密码: 123456
Thomas H Lee - THE DESIGN OF LOW NOISE OSCILLATORS
It is hardly a revelation to note that wireless and mobile communications have grown
tremendously during the last few years. This growth has placed stringent requirements
on channel spacing and, by implication, on the phase noise of oscillators. Compounding
the challenge has been a recent drive toward implementations of
transceivers in CMOS, whose inferior 1/f noise performance has usually been thought
to disqualify it from use in all but the lowest-performance oscillators.
Low noise oscillators are also highly desired in the digital world, of course. The continued
drive toward higher clock frequencies translates into a demand for everdecreasing
jitter.
Clearly, there is a need for a deep understanding of the fundamental mechanisms governing
the process by which device, substrate, and supply noise turn into jitter and
phase noise. Existing models generally offer only qualitative insights, however, and it
has not always been clear why they are not quantitatively correct....
