Piscataway: Institute of Electrical and Electronics Engineers
Abstract:
This paper presents a highly-integrated 3–8 GHz ultra-wideband (UWB) RF transmitter implemented in a 1.2 V 0.13- $mu$m CMOS technology. The transmitter integrates an analog baseband (PGAs and filter), an IQ modulator, a variable gain amplifier (VGA), a differential-to-single-ended amplifier, a power amplifier, as well as a transmitted signal strength indicator (TSSI). The RF VGA and the TSSI cooperate to perform an automatic transmit power control. The IQ modulator and an off-chip digital circuit implemented by a FPGA perform a carrier leakage calibration. Measured maximum output power and OP1 dB are $-$5 and $+$1.5 dBm, respectively. Measured worst carrier leakage suppression is 21 dB (before calibration) at 6.6 GHz. Measured worst sideband suppression is 29.1 dB at 7.6 GHz. The high linearity and accurate IQ modulation lead to an error vector magnitude (EVM) of $-$28 dB under the data rate of 480 Mb/s in WiMedia Mode 1. The entire transmitter consumes 66 mW under supply voltage of 1.2 V. 在此篇論文我們實現了一個應用於3-8 GHz 超寬頻(Ultra札Tideband， UWB) 無線通訊象統的射頻發射器(RF Transmitter)之急統與電路設計。此UWB 射頻發射器整合了類比基頻電路(基頻可變增益放大器與基頻濾波器)、I1Q 升頻調變器、射頻可變增益放大器、功率放大器與發射功率指標器(Transmit Signal Strength Indicator,TSSI) 。射頻可變增益放大器與TSSI 之協同工作實現了自動發射功率調整之功能O 射頻發射器亦搭配了數位輔助之載波洩漏校正電路(Carrier leakage Calibration) 。此射頻發射器俱有高調變精確度與高線性度。量測得到-5 dBm 之最大發射功率與+1.5 dBm 之輸出功率1 dB壓縮點(OP1dB)。在480 Mb/s 之資料傳輸速度下，可達到-28dB之Error Vector Magnitude (EVM) 。
Relation:
IEEE Transactions on Very Large Scale Integration (VLSI) Systems 20(8), pp.1357-1367
