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EDSM 송신기를 위한 20-MHz 대역폭, 1.5-비트 연속시간 델타-시그마 모듈레이터
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- Issue Date
- 2012-06
- Citation
- 대한전자공학회 종합 학술 대회 (하계) 2012, pp.403-406
- Publisher
- 대한전자공학회
- Language
- Korean
- Type
- Conference Paper
- Abstract
- A 1.5-bit 20-MHz bandwidth continuous-time delta-sigma modulator (CTDSM), which is suitable for envelop delta-sigma modulation (EDSM) transmitters, is presented. To compensate the process-voltage-temperature variation, a resistor calibration method is proposed. The proposed calibration scheme improves a signal to quantization noise ratio (SQNR) by 18%. The switched capacitor digital-to-analog converter (DAC) and tri-level output DAC are adopted to improve non-ideal effects and implement multi-level encoding, respectively. Over 44 dB SQNR has been achieved for corner simulation conditions. The power consumption of the modulator is 12.9 mW from the 1.2 V supply. 1.74 % of error vector magnitude can be obtained for a 20 MHz LTE signal with a 9.7 dB peak-to-average power ratio.
- KSP Keywords
- Calibration method, Continuous-time delta-sigma modulator, Delta-Sigma Modulation, Digital-To-Analog converter, MHz bandwidth, Multi-level, Non-ideal, Peak-to-Average-Power-Ratio(PAPR), Power Consumption, Signal to Quantization Noise Ratio, Switched Capacitor(SC)