| 위성 DAB 수신을 위한 저잡음 증폭기의 설계 및 구현에 관한 연구 |
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전중성, 유재환 |
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| A Study on Design and Implementation of Low Noise Amplifier for Satellite Digital Audio Broadcasting Receiver |
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Joong Sung Jeon, Jae Hwan You |
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| Abstract |
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In this paper, a LNA(Low Noise Amplifier) has been developed, which is operating at L-band i.e, 1452~1492 ㎒ for satellite DAB(Digital Audio Broadcasting) receiver. The LNA is designed to improve input and output reflection coefficient and VSWR(Voltage Standing Wave Ratio) by balanced amplifier.
The LNA consists of low noise amplification stage and gain amplification stage, which make a using of GaAs FET ATF-10136 and VNA-25 respectively, and is fabricated by hybrid method.
To supply most suitable voltage and current, active bias circuit is designed. Active biasing offers the advantage that variations in Vpand Ipss will not necessitate a change in either the source or drain resistor value for a given bias condition. The active bias network automatically sets Vgs for the desired drain voltage and drain current.
The LNA is fabricated on FR-4 substrate with RF circuit and bias circuit, and integrated in aluminum housing. As a reults, the characteristics of the LNA implemented more than 32 ㏈ in gain. 0.2 ㏈ in gain flatness, lower than 0.95 ㏈ in noise figure, 1.28 and 1.43 each input and output VSWR, and -13 ㏈m in P1㏈. |
| Key Words:
DAB(Digital Audio Broadcasting);LNA;Active Bias;Resistive Decoupling Circuit |
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