| DTV 중계기에서의 UHF 전송장치용 구동증폭단의 구현 및 성능평가에 관한 연구 |
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이영섭, 전중성 |
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| A Study on Fabrication and Performance Evaluation of a Driving Amplifier Stage for UHF Transmitter in Digital TV Repeater |
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Young-Sub Lee, Joong-Sung Jeon |
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| Abstract |
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In this paper, a driving amplifier stage with 1 Watt output has been designed and fabricated, which is operating at UHF band(470~806 ㎒) 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 ㎜ thickness. When the driving amplifier stage is flown by bias voltage of 28 V DC and current of 900 ㎃, it has the gain of more than 53.5 ㏈, the gain flatness of ±0.5 ㏈ and return loss of less than -12 ㏈ in 470 ~ 806 ㎒. Also, when two signals at 2 ㎒ 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 ㏈c. |
| Key Words:
DTV 중계기;1 Watt 단위증폭기;
Digital TV Repeater;Driving amplifier stage;preamplifier;1 Watt unit amplifier;Intermodulation distortion |
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