VIN+VREF, A*VIN+VREF/2, A*VIN+0, A*VIN−VREF/2 and A*VIN−VREF, where A is gain, VINis the input voltage, and VREFis the reference voltage.
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Barnie Rexford
Microchip Technology Incorporated
Nguyen Khai
LandOfFree
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