의사 차동 병합 커패시터 스위칭 디지털-아날로그 변환기
조영균, 남재원, 권종기, 전영득
- 8059022 (2011.11.15)
09MB2100, 45nm급 혼성 SoC용 아날로그 회로기술,
- 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.
- KSP 제안 키워드
- Analog Converter, High-resolution, Output Voltage, Small area, bias voltage, coupling capacitor, digital-to-analog(DAC), digital-to-analog converters, reference voltage, unit capacitor