상세정보
학술대회
20-MHz Bandwidth Continuous-Time Delta-Sigma Modulator for EPWM Transmitter
- 발행일
- 201208
- 출처
- International Symposium on Wireless Communication Systems (ISWCS) 2012, pp.885-889
- 협약과제
- 12MI1300, 차세대 이동통신 기지국용 Class-S 전력증폭기 기술 연구, 정재호
- 초록
- A 1.5-bit 20-MHz bandwidth continuous-time delta-sigma modulator (CT-DSM), which is suitable for envelope pulse-width modulation (EPWM) 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 all corner simulation condition with an oversampling ratio of 13.056 and 20-MHz of bandwidth. The power consumption of the modulator is 11.6 mW from the 1.08 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. © 2012 IEEE.
- KSP 제안 키워드
- Calibration method, Continuous-time delta-sigma modulator, Digital to Analog Converter, MHz bandwidth, Multi-level, Non-ideal, Oversampling ratio, Peak-to-Average-Power-Ratio(PAPR), Power Consumption, Switched Capacitor(SC), Temperature variations