Nanjing Ticom Technology Company

Nanjing, China

Nanjing Ticom Technology Company

Nanjing, China
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Xu J.,Nanjing Southeast University | Yao Z.,Nanjing Southeast University | Zeng X.,Nanjing Southeast University | Wang R.,Nanjing Southeast University | And 3 more authors.
Gaojishu Tongxin/Chinese High Technology Letters | Year: 2014

The design, fabrication and test of a RF power amplifier module for the fiber repeater meeting the GSM-R (GSM for rail-way) standard were conducted. The technique of the power back-off combined with the technique of the pre-distortion and double-balanced output stage was applied to the design to achieve the high linearity. The automatic gain control (AGC) and the automatic level control (ALC) were used to ensure the stable output power and final gain of the amplifier. By adding the VSWR (voltage standing wave ratio) detection, control circuitry, etc., the reliability of the power amplifier module was guaranteed. The measurement results showed that the module achieved the output power of 16W, while the third-order intermodulation distortion (IMD3) was up to -63dBc. It showed the excellent linearity and stability, showing that it fully meets the requirements of high-speed rail railway GSM-R repeaters.


Xu J.,Nanjing Southeast University | Yu J.,Nanjing Southeast University | Zeng X.,Nanjing Southeast University | Wang Z.,Nanjing Southeast University | And 2 more authors.
Gaojishu Tongxin/Chinese High Technology Letters | Year: 2014

A low noise amplifier module meeting the railway GSM-R standard was designed, fabricated and tested for a GSM-R fiber optic repeater. The module used four stages of amplification to provide the high gain and linearity. The input stage adopted a double balanced structure. It not only improved the stage-stage matching performance, but also increased the reliability for its redundant backup function. The digit-analog hybrid auto-gain control technology was used to guarantee the output power stability and high dynamic range. The measurements results showed that the module achieved the maximum gain of up to 60dB, the gain adjustment range of greater than 30dB, the intermodulation attenuation of less than-60dBc, and the noise figure of less than 1.0dB. It exhibited the excellent linearity and noise performance. The module can fully meet the requirements of high-speed railway GSM-R repeaters. ©, 2014, Inst. of Scientific and Technical Information of China. All right reserved.

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