標題: A 20MHz Low Dropout Controlled Current Sensor for Constant On-Time Based Envelop Tacking Supply Modulator for Radio Frequency Power Amplifier
作者: Lin, Wei-Ting
Lin, Zong-Yi
Liu, Chia-Hao
Chen, Ke-Horng
Lin, Ying-Hsi
Lin, Jian-Ru
Tsai, Tsung-Yen
交大名義發表
National Chiao Tung University
關鍵字: Envelope tracking;switching regulator (SWR) with capacitor multiplier;low dropout (LDO)-controlled current sensor
公開日期: 1-Jan-2018
摘要: this paper presents a LDO-controlled current sensor for accelerating constant on-time (COT) switching regulators (SWRs) for high efficiency envelope tracking power modulators (ETSMs) for RF power amplifiers (RF PAs). The proposed LDO-controlled current sensor controls the feedback loop of the SWR, rather than the traditional current sensing technique, in the case of fast envelope tracking. The LDO regulator behaves as the master to rapidly trigger the SWR as a slave energy provider to rapidly deliver the average energy to the RF PA for high efficiency. The experimental results show that the test chip fabricated in 0.18 mu m CMOS process can accurately track the RF envelope signal, and the peak efficiency is 86.7% when the power is 0.95W.
URI: http://hdl.handle.net/11536/150863
ISSN: 0271-4302
期刊: 2018 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (ISCAS)
Appears in Collections:Conferences Paper