Body-Injection Locked Ku-band RF Frequency Divider

• Main Authors: JHENG-WEI WU, 吳政緯
• Other Authors: JANNE-WHA WU
• Format: Others
• Language: en_US
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/62881915719436394484

碩士 === 國立中正大學 === 電機工程研究所 === 103 === The study of this thesis focuses on the design of injection-locked frequency divider used in the phase lock loop of the wireless transceiver. All the proposed circuits are implemented by TSMC 0.18μm 1P6M CMOS process. Two divide-by-three frequency dividers are proposed for Ku-band application. Based on the formulation of locking range, the enhancement of injection signal makes the locking range wider. Following this concept, this thesis demonstrates frequency divider with wide-locking range by using body injection to enhance the strength of injection signal. The first proposed topology, a body-injection-locked frequency divider by three including two cross-coupled pairs and body injection is demonstrated. Locking range of the proposed ILFD is enhanced by injecting the signal into the body of cross-coupled pair. By this method, the ILFD can consumes low power consumption with wide locking range. The measured operation range is from 10.92 GHz to 13.47 GHz (21%) with an injection power of 0 dBm. The measured maximum locking range is from 13.11 GHz to 13.47 GHz (2.7%) with an injection power of 0 dBm when bias voltage Vtune is 0 V. The power consumption of the core circuit takes 6.5 mW from a 1.2V power supply. Another proposed circuitry, a body-injection-locked frequency divider by three with body injection and direct injection is demonstrated. Based on direct injection, a second harmonic signal created by the push-push oscillator and input signal are injected to the body of direct injection transistor at the same time. The locking range can be intensified significantly by this technique. The measured operation range is from 11.7 GHz to 15.77 GHz (29.6%) with an injection power of 0dBm. The measured maximum locking range is from 14.99 GHz to 15.77 GHz (5.07%) with an injection power of 0 dBm when bias voltage Vtune is 2 V. The power consumption of the core circuit takes 5.85 mW from a 1.2V power supply. Furthermore, phase noise with respect to the external injection signal is discussed. The relationship between locking range, injection power, and frequency offset is clarified by the measured results.