A subharmonically-injected quadrature LO generator for 17GHz WLAN applications
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An injection-locked oscillator multiplies a 5-6 GHz input by 3 to generate I/Q LO signals for 17 GHz HiperLINK applications. Symmetrical injection via a polyphase prefilter minimizes I/Q errors. LC delay lines set the measured free-running frequency to 16.24 GHz with a locking range of 14.6-17.86 GHz for a 0 dBm (50 /spl Omega/) input. Input-to-output phase noise degradation is negligible, and I/Q amplitude and phase errors are <0.17 dB and <2/spl deg/, respectively. Power consumption of the 1.2/spl times/1.4mm/sup 2/ 0.2 /spl mu/m SiGe BiCMOS test chip (excluding buffers) is 22 mW at 2.2 V.
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