| Title |
Voltage-controlled-oscillator based Continuous-time Sigma-delta Modulator Analog-to-digital Converter |
| Authors |
정동혁(ok Jeong) ; 유창식(Changsik Yoo) |
| DOI |
https://doi.org/10.5573/ieie.2021.58.4.32 |
| Keywords |
Analog-to-digital converter (ADC); Continuous-time sigma-delta modulator (CT-SDM); Voltage- controlled-oscillator (VCO); CMOS scaling |
| Abstract |
Implementing a continuous-time sigma delta modulator based on a voltage-controlled oscillator can gain certain advantages as the semiconductor process develop. This is because the voltage-controlled oscillator is basically implemented based on an inverter, and its speed increases with the development of semiconductor processes. In addition, since the voltage-controlled oscillator operates in the time domain, there is an advantage of maintaining a sufficiently wide dynamic range even when the operating voltage range according to process development is lowered. These advantages can be attractive enough to implement a continuous-time sigma-delta modulator analog-to-digital converter based on a voltage controlled oscillator. In this paper, a continuous time sigma-delta modulator analog-to-digital converter based on a voltage-controlled oscillator is implemented using a 28nm CMOS process model. Trough behavioral modeling simulation, it has a bandwidth of 80MHz and a signal-to-noise and distortion ratio (SNDR) is 70.0dB using a 1.6GHz sampling clock. |