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http://dx.doi.org/10.5394/KINPR.2003.27.5.505

A Study on Fabrication and Performance Evaluation of a Driving Amplifier Stage for UHF Transmitter in Digital TV Repeater  

Lee, Young-Sub (System Engineering Department, SARACOM Co., Ltd.)
Jeon, Joong-Sung (Research Institute of Industry Technology, Korea Maritime University)
Publication Information
Journal of Navigation and Port Research / v.27, no.5, 2003 , pp. 505-511 More about this Journal
Abstract
In this paper, a driving amplifier stage with 1 Watt output has been designed and fabricated, which is operating at UHF band( 470 ∼ 806 MHz) for digital TV repeater. In the driving amplifier stage, preamplifier and 1 Watt unit amplifier are integrated by one electric substrate which is 2.53 in dielectric constant and 0.8 mm thickness. When the driving amplifier stage is flown by bias voltage of 28 V DC and current of 900 mA. it has the gain of more than 53.5 dB. the gain flatness of $\pm$0.5 dB and return loss of less than -15 dB in 470 ∼ 806 MHz. Also, when two signals at 2 MHz frequency interval are input port into the driving amplifier stage with 1 Watt output, it resulted in excellent characteristics to designed specification with showing intermodulation distortion characteristics of more than 48 dBc.
Keywords
Digital TV Repeater; Driving amplifier stage; preamplifier; 1 Watt unit amplifier; Intermodulation distortion;
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