應用在TDMA功率放大器之射頻功率偵測器

TDMA系統例如GSM850 / GSM900 / DCS1800 / PCS1900 行動電話網路已遍佈全世界。關鍵工作是在設計一個能準確控制傳送射頻功率的系統。其中的一種方法是使用射頻功率偵測器量測在天線端的射頻功率，利用此射頻功率偵測器將對數射頻功率信號轉換成相對應直流的電壓。然後運用　一個增益控制系統來校準放大器射頻功率，如此獲得最佳的通訊條件。這篇研究是使用 0.25um CMOS 製程為TDMA GSM系統實現一個射頻功率偵測的方法。其輸入是一個單端輸入，輸出信號亦是單端輸出。GSM 射頻功率信號是從824 ~849MHz，880 ~915MHz，1710 ~1785MHz，1850 ~191MHz頻率範圍，另外系統至少要有50 dB的動態功率操作範圍。輸出信號是一個正比於對數射頻功率 (dBm) 的直流電壓。與理想對數曲線最大差小於1dB。對溫度的最大的變化量亦小於1dB。

關鍵字

功率放大器；功率偵測器

並列摘要

TDMA systems have been covered the whole world， e.g. the GSM850/GSM900/GSM1800/GSM1900 cellular phone network. One key task is the design of a circuitry for accurate control of transmit power. One method for RF power control in a mobile communications handset is to use a power detector to measure the RF power at the antenna during transmit and produce a voltage that corresponds to the logarithmic of the power. A gain control system may then adjust the amplifier stages to obtain optimal communication conditions. The task of this thesis was to implement a RF power detector for TDMA system in a 0.25 um CMOS process. The input is a single-ended， GSM RF signal is a frequencies ranging from 824~849MHz， 880~915MHz， 1710~1785MHz， 1850~191MHz， with a dynamic range of –36 t0 20dBm. The output signal is a single-ended voltage being proportional to the applied input power in dBm. Maximum deviation of the ideal logarithmic curve should be no more than 1dB. Maximum variation between 25℃ and –10/55℃ should be no more than 1dB.

並列關鍵字

Power Amplifier ； Power Detector

參考文獻

[3] Analog Devices， AD83 14 data sheet (2GHz RSSI)

[4] Yijun Zhou and Michael Chia Yan Wah，” A Wide Band CMOS RF Power Detector”

[6] Baker, Li, Boyce, “CMOS. Circuit Design, Layout and Simulation”

[7] Thomas H. Lee., ”The design of CMOS radio-frequency integrated circuits”

[1] Stacy Ho， "A 450MHz CMOS RF Power Detector，" IEEE Radio Frequency Integrated Circuits Symposium 2001. Digest of Papers, pp.209-212.

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應用在TDMA功率放大器之射頻功率偵測器

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