Digital-to-analog converter

Details Digital-to-analog converter Digital-to-analog converter

2010-05-04

2011-11-15

Jeanglaude, Jean (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S155000, C341S144000, C341S172000

Reexamination Certificate

active

08059022

ABSTRACT:
A digital-to-analog converter (DAC) is provided. The DAC includes a positive converter, a negative converter, and a comparator for receiving outputs of the positive converter and the negative converter, comparing the outputs with a reference voltage, and generating an output voltage. Each of the positive converter and the negative converter includes an upper-bit converter including a plurality of bit capacitors corresponding to respective upper bits, a lower-bit converter including a plurality of bit capacitors corresponding to respective lower bits, and a coupling capacitor for connecting the upper-bit converter with the lower-bit converter in series. Each of the positive converter and the negative converter receives a bias voltage to have a uniform offset when converting the respective bits. Accordingly, it is possible to obtain a high resolution using a small area. Also, the number of capacitors can be reduced, and the capacitance of a unit capacitor can be maximized. Consequently, it is possible to minimize heat noise and device mismatching.

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