RF 고출력증폭기 전원시스템 설계 및 구현

Abstract

본 논문은 능동배열 레이더 송수신기에 적용되는 RF 고출력증폭기 구동을 위한 전원시스템의 설계 및 구현에 관한 것이다. RF 고출력증폭기의 안정된 성능을 충족하기 위한 직류 전원은 높은 안정도가 요구되고, 발생되는 노이즈를 최대한 저감할 수 있는 방안이 필요하다.[1] 따라서 이러한 요구사항을 만족할 수 있는 전원시스템을 설계하였다. 전원시스템은, 인덕터를 이용해 입력 전류 리플을 최소화시키기 위한 입력필터부, 송수신 구간과 동기하여 RF 고출력증폭기의 공급 전원을 절체하는 동기절체부, 송신용 에너지 저장을 위한 Capacitor Bank부 그리고 RF 고출력증폭기의 안정적인 Off 시퀀스를 위한 전원방전부로 구성된다. 위 4개의 블록으로 구성되는 전원시스템을 제작하였고, 실험을 통하여 RF 고출력증폭기 직류전원에 대한 5가지 요구 규격인 1) 1kHz부터 50kHz까지의 송수신 주파수에 대한 안정적 동작, 2) 송신 펄스간 3mV이하의 전압 차, 3) 2A 이하의 충전 전류, 4) 송신 시 1.5V 이내의 전압 강하, 5) 충전 및 방전 전류의 overlap 금지의 조건을 만족함을 확인함으로써 설계의 타당성을 입증하였다.|This paper discusses the design and implementation of the power system for a RF high power amplifier which can be applied to an active array radar transceiver. In order to stable performance of the RF highpower amplifiers, the DC power system to the amplifier should have a stable operation and the noise reduction should be as much as possible. Therefore, to satisfy these requirements the power system should be designed.

The power system to the amplifier was designed and it consists of four main circuit blocks: the input filter part including inductor that minimize the input current ripple, synchronous switchover part that switch over the

power supply for the RF high-power amplifier synchronizing to TX/RX period, capacitor bank to store transmit energy, and power discharge part for stable off sequence of the RF high power amplifier.

The designed power system with four circuit blocks were built. And it was confirmed the following five regulations to the RF high power amplifier were passed through the experiment: 1) stable operation for TX/RX frequencies from 1 kHz to 50 kHz, 2) voltage difference between transmitted pulses should be less than 3mV, 3) charging current should be less than 2A, 4) voltage drop should be less than 1.5 volts during the transmission period, 5) prohibition of charging and discharging current overlap.

Finally, from the above results it was proved the design of the power system for the RF high-power ampli; This paper discusses the design and implementation of the power system for a RF high power amplifier which can be applied to an active array radar transceiver. In order to stable performance of the RF highpower amplifiers, the DC power system to the amplifier should have a stable operation and the noise reduction should be as much as possible. Therefore, to satisfy these requirements the power system should be designed.

The power system to the amplifier was designed and it consists of four main circuit blocks: the input filter part including inductor that minimize the input current ripple, synchronous switchover part that switch over the

power supply for the RF high-power amplifier synchronizing to TX/RX period, capacitor bank to store transmit energy, and power discharge part for stable off sequence of the RF high power amplifier.

The designed power system with four circuit blocks were built. And it was confirmed the following five regulations to the RF high power amplifier were passed through the experiment: 1) stable operation for TX/RX frequencies from 1 kHz to 50 kHz, 2) voltage difference between transmitted pulses should be less than 3mV, 3) charging current should be less than 2A, 4) voltage drop should be less than 1.5 volts during the transmission period, 5) prohibition of charging and discharging current overlap.

Finally, from the above results it was proved the design of the power system for the RF high-power ampli