주입동기 기술을 이용한 고속도약주파수합성기 및 저전력 무선통신시스템 = Fast-hopping frequency synthesizer and low-power wireless communication system using injection locking technique

다국어 초록 (Multilingual Abstract)

In this dissertation, a fast-hopping frequency synthesizer using subharmonic injection locked oscillator and low-power wireless system using super-regeneration technique are investigated. A low-power wireless system for performing a local wireless communication using a predetermined frequency band divided into a plurality of channels and an adaptive channel selection sensor based on the spectrum cognition are investigated. A super-regenerative receiver (SRR) structure with channel selectable super-regenerative oscillator (SRO) is utilized as an adaptive channel selection sensor. The proposed sensor has been designed at the 2.4 GHz ISM band. System evaluation is performed with 100MHz frequency band divided by 10 channels (10MHz channel spacing) and the data rate of 50 Kbps. Measured Rx. sensitivity of the sensor is -80 dBm and the power consumption of the sensor is less than 1.2 Watt.
The proposed synthesizer employs a third-order subharmonic injection locked oscillator generated by the direct digital frequency synthesizer (DDS). A system shows that the locking range is about 870 MHz with an injection power of 15 dBm and a fast locking time of 115 nsec with a wide locking range and a reduction of reference source spurs at the locked oscillator output. In addition, it has a low phase noise of -119.6 dBc/Hz at 100 kHz offset and a low consumption power of 31 mW. This architecture may be helpful to design a high performance synthesizer for radio communication applications.

목차 (Table of Contents)

• Abstract i
• 목차 ii
• 그림 목차 iv
• 표 목차 vi
• 제 1장 서 론 1
• 제 2장 주입동기발진기(Injection-Locked Oscillator) 5
• 2.1 기본적인 이론 6
• 2.2 주입동기의 수학적 모델 8
• 2.2.1 Adlers 모델 9
• 2.3 부고조파 주입동기발진기(Subharmonic ILO) 14
• 2.4 응용 분야 20
• 제 3장 부고조파 주입동기발진기를 이용한 고속도약 주파수합성기 24
• 3.1 고속도약 주파수합성기의 설계 25
• 3.1.1 Direct Digital Synthesizer(DDS)의 구조 25
• 3.1.2 부고조파 주입동기발진기 설계 27
• 3.2 고속도약 주파수 합성기의 측정결과 29
• 제 4장 저전력 무선통신 시스템 설계 33
• 4.1 Super-Regenerative Receiver (SRR) 33
• 4.1.1 SRR의 기본 구조 33
• 4.2 적응형 채널선택센서(Adaptive Channel Selective Sensor) 42
• 4.2.1 주파수 가변형Super-Regenerative Oscillator (SRO) 설계 45
• 4.2.2 전체적인SRR의 설계 53
• 4.2.3 SRR 측정결과 55
• 4.2.4 SRR을 이용한 센서의 채널선택 평가 58
• 4.3 BER(Bit Error Ratio) 테스트 보드 설계 65
• 4.3.1 BER(Bit Error Ratio) 성능 평가 68
• 제 5장 결 론 69
• 참 고 문 헌 70