Abstract
The trade off between phase noise and quadrature accuracy, typical of coupled voltage controlled oscillators, is broken if injection locking dividers are used for I and Q generation. Based on the general behavioral modeling of regenerative frequency dividers, this paper derives analytical expressions for locking band and phase deviation from quadrature. An injection locking quadrature generator, embedded in a 0.18 /spl mu/m CMOS direct conversion receiver, shows 24% frequency locking range while drawing 4 mA. The phase deviation from quadrature measured on down-converted signals is 0.8/spl deg/.
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