A 5-6-GHz bipolar quadrature-phase Generator

A wide-band fully monolithic quadrature-phase generator is implemented. It consists of a bipolar frequency doubler with differential outputs and a regenerative divider with 5 mV/sub rms/ maximum sensitivity. Measured residual phase noise is </spl plusmn/0.5 dB for offsets between 100 Hz and 100 kHz in the 5-6-GHz band, limited by the resolution of the measurement equipment. An electronic phase tuning circuit controls the I/Q phase error to /spl plusmn/15/spl deg/ of tuning range with 0.033/spl deg//mV sensitivity. Unwanted harmonics are suppressed by over 40 dB within the working range of the multiplier. The test circuit occupies an active area of 0.26/spl times/0.11 mm/sup 2/, and consumes 23 mW from a 2.7-V supply.

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