Ku-band Dielectric Resonator Phase-locked Loop Frequency Source Design

Frequency synthesizing is the key technique to realize a good performance electronic system. A frequency synthesizer with very good performance can be designed using PLL. By using SPLL,a better synthesizer with lower phase noise can be realized. Dielectric resonator (DR) is often used to stabilize the frequency of an oscillator. DR is made of microwave ceramic with high dielectric constant and very low loss. Using DR, the phase noise of an oscillator could be made to be extremely low. At the same time the temperature coefficient of a DR could be positive or negative, and this may be used to compensate for the frequency drift due to temperature shift. In this paper,a Ku band frequency source based on sampling phase lock loop technique is introduced. The VCO of the loop is designed using dielectric resonator. The theory and design method is discussed and emphasized on. The resonance network is connected to the gate, then the output and input matching network is designed to satisfy the oscillation criteria. Then harmonic balance method is used to analysize and optimize the output power and phase noise. To minimize the load pulling effect a buffer amplifier is designed to isolate the oscillator and the load. In the design of the SPLL, SRD takes the input of a crystal oscillator and generate very sharp and narrow pulses. The frequency of the pulse is the same as that of the crystal oscillator. The pulses sampled the output of the VCO and generate the error signal. The error signal is amplified,...